Ls 706 head specs

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Let’s talk though some specs of the 823 first (also known as an L92 head). The three-digit number refers to the casting process that created the single piece of metal that constitutes the head. ... 823 vs 706 heads. Similar to the 799s, the 706 will deliver better performance up to around 4000rpm. However, for racers willing to spend a little ...Head: 1997+ LS1 5.7 Litre Passenger Car Material: Aluminimum Part Number: 12558806 (1997-98) 12559853 (1999-00) ... Casting Number 706 Head: 1999+ LR4 4.8 Litre Truck 1999+ LM4 /LM7 5.3 Litre Truck Material: Aluminimum Part Number: 12559852 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust ...The 5.7L LS6 is the most powerful Gen. 3 small block engine as it came from the factory. It is an improved version of the LS1 produced for the 2001 Z06 Corvette. The LS6 powered the 2001-04 Corvette Z06 and the 2004-05 Cadillac CTS-V. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the ...The LC8 engine is a 6.0L Gen. 4 small block engine used in GM trucks and SUVs between 2011 and 2019. It is unique among the Gen. 3 and Gen. 4 engines in that it's the only one designed to operate on gasoline and LPG or CNG fuels. It's also unique in that it's the last of the Vortec Gen. 4 engine to be used in vehicles.FinOps Foundation introduces FOCUS, a standardized cloud cost data specification, to streamline multi-cloud financial management. The FinOps Foundation, a foundation under the ausp...

The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. For marketing purposes, it was also known as the Vortec 5300. The engine specs and information listed here is for a stock LC9 engine. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch ...According to the trusty flow bench, the chamber work did indeed improve the flow rate of our 706 heads, with the largest gains coming at 0.200 lift for the intake and 0.400 lift for the exhaust ...ALL Gen III heads are inter-changeble. However, they need to be matched up with the proper engine combo to see any gains. Here is a list of a known production casting #'s: 933 97 aluminum perimeter bolt 5.7 806 97-98 aluminum perimeter bolt 5.7 853 99-00 aluminum center bolt 5.7 241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 ...706 Heads. Not surprisingly, the 706 truck heads offered both the smallest port and chamber volumes. The combustion chambers on the 706 heads measured 61.5 cc, while the intake and exhaust port...706/ 862 CNC Cylinder Head Porting Service. $ 1,098.99. Add to cart. Category: Chevrolet. Description. Reviews (0) Our 706 & 862 ported heads include: Our in house CNC port. PCD surfaced to your desired chamber size.ALL Gen III heads are inter-changeble. However, they need to be matched up with the proper engine combo to see any gains. Here is a list of a known production casting #'s: 933 97 aluminum perimeter bolt 5.7 806 97-98 aluminum perimeter bolt 5.7 853 99-00 aluminum center bolt 5.7 241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 ...Below are its specifications. 706 5.3L Truck Castings. Valve size: Intake- 1.89, Exhaust-1.55. Port Volume: Intake- 197cc, Exhaust- 69cc. Combustion Chamber: 61.5 cc. Benefits of Casting Chevy 706 Heads. Most affordable, powerful, and effective. Superior to 862 heads in reliability and performance.

Object moved to here.Stock out-of-the-box Vortec heads have approx. 480HP potential naturally-aspirated. Fully race-ported flowing 275 cfm @ 28" water with 2.055/1.60 valves, potential is approx. 580 HP. There are reports of some shops getting close to 300 cfm out of these heads in fully-ported form.1996 Camaro Z28 forged 385 A4-, match ported heads and manifold with 3 angle valve job, 52mm custom ported tb, cc503 cam, 1.6 ratio rockers, dual spring valves, lt1 edit, pacesetter long tubes, 3.73 gears, t/a push button, tb bypass, 2.5" true dual exhaust with H, 3k TC, ls1 home made intake, and going in a simple diet12,557. The heads also bump the compression from 10:1 to 10.5:1 (stock for stock),,,,since they are milled (depending on how much) the compression should be even a tad higher than that. I'm sure the better exhaust side on those LS6 heads helped as well. Pretty interesting results for sure. 10-29-2010, 01:58 PM #5.Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches Stock Head Flow …

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The Gen III engines were the firstborn from the original LS1 in 1997 through 2002. These engines used a 24x crankshaft trigger wheel and a cam sensor mounted at the rear of the camshaft. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. The upgrades included a 58x crank trigger wheel with the …431 posts · Joined 2019. #9 · Jan 5, 2021. 706 heads out perform all others on a 4.8. Throughout the entire normal rpm range. It's not all just about flow. Those larger flow numbers from other heads are misleading. Yes they flow more than 706 however, only beyond 6000rpm. 706 heads are the best for the 4.8.Ported LM4/LM7 706 Cylinder Heads with Springs Rockers Valves PAIR. Brand new 0 mile valve job w/fel pro seals Cleaned and magnafluxed Broken exhaust bolts removed All mating surfaces surfaced Skip to main content ... 706 Vortec LS Cylinder Heads Ported .600 Springs Trunnion Rockers Valves 5.3 4.8 (#325406773305) e***m (722) - Feedback left by ...Sep 30, 2019 · Surprising HP Numbers From Our Stock LS Cylinder Head Test I have ported 2 sets of LS heads so far and one was the 706. I did not flow it though but I was impressed at the shapes of the LS runners. I also did some LQ9 heads for a buddy and noticed an area that looked like reversion was happening where the air comes towards the rocker stud boss.Tightening Sequence. To ensure proper tightening of the head bolts, follow this sequence: 1. Start with the center bolt and tighten it to the specified torque (22 ft. lbs. or 30 Nm). 2. Proceed to the bolts on either side of the center bolt and tighten them to the same torque. 3. Continue tightening the remaining bolts in an outward spiral ...

The large, raised runners and 12-degree valve angle enable substantial flow that supports large cubic inches. And the large valves necessitate a 4.125-inch or larger …The LS9 is a Gen. 4, 6.2L, aluminum small block engine used in GM cars between 2009 and 2013. The information listed here is for a stock LS9 engine. 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, Buick—heck, even Saab, Hummer, and ...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...But as for the 5.3/4.8 heads, they used the same cylinder heads, identical. The only difference from the 706 and the 862 heads, are the way they are made. The 862 heads are sand cast, and the 706s are SPM (Semi permanent molded), but with just a bit of machine work, the difference between the two is null.GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Buy It Now. Free shipping. 11 watchers. Save up to 10% when you buy more. teauran_0 (531) 100%. GM Chevy Silverado Suburban GMC Yukon 4.8 5.3 Cylinder Head Cast # 706 1999-2007.The L92 heads are another excellent choice. Originally found on LS3 or newer 6.2 LS engines, they offer square ports and improved airflow. If you're looking for budget-friendly heads with great performance potential, consider the L92s. d. GM Vortec 706 Heads. For those on a tight budget, the GM Vortec 706 heads are a secret weapon. These heads ...373/873 LQ4 iron heads - 71.06cc. 706/852/862 '99-up 4.8L-5.3L truck heads - 61.15cc ... L92 heads (often referred to as LS3 heads) moved to a rectangular port and are some of the best LS heads ...Nov 24, 2021 · Below are its specifications. 706 5.3L Truck Castings. Valve size: Intake- 1.89, Exhaust-1.55. Port Volume: Intake- 197cc, Exhaust- 69cc. Combustion Chamber: 61.5 cc. Benefits of Casting Chevy 706 Heads. Most affordable, powerful, and effective. Superior to 862 heads in reliability and performance.

WHICH STOCK LS HEAD MAKES THE MOST POWER? SHOULD I UPGRADE MY STOCK 6.0L HEADS? DO CATHEDRAL-PORT HEADS MAKE MORE TORQUE THAN A REC-PORT HEADS? WHAT ABOUT TH...

New “862” or “706” casting cores are CNC-ported and machined to specifications dictated by extensive research and testing. Each set of heads is milled …Swapping over to a set of 862 LS heads unleashes the true potential of built 5.3L engines. They can support up to a 230/238 .600" camshaft, 11:1 compression, and intake/headers for over 450 wheel horsepower. On a paired with a larger cam, the 5.3L engine really wakes up with 862 heads. They enhance the entire powerband, help it rev higher ...May 17, 2018 · The LM4 is a 5.3L, Gen. 3 small block engine used in GM trucks between 2003 and 2005. It’s is very similar to the LM7, except that it’s built on an aluminum block, and the LM7 is an iron-block engine. For marketing purposes, the LM4—like the LM7—was also known as the Vortec 5300.Aug 7, 2023 · 933: Found on 1997 LS1 engines up to mid-September. Although 862 and 706 heads share many similarities, the primary difference is that the 706 heads are made using SPM (semi-permanent mold) while the 862 heads are not. This makes the 706 heads slightly superior. Cylinder Head.Sep 24, 2015 · Don’t be fooled by the price tag, these cylinder heads have excellent capabilities, which have been exploited on many potent head/cam combos. New “862” or “706” casting cores are CNC-ported and machined to specifications dictated by extensive research and testing.Dyno testing on an LM7 5.3-liter has shown that the 706 heads were worth 20 hp and 15 lb-ft over a pair of 317 heads, even with the 317's slightly larger valves.Sep 24, 2015 · Don’t be fooled by the price tag, these cylinder heads have excellent capabilities, which have been exploited on many potent head/cam combos. New “862” or “706” casting cores are CNC-ported and machined to specifications dictated by extensive research and testing.The MV Motorcycles Channel provides details and specs on all your favorite models. Learn about MV motorcycle lineups at HowStuffWorks. Advertisement The MV Motorcycles Channel prov...RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...Find many great new & used options and get the best deals for Chevy Truck LS 706 / 862 CYLINDER HEADS SET 4.8 5.3 GEN III IV at the best online prices at eBay! Free shipping for many products!

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Intro to the LMG Engines. The LMG came in GM trucks and SUVs in 2007-'14 and made between 310-326 horsepower horsepower right out of the box. It's a Gen. 4 5.3L iron-block engine, so you're getting the better intake manifold, connecting rods, and ECM. The engine also had 799 or 243 casting heads which are closely related to the LS6.706 Vs. 799 Heads. When testing these two types: 799 vs. 706 heads on the 5.3L engine, I discovered that the 799 made the most flow, but it couldn’t translate into power. In this case, the 706 did a better job. 706 Vs. 862 Heads. The 706 model is made to be superior to the common 862. The semi-permanent mold (SPM) method is a consistent process.706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout.Sep 26, 2020 ... Today I installed and torqued down my LS1 cinder heads for my ls swapped is300 project Chevrolet Orange Engine Paint https://amzn.to/3hIh21D ...Despite numerous differences the Gen III LS Engine and Gen IV LS Engine cylinder blocks share a lot of the same traits. 4.400 Bore Spacing (same as the original SBC) Deep Skirt Block with Six Bolt Cross Bolted Main Bearing Caps (reminiscent of the old Ford side oilers, FE, and some early hemi blocks) Center Main Thrust Bearing. 9.240 Deck Height.Intro to L59 Engines. Meet the hidden gem that helped start the LS-swap craze. The L59 (along with the LM7) is a Gen. III, 5.3L iron block truck engine you can pick up in wrecking yards for about $600. The engine was introduced in 2002 and received a 10 horsepower bump to 295 in 2004 and was made through 2007.A pair of Chevrolet LS 706 cylinder heads With complete valve job. We also work on all types of cylinder heads. Our shop is devoted to rebuilding any cylinder head, resurfacing. Garland, TX. Location is approximate. Message. Auto Parts. See all. $5,500. 1965 Ford Mustang. Oswego, KS. $1,700. 69 C10 Chevy project. Columbus, KS. $950 $1,500.I picked up a newer 5.3 the other day with 706 heads. I'm planning on using a Tr220 cam. What would be a good amount to mill the heads to? ... for the change in length by subtracting the the new head gasket compressed thickness and amount shaved from the head from the original equipment specs or use a pushrod length checking tool. when being ...European Union countries and the Commission have agreed on a technical framework to enable regional coronavirus contacts tracing apps to work across national borders. A number of E...706 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout.Street Performance of The 706 Head. It’s worth noting that the 706 heads have a larger combustion chamber than the 862 heads, which measures at around 71cc. While this might sound like a disadvantage, it can actually be helpful for engines running on lower-octane fuel or those using forced induction. ….

The 5.3L LS Engine Family. The 5.3L LS, or Vortec 5300, is primarily a truck/SUV engine that spanned both the Gen. III and Gen. IV versions of the GM LS lifespan. It’s essentially a longer-stroke version of the 4.8L LS and powered vehicles such as the Silverado, Sierra, Yukon, and Escalade. The engine is made with both cast iron …The MTX Blue Thunder 10 is a car-audio subwoofer. The subwoofer prevents distortion without reducing power. The Blue Thunder subwoofer is small in size and has a sleek design, but ...BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. Generation III V8 cathedral intake port cylinder head. Casting 12564243. For truck, van, SUV and perfomance applications. Used on LS6, L33, L20, LH6, LY5, LMG, LC9,LS4, LH8, LS2, LFA, LZ1 engines. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 …The Definitive Guide to LS Engine Specs and LS Engine Upgrades. Posted 10/03/19 by OnAllCylinders Staff. Last updated on 05/03/2024. (Image/Summit Racing) This is the ultimate LS engine swap or engine upgrade resource. Scroll through the tables below to find the LS or LS-based Vortec truck engine that you own or are interested in building.Feb 13, 2020 · 706/852/862—1999-and-up 4.8 and 5.3 truck heads: 61.15cc 035/317/873 —1999-and-up LQ9 and LQ4 6.0 truck heads: 71.06cc 799 —2005-and-up 4.8 and 5.3 truck heads; these are...Jan 21, 2022 · RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...The 5.3L engines are equipped with 862-cylinder heads. The castings of cylinder heads are similar to that of 706 heads. 862 heads feature the following; 200cc intake runners, 1.890/1.550 in. valve combo, and 61cc combustion chamber volume. The 5.3L 862 cylinder heads have a cathedral shape intake port and an oval shape exhaust port.Summit Stage 3 Cam Specs: 230/242 duration, 0.625/0.605 lift, 113 lobe separation angle, 1.7:1 rocker arm ratio ARP LS Bolt Kit (PN 534-9805) ARP LS Head Stud Kit (PN 234-4317)Part Number: DRT-11081050. +2. Images. $5,427.57. Dart Race Series 10-Degree LS Cylinder Heads. Cylinder Heads NMCA Pro Stock Performance Race Series LS 10deg 368cc CNC Bare Head 2.3in x 1.6in valve job. See More Specifications | Check the Fit.The MTX Blue Thunder 10 is a car-audio subwoofer. The subwoofer prevents distortion without reducing power. The Blue Thunder subwoofer is small in size and has a sleek design, but ... Ls 706 head specs, Illustration by David Kimble. Other than the displacement (5.7L / 347.5ci), the aforementioned rod bearings and physical dimensions with previous generation LT1 small block, the LS1 was a new all-aluminum single-cam pushrod engine with a bore and stroke of 99 mm × 92 mm (3.898 in × 3.622 in) making this GM's first all-aluminum production V8. With the advancement of materials over the ..., Chevrolet Performance LSX-LS7 CNC-Ported Bare Cylinder Head. LSX-LS7 CNC-Ported Cylinder Head. 270cc Intake Port / 85cc Exhaust Port. 70cc Combustion Chamber. Bare, Sold Individually. View Details. $1,267.99. Ships on 06/21/24. FREE Shipping., batboy. 7477 posts · Joined 2005. #4 · Jul 27, 2010. The LS1 and 5.3 Vortec are both Gen III engines and share a lot of the same parts. Obviously, the 5.3 has a smaller bore. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow., The 799 and 862 heads have their own pros and cons. While the 799 heads offer better flow and performance, the 862 heads offer better combustion chamber design and improved efficiency. Ultimately, the choice depends on the specific needs and goals of the engine. Pros of Using 862 Heads. Cons of Using 862 Heads., 12,557. The heads also bump the compression from 10:1 to 10.5:1 (stock for stock),,,,since they are milled (depending on how much) the compression should be even a tad higher than that. I'm sure the better exhaust side on those LS6 heads helped as well. Pretty interesting results for sure. 10-29-2010, 01:58 PM #5., Trick Flow® GenX® 205 Cylinder Heads for GM LS 4.8L/5.3L/5.7L (Vortec) TFS-3051B001-C00. Cylinder Head, GenX® 205, Competition Ported, Bare, 58cc CNC Chambers, GM LS Vortec, Each. Part Number: TFS-3051B001-C00. Estimated Ship Date: Aug 14, 2024 if ordered today., Stock 04 (LS1) heads are the 241 castings with 67cc chambers. LS6 heads are 243 castings with 64cc cambers and larger ports. LS2 are 243 casting as well with 71cc chambers and the larger ports. the 5.3L truck heads are 706 and 862 casting and 61cc chambers. pretty sure about the LS2 info but could use verification., The factory-built motor dished out about 430 horsepower right out of the gate, and the cylinder heads play no small role in that impressive output. The LS3 heads hit the flow bench. The LS3’s 319-T5 aluminum alloy cylinder heads use 2.165 in (55.0 mm) intake valves, 1.59 in (40 mm) exhaust valves, and a 15 degree valve angle., Advertisement Kindle Paperwhite measures 6.7 inches (169 millimeters) high by 4.6 inches (117 millimeters) wide. It is a scant 0.36 inches thick (9.16 millimeters for the WiFi-only..., Summit Racing™ Precision Cast Cylinder Head SUM-162LS210CATH. Chevy LS Cylinder head, 210cc Cathedral port Intake Runner, 64cc Chamber, 2.02 Intake Valve 1.6 Exhaust Valve, 3.898+ bore sizes, Max .600 Lift Ea. Part Number: SUM-162LS210CATH. ( 1 ) Estimated Ship Date: Today., Read about LS engines and LS engine family online at JEGS. where we go over some of our favorite GM LS engine specs and differences. ... LS Cylinder Head Casting Number Location: externally at the far right end of the head on the exhaust-port side. ... casting # ending in 706, 852, 862, and 895 - LM4/LM7/LR4 , with 1.89 / 1.55 valves, 61cc ..., Here is a repair of a stripped LS (706) spark plug hole. Got lucky this didn't turn into a new head. Had to pull this head off, after the first video of it..., 706 LS heads - how'd I do? Post by KnightEngines » Mon Oct 14, 2019 5:04 am. ... 706 ls by tony knight, on Flickr 706 ls by tony knight, on Flickr ... As always thanks for posting results and specs! Top. brentry Member Posts: 128 Joined: Fri Aug 16, 2013 9:56 pm Location:, I compared a set of stock 799/243 cathedral-port heads vs the 823 LY6 rec-port heads on an LY6 short lbock. The motor was equipped with a healthy Comp cam an..., In general, most LM7 owners will add boost or nitrous before they begin serious cylinder head work. Before we get into the power adders, there are a couple of things to address. 1. A 4-corner steam kit reduces hot spots that can cause the piston rings to butt and snap the piston’s ring lands. 2., Katech CNC Porting LS1/Truck 862, 706 Cylinder Heads (PAIR) In Stock (0) Reviews: Write first review. Description: CNC Porting Service Item #: KAT-M7107. Condition: New. Price: $534.99. ... Description: For LS heads with dual springs and OEM or most bronze guides Item #: KAT-7536. Condition: New. Price: $7.99. Qty: Add to Cart, This also means that they are usually cheap to collect or replace. 706 heads tend to be more popular than 243 heads with those who run naturally aspirated engines. While they don’t have the same size combustion chamber they also don’t have the tendency to lower the compression ratio and reduce horsepower. When looking to replace your heads ..., 13305 posts · Joined 2004. #1 · Feb 26, 2007. I am second guessing myself, need some extra advice. I am about to swap out my stock 241 heads off my LS1 for some Stage 2E ported heads from MTI, casting #853. These heads flow 294.8 @.600 for the intake and 208.4 @.600 for the exhaust. Since this seems like going backwards (from the 241 heads ..., First pass 25lbft second pass at 50lbft, and finally a 3rd at 70lbft. Finally install the 5 smaller ARP bolts and torque them to 22lbft. If using motor oil use this: First pass 30lbft second pass at 60lbft, and finally a 3rd at 80lbft. Finally install the 5 smaller ARP bolts and torque them to 28lbft., WHAT STOCK LS HEAD MAKES THE MOST POWER? WHICH CAM SHOULD I RUN IN MY 6.0L? WHAT IS THE BEST STOCK 6.0L CAM TO USE? STOCK 6.0L UPGRADES! ARE THE 706/862 HEAD..., An LH6 build or LC9 5.3 build is popular for those on a budget just looking to make a nice 400-450 HP for a cheap LS 5.3 junkyard build. Any of these will work in a classic hot rod or muscle car using one of our LS swap oil pans for clearance. The one Gen 4 5.3 LS we do not recommend using is the LS4., The BSA Motorcycles Channel includes histories, photos and specs for BSA motorcycle models. Explore BSA motorcycles on HowStuffWorks. Advertisement The BSA Motorcycles Channel incl..., By Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has several main functions. Its first order of business is sealing the top of the cylinder (the piston seals the other end). The second order of business is to provide a way for ..., DESCRIPTION Professionally rebuilt 4.8 / 5.3 Chevrolet / GM cylinder heads Heads fit 1996- 2007 engines. These cylinder head's casting numbers are: 706 ONLY! These heads do interchange with the 862 casting number heads. THESE HEADS HAVE BEEN REINFORCED BY TIG WELDING AROUND THE FACTORY ISSUE HEAD BOLT HOLES IN THE CENTERS OF THE CYLINDER HEADS THIS IS FOR A PAIR HEADS!, Street Performance of The 706 Head. It’s worth noting that the 706 heads have a larger combustion chamber than the 862 heads, which measures at around 71cc. While this might sound like a disadvantage, it can actually be helpful for engines running on lower-octane fuel or those using forced induction., Has anyone tried to put a LS7 head on a 6.2l (LS3) block. 4.07 bore. Took a few measurements. On a 4.062 bore ... LS Fest True Street 2018 True St. winner 1/4 PB *9.06 @ 147 1/8 PB *5.75 @ 120. ... GM website gives specs for all the different COPO motors, only the supercharged motors say LS7 head on a 4.065 bore the NA 4.065 motors say LS3. ..., ALL Gen III heads are inter-changeble. However, they need to be matched up with the proper engine combo to see any gains. Here is a list of a known production casting #'s: 933 97 aluminum perimeter bolt 5.7 806 97-98 aluminum perimeter bolt 5.7 853 99-00 aluminum center bolt 5.7 241 01-03 aluminum center bolt 5.7 (some late MY00 cars got 241 ..., Upgrade your Chevy 5.3L V8 engine with our Remanufactured 99-06 Chevy 5.3L V8 706/862 Aluminum Cylinder Head (Part#: ALL-20314). To ensure a high level of performance, these Chevrolet heads are built to exceed OEM specifications. These 706 heads for sale are perfect for your 5.3L V8 engine, offering enhanced power and efficiency., Unknown member. #33 · Jun 4, 2014. The valve springs in your 2005 5.3 are the exact same as LS1 valve springs. Basically the whole valve train is the same. Used LS2/LS6 valve springs are easy to find and cheap. that will give you even more room to grow with up to a .570 lift cam., , Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ..., Cam that will work with 706 Heads; If this is your first visit, be sure to check out the FAQ by clicking the link above. ... Best guess is to call the people who ground the cam and give them the specs of the heads and valves and tell them what motor its going in. Most likely there wont be a problem since people have run .625 lift in a stock 5.3 ..., Cylinder Head Bolts (All M11) (2nd pass in Seq.) = 90 degrees. Cylinder Head Bolts (All M11 EXLUDING Med. Length F/R Bolts) (final pass in Seq.) = 90 degrees. Cylinder Head Bolts (M11 F/R Med. length) (final pass in Seq.) = 50 degrees. Then I found a thread on Here that says 90 degrees first pass the 70 degres last pass. Subtle differences.