Seal-Lock Fluid Weld - 8. Before the heads go into the oven, we chamfer the guide receiver holes with a hand deburring tool. The number along with the date code can be used to pinpoint the heads original application fairly closely. Intake & Exhaust Valves. I recommend that you replace all valves, valve seats and guides if the engine has 5,000 hours or . Grind the head of an old valve until it just slides down inside the valve seat. 590 exhaust valves. 60" exhaust) and whether or not screw-in studs and guideplates are in place can further ID. You may need to scrub a little to remove. All cylinder heads have a three angle valve cut with a blade type seat cutter. 6 3 Tap the extractor in with a hammer. This also applies to using a punch to drive the seat out or prying it out. After the coil is inserted you then bust off the tang. Jan 21, 2022 LS3 lightweight, hollow stem intake valves can be cut to fit the seats, and better valve springs are a necessity for high RPM. Cast and forged quarter-turn valves are available in a wide range of sizes and pressure classes. Follow all safety instructions in this guide, on the. Engine mounts are unique. After the coil is inserted you then bust off the tang. Removing the heads soon on my (mostly) stock 220k mile RT Magnum to fix my leaky head gasket and exhaust leak, and planning on having the heads cleaned up and decked while they are off. 50 valves. Youll need Center punch. Place a sharp, thin chisel in the outermost lip of the valve seat and tap the end of the chisel with a medium-size hammer. Bad Valve Seals Symptoms. 020" from OHC surfaces will result in 1 degree of advance in valve timing. This also applies to using a punch to drive the seat out or prying it out. Remove the cylinder head bolts and remove the cylinder head by rocking it with your hands. 051 mm (0. Based on the analysis, we determine the material used, considering the durometer (relative hardness) of the rubber, temperature requirements (both extreme heat and extreme cold), resistance to common oil types, tear-resistance and leak rate. Aluminum heads need to be heated up slightly. This also applies to using a punch to drive the seat out or prying it out. Under the Valve Covers of Darts New LS7-Style PRO1 Cylinder Heads Darts new line of LS7-compatible PRO1 heads package serious air flow with plenty of. True Pushrods are used to transmit motion from the lifters to the rocker arms. The coil replaces the original threads. The material is much harder than the head and takes the abuse of the valve contacting. Heat the screw head until. You can either use a seal pick to pop out whats left of the insert or you can make a third cut thats just deep enough to break through the insert material. Repeat the process as necessary to remove the hardened carbon deposits. Valve lift is a complex number, but it does impact airflow and is included in the spec sheet for many cylinder heads. Cast-iron Vortec cylinder head assembly for small-block. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. vl mq. Also, RTV can extrude out when the gasket is compressed, and it could end up in an oil or coolant passage and restrict or block flow. Special needs such as valve seat replacement and spark plug hole repair are no problem. It is quite simply cleaning via high-pressure surface blasting, but instead of dry abrasive media, it uses a slurry of water, compressed air, detergents and abrasive media. Spin the intake rocker nut down with the correct thickness feeler gauge inserted between the valve stem and the tip of the rocker arm. Though not a tool for removing seats, another piece of equipment that was introduced at the AERA show was a "Seat Ring Factory" by the K. Mar 1, 2015 Method two is the preferred racer&39;s technique - remove the old seats entirely and replace with a bigger, deeper seat. CALL NOW FOR YOUR MAKE AND MODEL (818) 767-6603. Lower the clear plastic with vent holes over the combustion chamber ensuring there is a water tight seal. Replacement of the cylinder head is commonly required to fix this problem. 807" Inner of the Inside Spring. This cut should just touch the stem-to-head radius, and remove the greatest amount of metal from the back of the valve head. As is common with the all alloy Jaguar V12 the heads were frozen in place due to chemical reaction between the steel head studs and the aluminium head castings. Insert the driver through the valve opening and drive out the guide towards the top of the cylinder head. Make sure that all retaining slips and hardware are removed from the top of the shaft where it attaches to the column, remove the column and then remove the gear box and shaft. Technician B says you must remove the camshafts last. Allow the solution to soak on the brushed nickel for a minute and then scrub the fixture with a nonabrasive scrubbing pad. All aluminum cylinder heads use a valve guide of a different. Image 6 Image 6 Insert the pin into the bleeders center and tap it downward as far as possible. 3) Lap in exhaust valves. Rinse the aluminum with water. 99 Compare. These are the most affordable high quality aluminum cylinder heads on the market. Upgrading LQ4LQ9 Cylinder Heads. For example, a faucet stem. If the cast iron head has integral seats it will need to be machined to replace the seat. Be very careful to avoid damaging the cylinder head. It may be necessary to knurl or replace the valve guides. Use a hack saw to saw vertically, against the threading of the metal where it connects to the hose. Here, the hand-held hammer and correct installation driver will do. From everything I have read I need these with the aluminum heads. Every time the exhaust valve closes, if it is red hot, it tends to "micro weld" itself to the seat. HO MANUAL. The tool is currently undergoing test evaluation and may soon be available. Knowing the secret password necessary to keep good seats in place while allowing the damaged heads to release is critical (of course, there is no password). Standard features are A-356 virgin aluminum alloy, phosphorous bronze valve guides, valve seats for use with unleaded fuel, ends milled and drilled for accessories, and a straight spark plug angle. In the hardening process, seats reach a temperature of 1700&176;F and are then allowed to air-cool. That is what makes the difference besides. Cutting New Valve Seats. The Yella Terra aluminum Holden 6 head is an affordable bolt on replacement head that will make more of an increase in power than any other bolt on hot up part. LS1 Mongoose - 15&176; Cylinder Head. BBC Magnum - 24&176; Cylinder Head. Choose a language. Intake & Exhaust Valves. Slide the valve. The tool is currently undergoing test evaluation and may soon be available. The material is much harder than the head and takes the abuse of the valve contacting. Every time the exhaust valve closes, if it is red hot, it tends to "micro weld" itself to the seat. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. Technician B says you must remove the camshafts last. The manifolds need to be removed from the head to do this correctly. After cutting the seat The next step is to cut the excess meat in the bowl left after cutting the bigger seat. Place a bead of grease around the circumference of the combustion chamber. casting, is pressure test. Before we describe all the steps that. Glass beads don't affect cast iron much,if at all. 125" Seats. 00 4 Cylinder 12 Valve Cylinder Head (aluminum). Throat cutting behind larger valves compliments the larger valves. The material is much harder than the head and takes the abuse of the valve contacting. Remove the valve seats. LA Small-Block Mopar Cylinder Head Casting Numbers. 50 Compare NEW Max Output II Drop in style Beehive Valve Spring Kit for Ford 351 Cleveland w Hyd Flat Tappets 229. Knowing the secret password necessary to keep good seats in place while allowing the damaged heads to release is critical (of course, there is no password). When the seat itself gets burned, you will never get good, long-lasting. RPO LS7 cylinder heads are 356-T6 aluminum with 70cc CNC ported combustion chambers, raised square port, CNC ported intake ports with 259cc runners, D-port, CNC ported exhaust with 86cc runners, 2. Apr 1, 2009 When considering the steps necessary to repair or replace valve seats, be aware that with two types of cylinder heads you have three options aluminum with removable valve seats or cast iron, with removable or integral hardened seats. Crack Repair Cast Iron by Stitching Estimate. EZ Bore used to make a valve seat removal and installation system. 030 in. Hit it squarely with the hammer to create a starting point for drilling a pilot hole. Prices for redoing the heads are a bit high for her (and me). If you are replacing a valve cover, you will need to remove the old cover and replace it with this new one. This will help to vibrate the keepers which will make their removal just a little smoother after the spring is compressed. I&39;m looking at picking up a set of aluminum heads for my 350. Bronze, on the other hand, is a very general description as there are a variety of 'bronzes' used by various folk. vl mq. How to remove valve seats from aluminum heads. Just dust the gasket surface if there is residue but if you tanked them that shouldn't need much. Once tire pressure is indicated on the air gauge (inflation pedal in position 1; foot removed from pedal), continue to inject air into the tire in short intervals. When considering the steps necessary to repair or replace valve seats, be aware that with two types of cylinder heads you have three options aluminum with removable valve seats or cast iron, with removable or integral hardened seats. The bigger heads to follow were the double-hump heads championed by the mid-60s 327 engines. 248 pilot - 6 overall length Valve Counter Bore reamer. Cylinder Head Skimming. com Premium Member Joined Jun 7, 2009 9,048 Posts 15 &183; Jan 9, 2015. (31) Estimated Ship Date Monday 9122022. There is a fix for "curing" the problem of valve guide migration but it is at a skill level and tools requirement level a tier above most mechanics. How to remove valve seats from aluminum heads. A magnifying glass. Cast Iron- 350 Aluminum- 300 Stage 2 Porting Same as our stage 1 porting, with the addition of work performed around the guide bosses and some valve. Every time the exhaust valve closes, if it is red hot, it tends to "micro weld" itself to the seat. The same tool also has the potential for easily pulling valve seats out of aluminum heads. Cutting new valve seats is the next step in the head rebuild process. When this happens, it causes rough running and creates noise. James gave some insight on the problem below. Located under the valve covers, the casting number is the best way to ID a SBC head. Almost all valves are 45 degrees. The same tool also has the potential for easily pulling valve seats out of aluminum heads. Also note the new grommets on valve cover bolts. Make sure that all retaining slips and hardware are removed from the top of the shaft where it attaches to the column, remove the column and then remove the gear box and shaft. LS3 lightweight, hollow stem intake valves can be cut to fit the seats, and better valve springs are a necessity for high RPM. Identify the noisy rocker arm using a mechanic&39;s stethoscope or rubber hose as described in the previous section. This relieves pressure and allows the seat to be easily removed. The welding is done with an acetylene torch and a neutral flame. -ft of torque at 4,000 rpm. Prepping AMC V-8 Heads For Performance Use. 00 324. In 1979 1981 a high compression draw thru carbureted turbo version of the 2. In our Chevy V8 example this is the intake valve for the 8 cylinder. The valve guide should be punched from the combustion chamber side. Cutting seats out also is an option, though the process has to be mistake-free or the cylinder head will need repair if damaged. can be easily removed, reinstalled and adjusted while the head is mounted in the workstation. Engine mounts are unique. To do a proper valve job you will need three angles the contact surface and two "narrowing angles" immediately above and below the contact surface. If you are looking for cheap, bolt-on power, go with 351W heads and leave the ports alone. If you are replacing a valve cover, you will need to remove the old cover and replace it with this new one. Engine mounts are unique. 091" Inner of the Outside spring. The combustion chambers are available as large as 74 cc. Engine Valves. You can also soak metal parts for up to 15 minutes to remove stubborn deposits. ) 21. After the coil is inserted you then bust off the tang. The K20C1 uses a powersports-style spark plug that is smaller than the traditional 14mm thread used on the K20A. Removing the heads soon on my (mostly) stock 220k mile RT Magnum to fix my leaky head gasket and exhaust leak, and planning on having the heads cleaned up and decked while they are off. For example, a faucet stem. After the coil is inserted you then bust off the tang. Tighten the adjusting nut until theres a slight drag when moving the feeler gauge. Apr 2, 2015 With aluminum heads, it would be TIG welding. It's a normal deal for the early heads. We have also catered for classic car owners , replacing valve seats on BMC A series, MGB, Ford and Mercedes. Here is the process forremoval. TO DO SO WILL REMOVE THE PLUG SEAT ANGLE THAT THE COUNTERBORE CUTTER USES TO SET THE DEPTH FOR THE INSTAL-LATION TOOL. Common mistake 1 Not replacing all the intake seats. Step 6 Heat Up Aluminum. LS3 Mongoose - 12&176; Cylinder Head. The 2. Scrape again, if. A variety of methods can be used to remove valve seat inserts from aluminum heads. I suspected a dropped valve seat and today I pulled the head off to. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. Over time, a valve seat can become worn, which can reduce its effectiveness and lead to a loss of compression. How to remove valve seats from aluminum heads. 6 valves. endgap to. All of the engines in the Atlas engine lineup share a common architecture an inline cylinder configuration, dual overhead cams, variable valve timing on the exhaust cam, an aluminum block and head, and a relatively high static compression. BBC Magnum - 18&186; Cylinder Head. The Multi Purpose Induction tool (MPI) is used to remove worn valve seats from cylinder heads. Nov 12, 2018 Turn the head upside down, fill a chamber with fluid, angle the head to completely immerse one of the valves, then take an air gun, stick its wand into the intake or exhaust port, and shoot compressed air at the valve seat and look for bubbles in the fluid. For example, a faucet stem connects to a faucet handle using a single set screw. Putting the head in a cleaning oven is sometimes used to loosen the seats enough to where they may fall out. Because the head is an aluminum design, the valve seats are inserts that are pressed into the heads. 6 3 Tap the extractor in with a hammer. Jan 21, 2022 LS3 lightweight, hollow stem intake valves can be cut to fit the seats, and better valve springs are a necessity for high RPM. Check Valves Silent (Wafer and Globe), Swing Check, Ball Check, Submersible, VFD, Ward, Flapper Style, and Other Check Valves. A magnifying glass. Diameter of the springs are. In this episode of Danny Soliz Says, Danny shows you the steps to properly install new valve seats. Engine mounts are unique. EZ Bore used to make a valve seat removal and installation system. Our complete cylinder head services include pressure testing, valve grinds, deck resurfacing, valve guide replacement, and porting of both aluminum and cast iron cylinder heads. The heads looked like they have a thick deck and were made pretty good. Before we describe all the steps that. Compatible with the Kubota 03-M Series Engine. iv mpvotes Vote Now The installed height of a valvespring is the total height of the spring when the valveis closed. Using gloves we now lay the head on the bench, take the (ice-cold) guides one at a time, dip the tip in some oil, and push into the head. Knowing the secret password necessary to keep good seats in place while allowing the damaged heads to release is critical (of course, there is no password). All components attach the same as original (intake and exhaust valves, valve guides, seats, rocker gear, etc. 2 in (55. Best HEMI Head Gaskets. Find DODGE 5. Cutting seats out also is an option, though the process has to be mistake-free or the cylinder head will need repair if damaged. For example, a faucet stem. Blend the seats into the chamber, you don't want an edge here to disrupt flow and create turbulence. In 1979 1981 a high compression draw thru carbureted turbo version of the 2. Then top quality solid bronze guides are installed and a competition valve job and bowl blending is performed. 004 in cast iron head and. Manual Quarter-Turn Valve Actuators White Paper. 00 each. 020" from OHC surfaces will result in 1 degree of advance in valve timing. 94" intake x 1. True Pushrods are used to transmit motion from the lifters to the rocker arms. I use the tig and lay the rod on the seat, top to bottom, and let the tig melt a puddle and dissolve the rod. 100" taller and have larger main journal diameters. The head must be perfectly clean and the valve guides, seats and any studs should be removed prior to welding. August 6, 2014 at 459 pm 611268. A worn guide will allow the valve to wobble slightly as it opens, which cause it to drift off-center with respect to the seat. 500 and. Follow all safety instructions in this guide, on the. Remove preexisting paint before applying spray paint by lightly sanding the project surface. Be very careful to avoid damaging the cylinder head. Clean and repaint head gasket, one coat. False Removal of 0. Engine mounts are unique. Other scrapers will damage the aluminum head. Engine mounts are unique. Putting the head in a cleaning oven is sometimes used to loosen the seats enough to where they may fall out. It's the same with guides. 002 to. 50 valves. A variety of methods can be used to remove valve seat inserts from aluminum heads. Cast iron will not remove heat nearly as well as some of the copper based hardened seats will. Below are the steps to the best way to remove a broken bolt with an extractor. 100 inch for the exhaust. Homeboy welded the seats with a mig bead, then they popped right out easily. Once final assembly is completed the heads are vacuum tested and then wrapped. The new block is capable of much more horsepower because of additional webbing and four-bolt mains. Cast iron and bronze valve guides fitted to aluminium cylinder heads require an interference of 0. As an example, lets say our cam produces a maximum lift of 0. Never pry it loose, as this may damage the head. Cast Aluminum Number of Springs Per Valve Dual Retainer Material Steel Lock Style 7 degree Rocker Arm Nut Thread Size (in. Common mistake 1 Not replacing all the intake seats. Flow numbers can be as high as 325 cfm at. A magnifying glass. 1) Rebore cyclinders & use 12 mm OS rings. Our coatings are easy to apply, scratch-resistant and clear, to make your surface look and stay new-looking. 00" - 1. Port development is accomplished using a superflow 600 flow bench with a computer recording all flow measurements. Because the head is an aluminum design, the valve seats are inserts that are pressed into the heads. For example, a faucet stem. This relieves pressure and allows the seat to be easily removed. Posted 3 days ago 1,150. First remove any hose clamps attached to the hose. Make sure that all retaining slips and hardware are removed from the top of the shaft where it attaches to the column, remove the column and then remove the gear box and shaft. climbers pants totk, pocket pussy diy
Once the guides have been reamed and the valves move up and down without binding,. . How to remove valve seats from aluminum heads
For example, a faucet stem. This also applies to using a punch to drive the seat out or prying it out. All cylinder heads are pressure tested to assure a leak-free casting. 94" intake x 1. It will then burn up, creating a large cloud of smoke out of the exhaust. Prepping AMC V-8 Heads For Performance Use. Posted 3 days ago. A Quarter Turn Valve is Designed to provide both on-off and process control functions. Cutting seats out also is an option, though the process has to be mistake-free or the cylinder head will need repair if damaged. The next most common cylinder head repair is replacing valve seals. The aluminum head will expand approximately twice as fast as a cast iron valve guide, therefore,. Aftermarket studs usually get torqued to 60 ft-lbs, but check with the fastener manufacturer for specific torque recommendations. True Pushrods are used to transmit motion from the lifters to the rocker arms. ) 21. A magnifying glass. Technician B says you must remove the camshafts last. Add to Wish List. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. Every time the exhaust valve closes, if it is red hot, it tends to "micro weld" itself to the seat. Valve seat recutting, each, 8. Any head can be fitted with larger valves, this only requires grinding the seats to match, about 50. Putting the . Use plastic to prevent leak-causing nicks. The equipment consists of an induction generator which generates . Confirm that the thread reach of the spark plug is the right one for your engine. The presence of the substance will make the screw easier to grip and youll be able to remove it successfully. Next, the heads are put into the oven at 140&176;C (300&176;F) for half an hour. I suspected a dropped valve seat and today I pulled the head off to. Breaking the bead requires a lot of force. This also applies to using a punch to drive the seat out or prying it out. Corvair cylinder heads are aluminum, so the seats, which have to be . The head must be perfectly clean and the valve guides, seats and any studs should be removed prior to welding. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. It's the same with guides. example shows six holes in the deck of a small block head. Enforcer As Cast. Furnace welding requires a skilled welder and preheating the head in an oven to 1,000 to 1,400 degrees F (medium red color). Step 2 Locate the big air duct that connects the throttle body to the air cleaner. Discussion Starter 1 Apr 18, 2021. After so many cycles, the metal fatigues and the head of the valve breaks off from the stem. The valve, valve spring, valve keepers, and the valve guide were intended to be installed and removed as a single assembly. Below are some before and after pictures of cleaning up the exhaust valves and the wire brush wheel I used. & parts 18. Otherwise, you risk transferring grease and dirt to the gaskets surface. Using a screwdriver, try to loosen the screw and remove the air duct gently. The material is much harder than the head and takes the abuse of the valve contacting. Jan 21, 2022 These heads can be CNC ported to remove the vane and improve airflow. 00 509 PREP Prep Block Cam Bearing Not Included (DOMESTIC). Let us replace your iron valve seats with our copperberyllium seats to insure reliability and longevity of your titanium valves. (31) Estimated Ship Date Monday 9122022. Jan 21, 2022 LS3 lightweight, hollow stem intake valves can be cut to fit the seats, and better valve springs are a necessity for high RPM. Some say . It's the same with guides. Grind the head of an old valve until it just slides down inside the valve seat. The valve seating systems are built with corrosion and wear resistant materials and tested to provide zero leakage. The Nissan VG33E is a 3. I managed to crack a new guide and bent the driver, . 3) Lap in exhaust valves. The welding is done with an acetylene torch and a neutral flame. For example, a faucet stem. Get new intake valves and re-cut valve seats. 4) Might as well degree cams. This can either be caused by a leak of the intake valve seal, which causes the engine to consume and burn oil inside the combustion chamber. Port development is accomplished using a superflow 600 flow bench with a computer recording all flow measurements. This can cause the head of the valve to flex slightly each time it closes (much like a valve with a nonconcentric seat). Find DODGE 5. To removethe old valve seat, insert the wrench into the seatand turn. Select a headthat fits snugly in the valve seatand place the headon the seatwrench. Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. Use thread sealer on all bolts that go into the water jacket, which means all blocks except Bowtie and aftermarket. The 1970 to early-71 heads with 51cc chambers (casting number 319-6291), and the mid-70 to mid-73 58cc heads (casting numbers 321-2993 and 321-3948). Using a screwdriver, try to loosen the screw and remove the air duct gently. All camshafts come with a recommended valve spring height; it is usually on the spec card included with the cam. Assembled, 65cc Chamber, 185cc Intake Runner, 2. Features 170 cc combustion chamber and 2. casting, is pressure test. 764 mm) Outside Diameter of Outer Spring 1. The material is much harder than the head and takes the abuse of the valve contacting. Though not a tool for removing seats, another piece of equipment that was introduced at the AERA show was a "Seat Ring Factory" by the K. The exhaust valve expands more due to heat from combustion, and therefore needs additional clearance. Chevrolet Valve Guides; Dart Head & World Products Valve Guides; Ford Valve Guides; Harley Davidson Valve Guides. Select a headthat fits snugly in the valve seatand place the headon the seatwrench. Do not over-tighten or you will risk damage to the camshaft in a short period of time. Getting the tubing hot enough may take 4 to 5 minutes. Weld the head of the valve to the ID of the seat, stem up,. Furnace welding requires a skilled welder and preheating the head in an oven to 1,000 to 1,400 degrees F (medium red color). Wrap up with the leaf bag carefully and quickly. These photos show the type of aluminum cylinder head damage we repair. Insert the driver through the valve opening and drive out the guide towards the top of the cylinder head. There are several reasons for developing a new aluminum block for the Flathead. Lee Company, Aberdeen, SD (800-874-9215. Rottler VR12 Valve Refacing Machine CHW-50 Cylinder Head Workstation Head Spring. Points gleaned 1) Rebore cyclinders & use 12 mm OS rings. Putting the head in a cleaning oven is sometimes used to loosen the seats enough to where they may fall out. Prices for redoing the heads are a bit high for her (and me). Arc welding a bead all the way around the seat also may allow the seat to shrink and loosen as it cools afterwards. These photos show the type of aluminum cylinder head damage we repair. Putting the head in a cleaning oven is sometimes used to loosen the seats enough to where they may fall out. Fel-Pro engineers analyze the OE design for every application. This also applies to using a punch to drive the seat out or prying it out. There range of cast iron exchange Holden six & v8 cylinder heads with there trade mark Yellow paint has now gone to the next level with the release of the Alloy holden six performance head. The 1952-53 models did not come from the factory with any hardened valve seat inserts, although they are often found with them now, having had them installed by an engine rebuilder at some time later on. Let cool and then tap the valve stem until it comes out. . It indicates, "Click to perform a search". The head must be perfectly clean and the valve guides, seats and any studs should be removed prior to welding. This means that the port size and shape. 25" intake and 1. Some cylinder heads have been welded or repaired. under the cam bearing. Cutting seats out also is an option, though the process has to be mistake-free or the cylinder head will need repair if damaged. Then you can figure out what to do from there. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. If the hole is completely stripped and you cannot get enough grip to remove the bolt, you will need to drill into the center of the bolt and have a bolt extractor on hand to remove it. Otherwise, maintaining fresh, full oil is the most effective prevention of lifter and valve train problems. 4) Might as well degree cams. After the head was flow tested with the 1. If the bolt is not corroded, a simple dry cloth will do. Heavy-duty bar pries out stubborn valve seat inserts and grease seals. Yes you need them with aluminum otherwise the steel spring will chew up the aluminum pretty fast. Repair loose valve seat with a new BRONZE valve seat. for both exhaust valves in 2 cylinder laying loose in the head. 610 exhaust valves. If you are looking for cheap, bolt-on power, go with 351W heads and leave the ports alone. Removing the heads soon on my (mostly) stock 220k mile RT Magnum to fix my leaky head gasket and exhaust leak, and planning on having the heads cleaned up and decked while they are off. Your choice of Valve Seats, Steel (STD) or Copper Alloy. It is measured from where the spring meets the bottom of the retainer to where it rests against the cylinder head. . ap has sha2 mic certificate using sha2 mic certificate for dtls