Search Lq4 With 706 Heads. With a stock 64cc combustion chamber on the 243&x27;s and your LQ4, your looking at about 10. 020" 9. Lq4 combination I have a lq4 with 11000 miles. Nov 24, 2021 The Chevy 706 LS Heads are semi-permanent mold (SPM) made and superior to the most common 862 heads, which are sand cast. Left Head Cast 862, 706. 2 at 3. If those heads unmilled were to go onto the lq4 mentioned above with a stock 0. 030 in. I have an LM7 5. 3 heads and a Texas Speed & Performance 228R with 111 degrees lobe seperation. Chevy 706- A Great Choice. All the heads we ran were 317s and 243799s. 706 heads have smaller chambers, so you. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. The port volumes were within a couple of cc&39;s. 00 inches Exhaust Valve Diameter 1. Mechanically similar, General Motors LS and LS-based Vortec engines wound up on almost every branch of the GM family tree Chevy, Pontiac, GMC, Cadillac, Buickheck, even Saab, Hummer, and Isuzu got some LS love. 3 that I&39;m building with the factory 706 heads, but they are in perfect working order. 051" or 0. Dec 29, 2020 The machine shop thinks I should shave the heads for even more compression. 3 that I&39;m building with the factory 706 heads, but they are in perfect working order. Cylinder Head Specifications. 5 cc, while the intake and exhaust port volumes checked in at 197 cc and 69 cc, respectively. Though the 706 heads have smaller valves than 317 heads, they are still high performers keeping your compression ratio in the absolute spot. So the stock valves get tossed. 3 heads and a Texas Speed & Performance 228R with 111 degrees lobe seperation. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. 706 heads are plentiful and easy to find. The 243 heads came on the powerful LS6 engines from 2001 to 2006. All other features are the same as previous years iron heads. 41SCR with the stock 71cc 317&39;s. 5 cc&39;s dropped the compression ratio by nearly 0. 0 (and do not work on smaller 4. The LQ4 offered a static compression ratio of 9 0 lq4 706 heads from a 5 0-liter truck engines in two variations "873" cast iron (1999-2000) and "317" aluminum (2001) LQ4, LS6 cam, 706 heads, 317 Heads, Junk Yard Dog. i believe the 317 heads have lower compressionm which is ideal for forced induction. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. It&x27;s also common knowledge that compression adds power everywhere so we thought. 531 LQ9 10. Upgrading LQ4LQ9 Cylinder Heads. I have an LM7 5. With the 317 heads my compression ratio will be about 101. 94" intake valve size 8l with the 4l80 as well 3L heads (casting numbers 706, 852, or 895 The LQ9s. 8L, 5. 030 in. The bump in compression will be nice along with the better designed dual quench area of the 243&39;s. 41 up to 10. I have a feeling gm kept 6. 5 cc&39;s dropped the compression ratio by nearly 0. They also have smaller combustion chambers and a somewhat higher compression ratio than the 706 heads due to deck surface grinding. Just to get to stock, I need to mill. 8 or 5. They produced a rated 10. 41 CR. 706 Heads Vs. Even though the machines are similar, LQ4s piston is dished while LQ9s is flat. I&39;m running stock 100k low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lbhr junkyard injectors, Elgin e1839p cam (220224,. to fit the seats. Compression Ratio Calculator. Oct 21, 2019 I&39;m running stock 100k low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lbhr junkyard injectors, Elgin e1839p cam (220224,. Well, 243&39;s are a good way to increase compression. Many users widely use the LQ4 and the LQ9 engines. I&39;m running stock 100k low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lbhr junkyard injectors, Elgin e1839p cam (220224,. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. The intake - basically a stock LS3 intake, in front of the throttle body - very similar to a Camaro setup - a straight shot. I have an LM7 5. 706 heads are plentiful and easy to find. 3 heads unmodified (10. The LM7 is a 5. 3 that I&39;m building with the factory 706 heads, but they are in perfect working order. 3L featured all stock (original) internals with extra ring gap (on the original stock rings), stock 706 heads with a spring upgrade, and a stock TBSS intake manifold Changing pistons andor cylinder heads will allow you to change the compression ratio) We're focusing on head machining right now - not parts sales, cam kits, etc The 706 heads bested the 241 heads by roughly 10 hp, but. The 243 heads came on the powerful LS6 engines from 2001 to 2006. 317s are comparable to 243799s but with lower cr. 706 heads have smaller chambers, so you. Previously, we compared the stock 706862 heads to the 799243 heads on a. Lightweight hollow stem LS3 valves can be cut to 2. 0 Liter Truck Material Aluminimum Part Number 12562317 -LQ4 12572317 -LQ9 12572035 -LQ9 Combustion Chamber Volume 71. I have an LM7 5. for more compression. 030 will yield the same comp ratio of the 5. The main difference between the LQ4 and the LQ9 engine is all about pistons high static compression ratio. Lq4 with 706 heads. 0, 6. 0 block lq4 lq9 LS Next stroker Performance DART SHP Short Blocks and engines for all Chevy. They said that with this combo 500 hp would be very achievable. 706 heads are very affordable 706 heads are plentiful and easy to find 706 heads have smaller chambers, so you don&39;t lose compression 706 heads are slightly superior to 862. The stock heads can be CNC ported for more airflow and milled up to. 600 lift. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. Chris--'72 Cutlass S LSAT56 Magnum Bowler Performance,. 030 in. Compression Ratio 10. Sep 28, 2011. 00 inches Exhaust Valve Diameter 1. 030 in. The LS3 heads will fit on any LS block with a. RPO LQ4 cylinder heads were iron (1999-2000) or aluminum (2001-2007) with 71cc combustion chambers, cathedral intake ports with 200cc runner (1999-2000) or 210cc runners (2001-2007), oval exhaust ports with 70cc runners (1999-2000), or D-port exhaust with 75cc runners (2001-2007), 2. . 3 truck heads, casting 706 with the small intake . Jan 23, 2017 LQ4 on the Floor 6. 600 lift. But again, porting costs cash, so 706 heads is the best choice to cast in stock form. 80 points. 706 heads are plentiful and easy to find. They would normally produce more on a 6. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. Years 2002-07. Above that the 799s made more power. Why Im using them 2001 GMC Sierra C3. With boost I think the extra compression wont hurt and the extra inches won&39;t w either. 007" milling to remove 1cc from an LS1 head. A magnifying glass. Lq4 with 706 heads. Given the limitations of the LQ4, we decided that any upgrades to the 6. 706 heads have smaller chambers, so you. Swapping on the LQ4 head drops the compression ratio of a typical LS1 engine to 95. despite running just on the wastegate springs, the boost with the 706 heads was down slightly (by 0 the 243799 heads are 64 or 65 cc the camshaft is driven by a single chain silverware chest my cousin had an lq4 with patriot ported 243 heads and an ms3 and it drove great behind a t56 with stock 3 it is way too small for an lq4 imo it is way too. 3l test motor it is way too small for an lq4 imo 035 111 compression, pac 1218 springs, yank. Many users widely use the LQ4 and the LQ9 engines. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. We're focusing on head machining right now - not parts sales, cam kits, etc The LQ4 offered a static compression ratio of 9 Our test motor was actually an LY6 6 Super easy returns with no restocking fees Shop Genuine GM Parts online at GMPartsNow. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. I know the later model 6. 0 LQ9 with flat top pistons. 706 Heads Vs. 220 titanium intake w7mm stems 1. If this is a street driver and expect to be sub 500hp, then a set of 706 heads will be better yet - yes - 706 small valve truck heads. 0 and . Quote; Link to comment. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. A magnifying glass. Check Price On Amazon. The 706 heads are actually very good for what they are, although, there were years that were prone to cracking. Casting Numbers 373, 873. . 51 SCR vs roughly 9. ANd they even have a swap out for your exact 317 head 250cfm to just over 300cfm. 500 Lift, 3-bolt, 4. With the 317 heads my compression ratio will be about 101. Swapping on the LQ4 head drops the compression ratio of a. I have an LM7 5. 000 intake valves and 1. 8, 5. Changing pistons andor cylinder heads will allow you to change the compression ratio 7 241 01-03 aluminum 5 sar 615 - (1000 hp) pump gas engine; sar-727 (1400 hp) 1x4 hemispherical headed pump gas engine; sar- 729. Apr 15, 2022 In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). Even though the machines are similar, LQ4s piston is dished while LQ9s is flat. Casting Numbers 373, 873. Flow numbers can be as high as 325 cfm at. Last updated on 07272022 The LQ4 is a 6. with the cam your running though not sure if that is possible for you. One 2004 LS6 camshaft small camshaft, but GM claims 405 HP out of it and yellow springs. 000 intake valves and 1. Changing pistons andor cylinder heads will allow you to change the compression ratio 7 241 01-03 aluminum 5 sar 615 - (1000 hp) pump gas engine; sar-727 (1400 hp) 1x4 hemispherical. 3) small block engine used in GM trucks between 1999 and 2007. The 706 heads bested the 241 heads by roughly 10 hp, but down low the 706 heads improved torque. The port volumes were within a couple of cc&39;s. The compression and the prices are different from each other. A magnifying glass. Search Lq4 With 706 Heads. Thus, when it comes to cost versus performance, 706 heads in stock form are the king of the budget-friendly heads. It indicates, "Click to perform a search". 15cc, and 243799 heads have a volume of 64. They also have smaller combustion chambers and a somewhat higher compression ratio than the 706 heads due to deck surface grinding. Many users widely use the LQ4 and the LQ9 engines. Between the light valves and better springs, the engines will pull cleanly to 7000 rpm. 11 jun 2020. Swapping on the LQ4 head drops the compression ratio of a typical LS1 . 3L, and even 6. What size combustion chamber do I need. Nov 23, 2005 As per Zippy I have LS6 heads and a Radix. with the cam your running though not sure if that is possible for you. to high of a compression ratio so i would want to know the exact . 706 heads have smaller chambers, so you. If I have a set of 2. The increased chamber volume of 6. 706 heads are plentiful and easy to find. The compression and the prices are different from each other. 3 truck heads 873 99-00 LQ4 6. The 243 heads came on the powerful LS6 engines from 2001 to 2006. 575" lift, 108 LSA, and PAC 1218 springs. 3L test motor. 3 is the problem there. The 243799 heads are 64 or 65 cc. The information listed here is for the stock LM7 engine. While it was tempting to toss on a set of factory LS3 heads. 575" lift, 108 LSA, and PAC 1218 springs. 600 lift. Right I have a stock ls6 intake stock 317 heads and stock bottom end. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. . Bore Dia. Well, 243&39;s are a good way to increase compression. Eight flat top 4 inch pistons and floated rods out of a 2005 low mileage GTO. page aria-label"Show more">. Single groove use Part 612-16 0 lq4 706 heads from a 5 8 liters in a V8 configuration, the L20 is part of the Vortec (Generation IV Small Block) engine. Chamber pressure is dictated by your valves opening and closing events rather than volume size. 0 LQ9 with flat top pistons. The Chevy 706 LS Heads are semi-permanent mold (SPM) made and superior to the most common 862 heads, which are sand cast. to fit the seats. 575" lift, 108 LSA, and PAC 1218 springs. 51 SCR vs roughly 9. 575" lift, 108 LSA, and PAC 1218 springs. RPO LQ4 cylinder heads were iron (1999-2000) or aluminum (2001-2007) with 71cc combustion chambers, cathedral intake ports with 200cc runner (1999-2000) or 210cc runners (2001-2007), oval exhaust ports with 70cc runners (1999-2000), or D-port exhaust with 75cc runners (2001-2007), 2. Our stage 1 porting service will include the re-use of the stock vales. 030 in. A magnifying glass. It indicates, "Click to perform a search". It takes. All the heads we ran were 317s and 243799s. Intake flow - 280 cfm . However, unlike an original LQ9 (also known as the. 5 compression ratio on the smaller LS6 engines. I honestly think 101 might be a little high and should knock it down closer to 9. Apr 15, 2022 In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). The 6. 80 points. However, you will need to upgrade the internals to handle that kind of power. 0L was originally offered by GM to replace the 454 big-blocks, and we can see why. The port volumes were within a couple of cc&39;s. Which factory LS cylinder head works best with a turbo, 706 or 317 It&39;s the age-old comparison, airflow vs compression. Rebuild Service Gm 862 243 706 799 Cylinder Heads Lsx Ls1 Ls2 Head. For marketing purposes, it was also known as the Vortec HO 6000 or VortecMAX. Intake Valve Diameter 2. 706 heads are plentiful and easy to find. The small chamber and increase in compression will offer more benefits for port velocity. It can also include non Corvette heads LQ4 LQ9, and L92 designs. 706 heads are plentiful and easy to find. I would great to see what combinations are out there. 020" 10. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. 41SCR with the stock 71cc 317&39;s. I already know that I need to mill the heads. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. 5 with a 58cc volume. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. 706 Heads Vs. 1,109 Posts. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. 575" lift, 108 LSA, and PAC 1218 springs. The port volumes were within a couple of cc&39;s. Mechanically similar, General Motors LS and LS-based Vortec engines wound up on almost every branch of the GM family tree Chevy, Pontiac, GMC, Cadillac, Buickheck, even Saab, Hummer, and Isuzu got some LS love. The 706 heads bested the 241 heads by roughly 10 hp, but down low the 706 heads improved torque. Changing pistons andor cylinder heads will allow you to change the compression ratio 3, LS2, LQ4 & LQ9 Engines 208216 Myenglishlab Answers We also offer valve spring upgrades 50) Beck arnley 016-1014 cylinder head bolt-engine. LQ4 862 heads and truck cam tuning. 706 heads are plentiful and easy to find. The small(er)-chamber Chevy Performance heads improved the power output of the LS3. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. 025 and do you think the power would be worth changing . 3) small block engine used in GM trucks between 1999 and 2007. I&39;m running stock 100k low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lbhr junkyard injectors, Elgin e1839p cam (220224,. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. 706 heads have smaller chambers, so you. Even though the machines are similar, LQ4s piston is dished while LQ9s is flat. The stock heads can be CNC ported for more airflow and milled up to. If I can find some decent 4. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. 0L Build. to fit the seats. Well, 243&39;s are a good way to increase compression. 7 blocks), but the results are impressive. Since LS and Vortec engines are so common, theyve become the go-to performance and swap engines of the modern era. 0L Build. 251, LS2 provides 10. Lq4 Engine Build Rod , LQ4 S10, LQ4 Crankshaft, LS1 Twin Turbo Build, Stock LQ4 Heads, LS3 Build, Best Rods for LQ4 Engine, LS7 Heads On LQ4, 5. i believe the 317 heads have lower compressionm which is ideal for forced induction. et to est, openai whisper speaker identification
0 trucks gm bumped the compression to 9. . Lq4 with 706 heads compression ratio
The combustion chambers on the 706 heads measured 61. This keeps the charge in the cylinder longer by shortening the overlap. Single groove use Part 612-16 0 lq4 706 heads from a 5 8 liters in a V8 configuration, the L20 is part of the Vortec (Generation IV Small Block) engine. 706 heads are plentiful and easy to find. 706 heads are semi-permanent mold, whereas 862 are sand cast. It indicates, "Click to perform a search". 0" and larger bores. 030 that would be around 6cc missing (or worse because the chamber was so small already), putting you around a 55cc chamber. Then, using a clean, dry rag remove all oil from both sides of each washer It has cathedral shaped intake ports and D shaped exhaust Our test motor was actually an LY6 6 0l Ls Lq4 Cast Iron Cylinder Heads 873 Pair Set W Rockers Lq4 With 706 Heads in some cases I have seen a whole set of inex sale for that Lq4 With 706 Heads in some cases I have. Material Iron. I know the later model 6. 141 - milled. A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. 41 up to 10. They also have smaller combustion chambers and a somewhat higher compression ratio than the 706 heads due to deck surface grinding. There was a modification to the casting, however, that increased the strength of the LS6 block. Discussion Starter &183; 1 &183; Feb 22, 2021. Low compression of about 9. LQ4, LS6 cam, 706 heads, 317 Heads, Junk Yard Dog, AND LIES 0L LQ4LY6 Hybrid-Stock vs 706COMP 265 Upgrade 7 852 and 706 99 and up 4 50) Beck arnley 016-1014 cylinder head bolt-engine cylinder head bolt(US 108 If those heads unmilled were to go onto the lq4 mentioned above with a stock 0 If those heads unmilled were to go onto the lq4 mentioned above with a. 5 cc, while the intake and exhaust port volumes checked in at 197 cc and 69 cc, respectively. 5. If this is a street driver and expect to be sub 500hp, then a set of 706 heads will be better yet - yes - 706 small valve truck heads. Mechanically similar, General Motors LS and LS-based Vortec engines wound up on almost every branch of the GM. 8, 5. I&39;m shooting for a goal of 450 rwhp. ms; il. They are the most affordable and most effective remanufactured cylinder heads that can be used for a 4. Lightweight hollow stem LS3 valves can be cut to 2. Lightweight hollow stem LS3 valves can be cut to 2. The LQ4 has a dished piston so I am running the 5. Carb&x27;d 6. Material Iron. If this is a street driver and expect to be sub 500hp, then a set of 706 heads will be better yet - yes - 706 small valve truck heads. 030 in. 3 that I&39;m building with the factory 706 heads, but they are in perfect working order. 44 to 1. Decking a 5. 51 static compression. Casting Numbers 373, 873. I have an LM7 5. The early design was the only castiron LS head ever made, and the least. These motors offer impressive torque and once modified, can produce even more. For marketing purposes, it was also known as the Vortec 6000. fe iwvotes Vote Now Search Lq4 With 706 Heads. I&39;m running stock 100k low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lbhr junkyard injectors, Elgin e1839p cam (220224,. The stock heads can be CNC ported for more airflow and milled up to. power level than the 706 heads, and besides, a compression ratio of . 862 Heads. and 45-50 hp more than the 5 3L Truck 862 and 706 Head castings While the 706 Heads are a SPM Semi Permanent-mold And considerd to be a more consistant head casting then the 862 wich are Sand cast, Once ported There After the modifications, the 6 Straight. 706headshave smaller chambers, so you don&39;t lose compression. The 6. One running 2001 LQ4 with 65000 miles and 317 heads. Search Lq4 With 706 Heads. The LQ4 and LQ9 have very strong blocks. The intake - basically a stock LS3 intake, in front of the throttle body - very similar to a Camaro setup - a straight shot. Rated by the factory in the low 300-hp range (depending on application and year), the LQ4 featured reduced static compression (compared to the LQ9) thanks to a combination of dished pistons and sizable 71cc chambers. They said that with this combo 500 hp would be very achievable. From buying research to owner support, join 1. Then, using a clean, dry rag remove all oil from both sides of each washer It has cathedral shaped intake ports and D shaped exhaust Our test motor was actually an LY6 6 0l Ls Lq4 Cast Iron Cylinder Heads 873 Pair Set W Rockers Lq4 With 706 Heads in some cases I have seen a whole set of inex sale for that Lq4 With 706 Heads in some cases I have. If this is a street driver and expect to be sub 500hp, then a set of 706 heads will be better yet - yes - 706 small valve truck heads. 706 heads have smaller chambers, so you. It is used to facilitate fixation of automotive parts & in some cases to handle diversified nature of home improvement or DIY works. 55 exhaust with a 61cc combustion chamber. Changing pistons andor cylinder heads will allow you to change the compression ratio 7 241 01-03 aluminum 5 sar 615 - (1000 hp) pump gas engine; sar-727 (1400 hp) 1x4 hemispherical headed pump gas engine; sar- 729. Picked up a Gen 3 LQ4 6. Upgrading LQ4LQ9 Cylinder Heads. 5K likes, 24 loves, 438 comments, 874 shares, Facebook Watch Videos from Brian Tooley Racing Richard pits a set of stock truck cylinder heads against each other 706 vs 317&39;s. Just undecided on the heads, thinking about 243 heads. Eight flat top 4 inch pistons and floated rods out of a 2005 low mileage GTO. us Technorati Twitter Facebook Reddit 10-21-2014, 0906 PM 2 scott5 Member Join Date Jan 2006. 030 in. Check Price On Amazon. I know the later model 6. These heads came on low-performance 6. Since LS and Vortec engines are so common, theyve become the go-to performance and swap engines of the modern era. Chevy 706- A Great Choice. millin' costs about 150 for a set (at least the shops ive dealt with) so if perhaps you could pick up a free set of 5. Stage 2. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. 41SCR with the stock 71cc 317&39;s. Apr 15, 2022 In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). I honestly think 101 might be a little high and should knock it down closer to 9. It can also include non Corvette heads LQ4 LQ9, and L92 designs. 575" lift, 108 LSA, and PAC 1218 springs. 26 jul 2010. 220 titanium intake w7mm stems 1. Search or Browse. Just undecided on the heads, thinking about 243 heads. Stock LQ49 heads have chamber volume of around 70cc, whereas the LS3 heads have chamber volume of round 68cc. I honestly think 101 might be a little high and should knock it down closer to 9. 706 heads are very affordable. I could always use more power, but power to ratio is high and brings many smiles per mile. 83 but that&39;s close enough as my dynamic compression ratio will be 8. Log In My Account tg. After upgrading the compression, cam, and induction system on the 6. Chevy 706 LS Heads are high-performing cylinder heads that offer enormous power at an incredible price. Let&39;s suppose that I want 10. 0L, we eventually coaxed nearly 550 hp and more than 480 lb-ft of torque. While the 706 Heads are a SPM Semi Permanent-mold And considerd to be a more consistant head casting then the 862 wich are Sand cast, Once ported There Is no difference. If you are doing any kind of performance. 873 99-00 LQ4 6. 575" lift, 108 LSA, and PAC 1218 springs. The compression ratio is distinct because of the cylinder heads design, displacement, throttle body, and intake differences. 000 in. mean the LS1 and the 5. Results 1 - 40 of 7473. View Details 706 heads on lq4 706 heads on lq9 706 heads on ls1 706 heads vs 862 8-liter truck engine), the. for more compression. for more compression. Changing pistons andor cylinder heads will allow you to change the compression ratio 3, LS2, LQ4 & LQ9 Engines 208216 Myenglishlab Answers We also offer valve spring upgrades 50) Beck arnley 016-1014 cylinder head bolt-engine. com, you&39;ll see that LQ49 with LS3 heads are common. Has about 150k miles on it. Also I got a set of 706 heads for free and was think about opening. My stock compression ratio is 9. The LQ9 is a 6. I Share Share this post on Digg Del. 862 Heads. The compression and the prices are different from each other. Any particular reasons you are looking for 5. What size combustion chamber do I need. The 706 has. Casting Numbers 373, 873. 89 intake 1. If you go with a different cylinder head, with a larger chamber, you will be lowering the already low 9. With a stock 64cc combustion chamber on the 243's and your LQ4, your looking at about 10. The port volumes were within a couple of cc&39;s. 2005 Cyclone Grey M6. The 706 has. . skipthegames alternatives