The exhaust port is a unique D-shape that improves flow. LS6 heads are the best choice only when all-out power is needed. Be prepared for a big price tag at the dealer or steep core charge from your head porter. Casting Number 706 and 862. Head: 1999+ 4.8L / 5.3 Liter Truck . Material: Aluminimum . Part Number: 12559862 . 12561706GMC / CHEVY SUBURBAN 5.3 LITER V8 REBUILT CYLINDER HEAD. $225.00. Casting #. THIS IS FOR CASTING NUMBER 862 AND 706. WE ARE NEEDING THE CASTING NUMBER OFF YOUR CYLINDER HEAD. PLEASE FILL OUT THE FORM AT CHECKOUT OR GIVE US A CALL AT 800-942-4503 IF YOU HAVE ANY QUESTIONS. This listing is for a rebuilt GM 5.3 liter V-8 cylinder head.Learn what a 706 credit score means. See if 706 is a good credit score, what loans you can get & more. Everything you need to know about a 706 credit score. Find out if 706 is a go...243/799 LS CNC Ported Heads. Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.Cylinder Head, Enforcer, Aluminum, Assembled, 64cc Chamber, 210cc Intake, Cathedral Port, Chevrolet, LS, Each See More Specifications | Check the Fit. AFR 210cc LS1 Enforcer Cylinder Heads 1501 AFR-1501. 5 out of 5 stars. Part Number: AFR-1501. Estimated Ship Date: Tuesday 5/28/2024. ... AFR 210cc LS1 Enforcer Cylinder Heads.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 ...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...Automotive Racing Products 1863 Eastman Avenue Ventura, Ca 93003. Tel: (805) 339-2200 Fax: (805) 650-0742 www.arp-bolts.com. INSTALLATION METHOD FOR PRO SERIES ROCKER ARM STUD KITS. Part Number: 235-7202 Application: 7/16 Dia. BB Chevy w/ Dart Aluminum Heads.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 …241 was used on 01-04 LS1 engines. They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports. The 243 head is the 01+ LS6/LS2 head. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.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...The 70 LS-6 used the 291 closed chamber head the 71 used an open chamber head. They sold crate LS-6s that they lowered the compression on because of the bad gas with 188 open chamber heads. The real 450HP LS-6 had 291 closed chamber heads. 188 heads are not worth a lot of money there are just too many better heads made today.Do not do that. 706's have 61.5 cc chambers and 243's have 64.5 cc chambers so you will lose compression unless you mill down the 243's. 799 and 243 heads are generally accepted as 100% identical. The 243 could come on a truck, or a z06 with lightweight valves, which are also longer than all the other standard LS valves.Age. 34. Posts. 1,561. Red. 2001 Camaro SS A4. 706 heads on '01 LS1. Just wondering if anyone has played around with this before...I have access to some 5.3 heads (706) and was wondering how how these would do on the LS1 and what type of gains I could see with these. 12-01-2008, 05:31 PM #2.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 4.8 / 5.3 Cylinder Head PAIR Casting # 706 Chevy Silverado Suburban Yukon V8 OHV LR4 / LM7 / L59 / LM4 GMC 1999 - 2007 ... - All parts are cleaned and inspected before final assembly to meet AERA specifications. NO UPFRONT CORE CHARGE CORE RETURN REQUIRED WITHIN 21 DAYS OF DELIVERY ... GM 4.8 5.3 OHV Cylinder Head Casting # 706 LS V8 Chevy ...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 ...The LH9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2010-2012, including the 2010 Hummer H3. In 2010, the LH8 was replaced by the LH9. The LH9 was upgraded with VVT and flex fuel capability. It was available in the H3 for 2010. It was also available in the mid-size pickups until 2012.The cylinder head gasket is one of the most over-engineered and strained engine parts. That's why even the laziest mechanics or DIYers always tighten the cylinder head bolts to the manufacturer's torque and sequence. Naturally, neither should you. The third generation (LS1 and LS6) LS head bolt torque starts with bolts 1 to 10 and is 22 ft-lb for the first pass, 90° for the second pass, 90 ...Today I installed and torqued down my LS1 cinder heads for my ls swapped is300 projectChevrolet Orange Engine Painthttps://amzn.to/3hIh21DICT Billet Exhaust ...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 ...Cylinder Head, GenX® 205, Competition Ported, Assembled, 58cc CNC Chambers, GM LS Vortec, Each See More Specifications | Check the Fit. Trick Flow® GenX® 205 Cylinder Heads for GM LS 4.8L/5.3L/5.7L (Vortec) TFS-30510001-C00 TFS-30510001-C00. Part Number: TFS-30510001-C00. Estimated Ship Date: Aug 22, 2024. $1,184.99. Overview.Upgrade your LS1 or LS6 engine with our Remanufactured CNC Ported 243/799 Cylinder Heads with .650 Springs and 2.02/1.59 Valves. These high-performance heads, designed by Chevrolet, are meticulously remanufactured to exceed OEM specifications, ensuring top-notch quality. These CNC Ported LS heads, part number ALL-65056PC, fit engines …8678 posts · Joined 1998. #6 ·Nov 6, 2011. Unlike the 8.1L, which uses the same castings, but they're MACHINED DIFFERENTLY so they won't switch from left to right. . . For the good of the Free World, DEMAND COMPENSATION FROM CHINA for their release of the Virus Originating in the Wuhan Laboratory., released (intentionally or negligently) into ...JEGS 210840 - MLS Cylinder Head Gasket for GM LS Engines [Bore: 4.020 in.] $42.29. JEGS 210870 - Valve Cover Gaskets for GM LS Engines ... Specifications: Part Type. Exhaust Valve. Product Line. JEGS Performance Stainless Steel Valves. Lock Groove Quantity. 1-groove. Overall Valve Length. 4.890 in (124.206 mm)Description. GM CHEVY TRUCK SILVERADO AVALANCHE TAHOE TRAILBLAZER EXPRESS GMC 4.8 5.3 ALUMINUM LS4 OHV CYLINDER HEADS. CASTING NUMBER 706 AND 862 ARE INTERCHANGEABLE. SO IF YOU HAVE CASTING # 706 AND WE SEND YOU AN 862 IT WILL BOLT UP PERFECT. VEHICLES & YEARS APPLICABLE: These heads are sold as a pair. WE NEED A CASTING NUMBER, YEAR AND MODEL.NEW GM LS 317 HEAD - 6.0L. $349.99. Generation III V8 cathedral intake port cylinder head. Casting 12562317. Used in truck, van and SUV applications. Used on 6.0L V8 LQ4 and LQ9 engine models. See Vehicle Application tab for specifics. Add to Wishlist. Skip to the end of the images gallery.Jun 2011. Location. Clarksville, TN. Posts. 198. 862 heads for a 4.8L ? Got lucky at a local junkyard and snagged a set of 862 heads off a wrecked z71 2000-2006 body style. thinking about building these (port n polish, roller rockers, valves n springs to go with a nice cam) to put on my 06 gmc 4.8L .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. ...Professional porting and machining of combustion chambers required. No seats or guide machining. C5R rectangle-port design - requires aftermarket rectangle-port intake manifolds. Designed for big-bore (4.100" min) LS7/C5R/LSX blocks. 210-cc "as-cast" intake ports. 70-cc "as-cast" exhaust ports, same as production LS6.HOW TO BOLT ON 73 HP TO YOUR LS! DO PORTED HEADS ADD POWER? SHOULD I USE PORTED STOCK LS HEADS OR AFTER MARKET LS HEADS? SHOULD I UPGRADE MY LS HEADS? HOW MU...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 diet[Editor’s Note: This LM7 engine upgrade guide is part of a series of LS engine upgrade guides assembled by a team of LS experts at Summit Racing that we are sharing at OnAllCylinders. For a primer on the entire LS engine universe, read LS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family.]. Intro to LM7 Engines. Meet …When it comes to luxury and innovation, the Volvo XC40 is a standout in the automotive world. This compact SUV has been turning heads since its launch, thanks to its sleek design, ...Sort by: Add a Comment. J8ke_Stampede. • 1 yr. ago. There's no debate, it's been proven the 862/706 heads will make more power than the 317's. 317's and 241's are the worst factor LS heads. It's also not only because the chamber size and compression ratio either. 862/706 heads have higher velocity and better coefficient of discharge. 8.Chevrolet LS Gen. 3, Aluminum Block Torque Specs. Views: The following specs apply to RPO codes: LS1; LS6; LM4; L33 **Click the blue links in the table for more detailed information** Fastener Type: ... Cylinder Head Bolts: M11 x 2.0 x 155.5: 22 ft.-lbs. 90 degrees: 90 degrees: M11 x 2.0 x 101.0: 50 degrees: M8 x 1.25 x 46.0--22 ft.-lbs. Rocker ...Find AFR 210cc LS1 Enforcer Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 210cc LS1/LS2/LS6 Enforcer cylinder heads are available in standard and small bore applications. They feature Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners, and combustion chambers that allow for extremely accurate and repeatable port location ...243/799 LS CNC Ported Heads. Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.This is a Rebuilt OE Stock LS 4.8L , 5.3L Cylinder Head Assembly. Part # : 706 , 862 also fits. Description : Stock LS Series 4.8L / 5.3L Cylinder Head. Compatible with LR4 / LM7 / LM4 Engines. Specs : Combustion Chamber Volume: 61.15cc Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter ...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.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 family tree: Chevy, Pontiac ...The GM L59 (Vortec 5300) features a 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 L59 has a sequential multi-port fuel injection system and an electronic throttle body. The engine used a “Coil-Near-Plugs” ignition system ...You've seen what Boxee's beta media center software will look like. Now you can peek at pictures and specifications for D-Link's official Boxee Box, a small computer with HDMI outp...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 ...The Stage-4 LS cam offered by Summit Racing featured a sizable .625/.605 lift split, a 234/247-degree duration split and 113+3.5 LSA. Image/Richard Holdener. To test the Summit Racing cam, we first replaced the BTR Stage-2 turbo cam supplied with the 5.3L from Strictly Performance with a factory LS9 cam. Image/Richard Holdener.Installation instructions for Scorpion LS1 - LS6 & Vortec V-8 Rocker Arms: The first step is to make sure the pushrods are still in the middle of the lifters by spinning them while lightly pressing down. (If using 1.8 ratio rockers, you must check the pushrod clearance on the cylinder head.) Next, you must lube the top of the pushrods with ...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 ...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 stock ...The LMG engine is a 5.3L Gen. IV iron-block engine used in GM trucks and SUVs between 2007 and 2014. For marketing purposes, it was also known as the Vortec 5300. The information listed here is for a stock LMG engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM …LSXceleration Stainless Steel 8mm x 2.000 LS Intake Valve Set 15-22000-8 Stainless Steel LS Valves 2.165" Head x 8mm Stem x 4.870" OAL x 0.160" Tip x 45 degree seat angle Features: Hardened Stem Tip Chrome Plated Stem Fully Machined Surface Swirl... 15-22165-8 $96.00 Add to Cart Compare. Add to Cart Compare. Dart Stainless Steel GM LS 2.165 ...706 heads were per the year of the truck, and some what engine they are off of. basically gen3 ls blocks. on both 5.3l and 4.8lwhere the 4.8l had flat top and 5.3 were dished. 799/243 are the same head just depends where they were made. started getting used in the higher performance engines like the l33 and then later put on the gen 4 5.3l ...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 ...LS Auto Connect & Cruise; LT Auto Connect & Cruise; Small Block Auto Connect & Cruise; Big Block Auto Connect & Cruise; Manual Connect & Cruise Systems. ... Big Block Bare Cast-Iron Gen V and Gen VI Cylinder Head. $950.78. Quick View. Big Block Cylinder Head. $1,152.60. Quick View. Bowtie Oval-Port Aluminum Cylinder Head Assembly. $1,529.50.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...Small Block Chevy LS Cylinder Heads by Casting Number 10215339 – LS Small Block V8 1997 346, LS1, aluminum, 68cc chambers . 12480005 ... 862 99 and up 4.8-5.3 Truck heads 706 99 and up 4.8-5.3 Truck heads 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too***Description: 99-06 Chevy LS 5.3L V8 706/862 Aluminum Cylinder Head - PAIR. Introducing our Remanufactured 9-06 Chevy LS 5.3L V8 706/862 Aluminum Cylinder Heads - a perfect upgrade for your vehicle's performance. These heads have been meticulously crafted to exceed OEM specifications, ensuring top-notch quality and reliability. ...Oct 14, 2019 · 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.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 ...The LY2 is a 4.8L iron-block Gen. III engine that was introduced in 2007. It replaced the LR4 as the Vortec 4800. It was available in GM pickups, vans, and SUVs until 2009. These engines are strong and durable. Many people use them with boost or nitrous. With upgraded internals, the blocks can handle over 1,000 hp.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 ...LS 6.0L 317 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS 6.0L LQ4 LQ9 317 Cylinder Heads, Customer Supplied Bare Casting. $599.95. Buy in monthly payments with Affirm on orders over $50. Learn more. Options. Valve Job with new Valve Guides + $400.00. Resurface for MLS Gaskets + …The 243 heads came on the powerful LS6 engines from 2001 to 2006. Although the heads were initially made for C5 Corvettes, they later found their use in engines like the truck-spec LQ9 and LQ4. The LQ4 and LQ9 had 6 cc larger combustion chambers. LS6 was also used in some Camaros and Pontiac GTOs. The 243 heads are cast out of aluminum alloy ...The Peanut Port heads were introduced on the Gen V big blocks and were designed for truck applications. The ports are 1.56” tall and 1.44” wide. The smaller runner was designed to increased flow at lower rpm to help increase low rpm power and torque. These heads are not recommended for high revving performance applications.My friend has a pair of 862 heads in good shape for a good price. Just wanna know if I'll benifit from them at all from stock ls1 heads. I have a mild cam 218/227 long tubes and a lid plan on doing heads and a LS6 intake. I know 243's are good but didn't know if 862's are any good when they're right in front of me. They won't flow as good as ...Object moved to here.If you fall into that category, listen carefully. The most important part of your cylinder head is, as per Fig 6-3 and Fig 6-4, the area 1 inch before the valve seat to 1/2 inch after it on the intake and vice versa on the exhaust. Be aware that what you think is needed may not be what is wanted.These particular heads are 862 castings, replacing my 706 heads on my LM7.The 243 heads made about 20 RWTQ everywhere compared to the 317 heads, the chamber in the LS6 head is far superior to the 6.0 chamber. Bear in mind ECS had these same Stg 3 make over 600 RWHP on a N/A, hyd roller cam, pump gas engine that same year. Ask me about my LS and Modular spring kits! Always in stock!The BMW Motorcycles Channel includes histories, photos and specs for BMW motorcycle models. Explore BMW motorcycles on HowStuffWorks. Advertisement The BMW Motorcycles Channel incl...So, casting 862 heads would do favors for your car with a perfect set up. Last Words. In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.Cylinder Head Comparison Sheet GM LS GenX® Series Cylinder Heads for GM LS Product Name Intake Runner Volume Combustion Chamber Volume Valve Sizes Port Flow @ .600" Valve Lift Use GenX 205 4.8L/5.3L/5.7L (Vortec) 205cc CNC Competition Ported, Cathedral Port 58cc CNC-profiled 2.000" intake; 1.575" exhaust 284 cfm intake; 228cfm exhaustTiming Gear. The OEM cam gears vary in tooth count, bolt pattern, and sensor pickup. A - Single bolt 4X camshaft gear 2007-2014 LS2 or LS3 engine. GM PN 12591689. B - Three bolt 4X camshaft gear, 2006 LS2 Corvette or from a 2006-2009 LS7 Corvette engine. GM PN12586481.Quote: Originally Posted by lil john. True Tuskyz, also the 821's have less meat, *Some porters don't like to go over 270'cc while the the 823's are good to around 280'cc. Phil @ Advanced Inductions gave me a quote on the 280cc version on my #821 heads. Reply Like. 08-12-2016, 09:11 AM.Ultimately, the LS head bolt torque specs are pretty difficult to explain without a proper demonstration. Still, we can say that the third-gen LS engines (LS1 and LS6) are 22 ft-lb for the first pass (bolts 1-10), 90° for the second pass (bolts 1-10), 90° for the third pass (bolts 1-5), and 50° (bolts 6-10). And for the fourth pass, you ...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 ...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.Starting with a 2005 4.8-liter LR4 long-block, Roberts pulled the heads and cam, and that's it. With its 2005 build date, Roberts benefitted from having the upgraded Gen-IV factory crank, rods, and pistons. The short-block also has untouched main, rod, and camshaft bearings. One area that seems to be on the gray side of things in the stock ...Small Block Chevy LS Cylinder Heads by Casting Number 10215339 – LS Small Block V8 1997 346, LS1, aluminum, 68cc chambers . 12480005 ... 862 99 and up 4.8-5.3 Truck heads 706 99 and up 4.8-5.3 Truck heads 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too***. Are Chevy 706 Vortec LS V-8 Cylinder HeadsIntro to L59 Engines. Meet the hidden gem that helped start th ATK High Performance LS3/L92 255cc Aluminum Cylinder Heads 2CT13S1. Cylinder Head, 255cc, Intake Runner, 69 cc Combustion Chamber Volume, Assembled, 2.160 Intake Valve Diameter, Angled Plug, LS, Chevy Each. Part Number: HPE-2CT13S1. Not Yet Reviewed. Estimated Ship Date: Aug 21, 2024 if ordered today. The L33 engine with VIN code "B" is also called the Morning yall, 5.3 LM7 aiming for 450-500HP. Have the stock steel 706 heads and heard they are pretty solid for a stock casting, weighing if I NEED work done to them so they aren’t my limiting factor. I am putting a summit pro kit which bores it out to 5.4 with -2CC pistons which should be about 11.1:1 on the 61.2 chamber size of the 706 head. After installation of the 706 heads, the power jumped to 468 hp at ...
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