Ls 706 head specs

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 ...

LS COMBO DOME - compatible with LS1/2/6 style cathedral port heads & LS3 / L92 style rectangular port heads (Does not fit LS7 or 5.3L 706 & 862 Truck Heads) 1.0, 1.0, 2.0mm File Fit Performance Ring Set Included 65cc 66cc 70cc 402 4.000 4.000 6.125 1.110R 0.927 9.2cc 454 13.9 13.7 12.9 2618 0.500 0.0044 0.0054 930229600The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). The LH6 was available in mid-size SUVs until 2009, and in GM pickups from 2007-09. For marketing purposes, it was also known as the Vortec 5300.Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5.3-liter heads on a 6.0-liter. Our 5.7-liter head test bumped the average power by 9 hp but ...ProMaxx Performance HEAD LS 706/862 BARE. Part Number: 723-LS706NB. Product Q&A View Now. $385.00 ... Specifications: Part Type. Cylinder Head. Part Category. Performance Parts. Part Fitment. Semi Universal. ... XXTREME Bare 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. Min. Bore w/63 cc Combustion Chambers (0)706 Castech fix? I have a 2005 Silverado CC, 133K miles I recently picked up after a deployment to Afghanistan, its freshly lifted. I recently found out I have the dreaded cracked heads by Castech. I'm trying to narrow down my solution to my problem and wanted some opinions before I throw more money at this thing.

This program works on the following head casting numbers: 821. 823. 716. Now you can get this porting service on your cylinder heads at an incredibly low cost! Simply follow this procedure: Remove the cylinder heads from your car. Disassemble cylinder heads to completely bare condition. Wash cylinder heads.The LQ9 is a 6.0L Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec HO 6000 or VortecMAX. The information listed here is for the stock engine. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the GM family tree ...But, the combustion chambers are bigger than the 5.3 heads. You need to mill the 243 heads about .020" to keep the compression ratio the same. 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.get those projects done! should you run 706 heads on your 6.0l for more torque? what about the change in compression and detonation? what if i have to retard...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 ...Fits. The price listed is for you sending your cathedral port cylinder heads (4.8/5.3, LS1, LS6, LS2, LQ4/9) to us for porting. Our stage 1 porting service will include the re-use of the stock vales. Stage 2.5 will include aftermarket 2.02/1.57 stainless steel valves. We also offer valve spring upgrades. PRC CNC Porting/Machining Service Includes:HEAD LS 706/862 ASSM. Part Number: 723-LS706N. Product Q&A. View Now. $532.86. Lowest Price Guarantee. See more product details. Free Shipping - Estimated to ship direct from manufacturer on 03/25/24 , pending manufacturer availability. Learn More.

Cam specs play a vital role in compatibility as well. For example, a single-pattern cam with 224 duration and 112 LSA works best with mildly ported 706 heads. ... The amount of horsepower added by a Comp cam on a 5.3 LS with 706 heads depends on the specific cam profile and supporting modifications. Generally, this upgrade can provide a ...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...The intake and exhaust ports on the 243 heads are larger than those on the 799 heads, which allows for more air and fuel to enter the engine. This can result in higher horsepower and torque output. However, the smaller ports on the 799 heads can provide better velocity and airflow at lower RPMs, which can be beneficial for street-driven vehicles.Here's the push we started with a $350 craigslist 5.3L iron truck motor 350. We added a mild Isky cam, valvesprings, and lifters and added 70 big ones. It was too easy. Our dyno victim started ...

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The GM LM7 (Vortec 5300) features V8 90° cast-iron cylinder block with a five-bearings crankshaft, two aluminum heads, a single one-piece cast camshaft and two valves per cylinder (16 in total). The LM7 has a sequential multi-port fuel injection system and 78.0 mm (3.07 in) throttle body. The engine used a "Coil-Near-Plugs" ignition system.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 blocks (LM7 ...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.ProMaxx Performance. HEAD LS 706/862 ASSM. Part Number: 723-LS706N. Product Q&A. View Now. $532.86. Lowest Price Guarantee. See more product details. Free Shipping - Estimated to ship direct from manufacturer on 03/25/24 , pending manufacturer availability.On the other hand, the 706 heads come with 1.89" intake valves and 1.55" exhaust, respectively. The 243 heads come with 64.5cc chambers, while the 706 heads feature 61.5cc chambers. Although the 243 heads appear to be more excellent than the 706 heads, it may not be a nice combo with a tiny bore engine due to its larger intake valve.

The answer of whether 706 heads are better than 243 heads may depend largely on how you plan to use them and what engine you are putting them on. What Are …Upgrade your Chevrolet engine with precision-engineered CNC Ported LM4/LM7 706/862 Cylinder Heads. These remanufactured heads exceed OEM specifications, ensuring top-notch performance for your 5.3L V8 engine (03-09). Our ALL-20314PC pair of heads comes with .650 springs and 2.00/1.57 valves, making them the perfect choice for those seeking ...Had 10.7/1 comp, 243/258/110 comp cam with .625" ish lift. sv intake, 243 heads ported reasonably well with 2.02" 1.56" valves 50* seats, whitener 4150 carb. Pump gas pulls were the best on tq vs av gas but same hp. It made 590 Lbs TQ and 625 HP. it came in the start of the pull at 4000 rpm making 575 LBs.Why Is 862 Heads A Better Choice Than 706 Heads? Sand-casted 862 heads have proved to be better than others. They perform well, even with smaller exhaust valves ranging from 1.8 to 2.0 intake runners. 862 heads also possess small combustion chambers that increase the overall compression ratio provided by the 862 LS heads in cars like Chevy.If you’re in the market for a compact SUV that offers style, versatility, and advanced features, look no further than the Hyundai Kona. This popular vehicle has been turning heads ...Jun 28, 2018 ... THE ULTIMATE STOCK LS CYLINDER HEAD TEST! ... Porting LS 862/706 how much do they flow? ... WHICH IS BETTER-CNC PORTED STOCK LS HEADS OR AFTER ...The torque specifications for automobile engine cylinder head bolts are located on the Federal-Mogul Motorparts website. The search feature is available on the Specifications Looku...In this video - Erik shows you some simple porting and polishing techniques for LS aluminum cylinder heads! Time stamps and part numbers/links below!!GODSPE...Save yourself the time and expense of going to an aftermarket camshaft supplier and build your LS engine with a genuine GM cam. We've also got the valvetrain components you need to finish the engine, including lightweight components designed for high-rpm performance. LS1 / LS9 Cam. Duration @ .050" Lift ( Deg): Intake: 193 / Exhaust: 201.

May 31, 2017 · The 706 is easier to get higher compression out of unless the 241 has the chambers welded up and is then CNC'd. I had a set of TEA Stage 2 706 heads on my 99 TA for the last ~15 years and 128,000 + miles. Your compression with the 5.3 heads should have bumped you up to 10.6 as long as your short block is stock.

Specs: 2002 LQ4 bored out 20 thou to 4.02 ... old school SBC and SBF static and dynamic compression ratios do not apply to LS heads. 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. ... The 706 heads have a 61.15cc combustion chamber whereas the 243's have a ...Mar 1, 2018 · LM7 Cylinder Head Specs; Casting Numbers: 862, 706: Material: Aluminum: Combustion Chamber Volume: 61cc: Intake Port Shape: Cathedral: Intake Runner Volume: 200cc: Exhaust Port Shape: Oval: Exhaust Runner Volume: 70cc: Intake Valve Diameter: 1.890 in. Exhaust Valve Diameter: 1.550 in. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder ...The LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). The LH6 was available in mid-size SUVs until 2009, and in GM pickups from 2007-09. For marketing purposes, it was also known as the Vortec 5300.Jun 22, 2021 · The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the modified LS3 combination produced 552 hp at 6,400 rpm and 513 ft-lbs of torque at 5,000 rpm. After installation of the TFS Gen X 255 heads, the power numbers jumped to 571 hp at 6,500 rpm and 525 ft-lbs of torque at 5,200 rpm.Heads are 291's. Pistons have a .270 dome. Cam is 242/242 @ .050 .520/.520 lift 114 LSA. called the "143" cam (last digits of the part number) My 1970 SS454 LS6 SuperCar certified stock appearing 11.90@113 MPH. My 1964 Big Block Corvette Gasser. This is an older thread, you may not receive a response, and could be reviving an old thread.Cylinder Heads & Camshaft Packages. Add 100+ horsepower to your GM LS or Gen 5 LT engine with a Texas Speed & Performance cylinder heads and camshaft package! Our packages will include cathedral port, square port, and rectangular port cylinder heads to accommodate LS1, LS2, LS3, L99, LS6, LS7, LSA, LQ4, LQ9, L83, L86, LT1, and more! All ...The 799 head flow supersedes that of 706 heads with as much as about 20 cfm at specific lift points. The cylinder heads' intake port and exhaust port shapes are cathedral and D-port, respectively. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower.Had 10.7/1 comp, 243/258/110 comp cam with .625" ish lift. sv intake, 243 heads ported reasonably well with 2.02" 1.56" valves 50* seats, whitener 4150 carb. Pump gas pulls were the best on tq vs av gas but same hp. It made 590 Lbs TQ and 625 HP. it came in the start of the pull at 4000 rpm making 575 LBs.1697 posts · Joined 2011. #3 · Aug 19, 2012. From what I understand the crank and rods are the same specs. The bore and stroke of a 5.3 is 3.780 x 3.622. Rods are 6.098 in length. The iron block can be bored to an LS1 bore of 3.900. The aluminum block has sleeves and can be bored .010. So you can use your crank and rods and a set of LS1 pistons.

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The MLS head gaskets came in our Fel-Pro master gasket kit (PN 2817, $380). That may seem like a big chunk of change, but it included every single gasket and seal needed to rebuild any Gen III LS ...It was produced from 2007 to 2009. This was still an iron block, aluminum headed engine. The LY2 is an excellent engine! Because it's a Gen 4, it has stronger rods and a beefier bottom end than the earlier LR4 4.8L engines. It also came with the 799 heads which flow better and have bigger valves than older 706/862 heads.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.The 5.7L LS1 is the original Gen. 3 small block engine from General Motors used in cars from 1997-2004. The LS1 engine specs and information here is for the stock 5.7L LS1 engine. Mechanically similar, GM's LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even ...The answer of whether 706 heads are better than 243 heads may depend largely on how you plan to use them and what engine you are putting them on. What Are …As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. ... 823 vs 706 Heads. The 706 cylinder heads are built to generate excellent performance, which can reach up to 4,000 rpm.The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000. The engine specs and information listed here is for the stock LQ4 engine. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the GM family ...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 ...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 ...Record the amount of water added and the mass of the soil-filled mold. 5.1.3 Remove the material from the mold and cut vertically through the centre, taking a representative portion to determine and record the moisture content according to the Method of Determination of Moisture Content of Soils (MTO Method of LS-701).The springs on the three sets of EQ cylinder heads in our test were swapped for a set of Comp Cams 26918-16 coils (street price, $193), which have specs at 125 lbs seat pressure and 367 lbs. at ...CYLINDER HEAD SPECS. Bolts on to any 289/302/351w, 351C, and LS Chevrolet engines, 4.00" bore or bigger. . Accepts any existing Windsor style intake manifold . LS engines will require a Hogan Sheet Metal, Billet, or modified cast intake manifold. Comes with 2.200"/1.650" Competition Stainless Steel valves. ….

Just used for tear down and re assemble. They had it listed as a Zo6 motor and it has a dry sump oiling system on it. The heads on it have a casting number of 339k and a second set of heads say 706 on it. The block says that it is a 5.7, not sure if a z06 ever came with that. Attached are a couple of pictures of the heads.Description. This program works on the following head casting numbers: 862. 706. Now you can get this porting service on your cylinder heads at an incredibly low cost! Simply follow this procedure: Remove the cylinder heads from your car. Disassemble cylinder heads to completely bare condition. Wash cylinder heads.706 Heads Specs. High-performance cylinder heads like the Chevy 706 LS Heads provide a ton of power at an unbelievable cost. They are the most cost-efficient and efficient remanufactured cylinder heads available, and they may be used to produce 4.8L, 5.3L, or even 6.0L LS engines. Their tiny cross-section reveals a high-velocity, smaller-volume ...The 799 heads are also great for those looking to increase the total valve lift on their LS engine. 706 heads. The 706 heads are great for optimizing their LS engine for performance. The 706 heads feature high-flowing cathedral intake ports intended for higher-performance applications. They have a larger valve spring package supporting higher ...This head is "designed to have the intake configuration of a LS3 head, but fit the smaller bore blocks of the LS1 and LS6 engines.". Hardest of the Hardcore: LSx-DR - Part Number 19166979. Huge CNC'd intake ports, huge valves, and huge power potential all define the LSX-DR heads. LSX-DR Specs:GM LS2 LS6 Gen III Gen IV Cylinder Head 799 Assembly w/ Rocker Arms OEM-This is a Remanufactured OE Stock LS2, LS6, 4.8L , 5.3L, 5.7L, 6.0L Gen III / ... * Specs : Combustion Chamber Volume: 64.45cc Intake Port Volume: 210cc ... GM Chevrolet 6.0L LS GEN IV 58X Tooth Crankshaft POLISHED STND Size 12685651. Your Price: $275.95 Out of Stock. Free ...862 Heads Specifications. Here are some common of the 862 cylinder heads: ... No, the 706 heads are pretty superior to the 862 heads. Recommended: Chevy 350 Head Gasket - A Detailed Overview. Q: What heads are on LM7? General Motors designed LMS engines with the 862 heads installed. It featured an aluminum design and a combustion chamber …The LS1 heads can help you attain better performance and fuel economy at a low price. LS1 is one of the engine variants that is known for its horsepower and torque. The LS1 heads can help you attain better performance and fuel economy at a low price. ... Chevy Cylinder Head LS 5.3L V8 706/862 Aluminum - Pair, Year:99-06 . David Perry. Great ... Ls 706 head specs, 3,581. they used to install the 2.0 valves into the 5.3 heads but TSP found out that installing the larger valve actually hurts the flow of the head since the runner was never designed for that size intake valve. 2002 Lightning - GT headed 5.5Litre w/ Twin 7665s. 2002 Silverado - 427Lsx w/ Twin gt4202s., Avoiding 706 castech heads. Hey guys, I just joined this forum because I am looking to buy a silverado/sierra soon but still have a couple questions. Right now I'v got a 2004 5.3 tahoe with leaking castech 706 heads. Iv decided to trade it and and I'm trying to avoid having the same problem again with my new truck., Product Details. Beehive style springs. Used on LS7 cylinder heads. 1.960" installed height @ 101 lbs. pressure. 1.368" @ 310lbs. pressure., Last updated on 05/06/2024. The LS4 engine is a Gen. 4, 5.3L, aluminum small block engine used in GM cars between 2005 and 2009. It is unique because it was the only LS engine used in front-wheel drive vehicles. The FWD LS4 had cathedral port cylinder heads and used Active Fuel Management (AFM). The engine was not Flex Fuel (E85) …, The LS1 heads have 67cc chambers with 2.00/1.55-inch valves. Other heads you'll run into are 852 and 706 castings, which have smaller 61cc chambers and …, 806 is the casting # of the heads . Its on the front corner . 806 is the worse flowing LS1 head and has perimeter valve cover bolts .They came stock on the 98-99 F bodys . 241's are a little better . I believe they came on 00-02 . 243's are the best of the 3 . 243's in stock , untouched form will add @ 20-25 RWHP over 806's and 241's., Cylinder Heads & Camshaft Packages. Add 100+ horsepower to your GM LS or Gen 5 LT engine with a Texas Speed & Performance cylinder heads and camshaft package! Our packages will include cathedral port, square port, and rectangular port cylinder heads to accommodate LS1, LS2, LS3, L99, LS6, LS7, LSA, LQ4, LQ9, L83, L86, LT1, and more! …, If the 706s are useable as-is, just run those. Then when you add the turbo, bolt on the 317s. Also consider the SUM-8728R1 cam 212/218 110+3 .600/.585. Similar specs to the BTR Truck Stage 2, but the additional valve lift will complement boost., get those projects done! should you run 706 heads on your 6.0l for more torque? what about the change in compression and detonation? what if i have to retard..., 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., 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 only difference is the marking stamped on top of the metal half (the casting number), stating that it is a 706 or 862. What LS motor has 862 heads? The LSA, LS9, and LT5 engines have the cylinder head designation of 862. The LS9 motor (also known as LSA) has 862 heads. It produced 580 hp in the ZR1 Corvette and 580 hp in …, 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 ..., 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 ..., 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 ..., Chevy GMC 4.8 5.3 Cylinder Head #706 1999-2007 (no core) Silverado Suburban Yukon - Repair your engine with our high-quality cylinder heads! ... The part is made by Engines R Us with the highest quality standards, ensuring the product meets OE specifications. It is part number EHC359-B and fits both the 6 and 7 models from 1998-2002 and the C ..., Aug 3, 2022 · Incidentally, 799 heads are essentially identical to 243 heads, but the 243 casting has a smoother finish. 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 more money, the 823 LS3 cylinder heads are fantastic all-rounders. The Final Verdict, LS2 heads work by increasing the airflow to the engine, which in turn improves engine performance. This increased airflow is achieved through several design features, including larger ports, larger valves, and better flow characteristics. LS2 heads are designed to work with LS engines and are typically a direct bolt-on replacement for the …, Description. CNC Ported LS2 - 243 CYLINDER HEADS - Flows 632HP @ .600" lift camshaft! Suits the 5.7ltr and 6.0ltr LS1 & LS2. LS1 LS2 CATHEDRAL PORT. These High Performance LS1 LS2 243 Cylinder heads are a CNC version of the High Performance replacement to the GM 243 heads. All factory mounting points with the Performance of a 243 port and chamber., LS telcom News: This is the News-site for the company LS telcom on Markets Insider Indices Commodities Currencies Stocks, 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 ..., The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped directly., GM 5.3 LS Full #706-862 quantity. Add to cart. ... Features; Flow Chart; Cylinder Head Options; Technical Specs; Additional information; N/A. N/A. N/A. N/A. Additional information. Weight: 28 lbs: Related products ... GM 2.2 507 NEW FULL $ 468.00 Add to cart. Performance. Performance Cylinder Heads. PROJECT X SERIES LS XXTREME SERIES SHOCKER ..., Great cylinder-head airflow has been a key enabler of the LS-Series' exceptional performance. Chevrolet Performance delivers those power-building attributes to you with a range of production-style aluminum heads — from the LS6 heads for smaller-displacement engines to LS7 style heads for 427-inch-and-larger combinations, our aluminum heads benefit from Chevrolet Performance's extensive ..., The LH8 is a 5.3L Gen. IV aluminum block engine truck engine that appeared in 2008-09 GM trucks, including the Hummer H3, Chevy Colorado, and GMC Canyon. The engine specs and information listed here is. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM …, GM never made an iron LS1. Look at the front of the block and it will clearly have the displacement cast into it. If it is a 5.3, slap some 243's on it and a punchy mid range cam in it and it'll be a good street brawler. If it is a 4.8, some aftermarket heads with revised valve angles and dual valvesprings (TF Gen X 205 for example) and a cam ..., 5.3 truck heads (casting #862 and 706) are also a very popular base casting for porting/modifying, due to their even smaller (61.15cc) chamber size which raises compression when used on a LS1/6 engine.. 6.0 truck heads (casting #317) are popular heads with the forced induction crowd, as they are basically the same as 243 heads, but with larger ..., Object moved to here., Specifications: Part Type. Rocker Arm. Product Line. Speedmaster Stainless Steel Rockers Arms ... The Speedmaster 746-PCE261.1092 rocker set will work with 706 cylinder heads. Answered by: jshook. Date published: 2023-05-05. Will these fit in stock ls 317 heads? Asked by: Kegler. Speedmaster 746-PCE261.1092 will fit 317 casting heads Answered ..., ProMaxx Performance. HEAD LS 706/862 ASSM. Part Number: 723-LS706N. Product Q&A. View Now. $532.86. Lowest Price Guarantee. See more product details. Free Shipping - Estimated to ship direct from manufacturer on 03/25/24 , pending manufacturer availability., On our Mast heads, the LS3 head offered both more intake and exhaust flow than the cathedral-port heads, resulting in an intake-to-exhaust flow percentage (372/261 cfm) of 69.89 (meaning the ..., Mar 13, 2018 · 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 ..., Description. This program works on the following head casting numbers: 862. 706. Now you can get this porting service on your cylinder heads at an incredibly low cost! Simply follow this procedure: Remove the cylinder heads from your car. Disassemble cylinder heads to completely bare condition. Wash cylinder heads.