The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM ... these are basically 243 heads; See All 5 Photos. Vital Specs for 706 ...GM 4.8 5.3 5.7 6.0 OHV Cylinder Head Casting # 799 / 243 "LS" V8 Chevy Silverado GMC Sierra 2001 - 2017. Chevy 4.8 / 5.3 OHV Cylinder Head Silverado GM "LS" Casting # 862 GMC Sierra 1999 - 2007. ... **NO CAM SEALS HAVE BEEN INSTALLED ON ANY OF OUR HEADS**

The cam used was a 231/231 (LSL lobes) on a 114+2. No ported 243 head at 1500 will get you much over 470rwhp and even that will be with a huge cam that most wouldnt want to live with. A Trick Flow 225 with a mid 230's cam has the H/C 1/4 mile record in an LS2 and it isnt a crazy overlap cam.CNC ported GM 243/799 Castings Competition 5 Angle Valve Job 2.0" Intake & 1.55" Exhaust Valves 227cc intake runner, 84cc exhaust 62cc chambers Completely Assembled with our QCS Dual 660 Valve Springs w/ Titanium Retainers Laser Engraved QCS logo Sold in Pairs Lift Intake Flow Exhaust Flow .200" 148Jun 5, 2020 · The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft so ...After installation of the heads, offset rockers, and FAST LSXR intake, the LS3-headed stroker pumped out 581 hp and 543 lb-ft of torque. Note the LS3 heads increased both peak power and torque, though the rec-port heads did lose out to the 317s below 4,000 rpm. Despite the slight loss down low, torque production with the LS3 heads bettered 500 ...Of course, today’s 5.3 and 4.8 both have 243 heads that are factory-designed. 243 heads were included in the LS6 engine produced between 2001 and 2006. You can determine the 243 heads on the 5.3 by examining the three-digit stamping next to the valve cover. The Sierra 1500 and Silverado from GM produced between 1999 and 2013 had 243 heads.

The heads in question (5364) heads also came on the Gen IV truck 6.0 07+ (LY6), so you should have no problems getting them to fit. You'll need heads bolts for pre-04 gen III engines (later engines stop using the longest bolts) You'll need an LS3 intake to get your desired lower profile intake. racinnut15xm. Pro.The cheapest way is to have your 243 heads ported, probably less than $1000 without labor and tuning. Patriot heads are about $1300+/-. Most other aftermarket heads will be over $2000 for the heads alone. You can get a whole L92/L76 swap kit for about $2100. To get a Ls2/Ls6 head to flow what a L92/Ls3 head flows will take a lot of work, and ...GM LS6 LS2 Gen III Gen IV Cylinder Head 243 Assembly Set w/Rocker Arms OEM. Opens in a new window or tab. Remanufactured. $685.75. rollingautomotive (21,312) 98%. Buy It Now. Free shipping. ... 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. Save up to 10% ...

Oct 15, 2021 · Beyond everything, 862 LS heads offer enormous power at a budget-friendly cost. Also, there are hundreds of thousands of 1999 862 heads and up to 4.8-5.3 truck heads: 61.15cc available to port. Why casting 862 heads is a great choice . If you are still not convinced, read through to understand why casting 862 heads is a great choice. They are:LS1 with 862 heads. I may have found an LS1 shortblock I can drop in my truck but I want to know if I can use the 862 heads from my 4.8 on the LS1. Also, what will the CR be if I use the 862's on the LS1. Thanks in advance. It will bump your CR up a hair, 4.8/5.3 heads and LS1 heads flow the same, the only difference is the combustion chamber.

asu prep school calendar The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243's. Valve sizes are identical in both sets of heads. I know that when replacing heads you should have them worked (e.g.- valve job, and such).The 862 head is commonly utilized in high-performance cars, racing, and sports cars. It's also found in some luxury and sports cars. The 862 is a 12-valve design that utilizes two intake valves per cylinder and one exhaust valve per cylinder. The combustion chamber volume is 84cc for the 862S, 83cc for the 862C, 84cc for the 862F, 82cc for ... average weight for 5'2 girl There are significant differences between the LS1 and LS2 cylinder heads. The main function of cylinder heads is to control the inflow and outflow of air in the engine. One key difference is that LS2 cylinder heads allow more airflow as compared to LS1 heads. Further, the combustion chamber of LS1 has a volume of 67cc, which is larger … huge zit videos It's about 0.11" smaller than the stock at 2". Exhaust would remain the same at 1.55" The 317 flows quite well stock and can pick up about 70cfm intake/40cfm exhaust with mild work on stock valves from what I've seen. Looking at a high velocity, high torque head on the cheap maybe. If it requires new valve seats I don't think it'd be worth ... logic equivalence calculator 118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote. unhide messages groupme 7477 posts · Joined 2005. #5 · Jul 14, 2010. The .040" Cometic gaskets will raise compression ratio, not lower it. That said, the GM MLS gaskets seal up the best and are a decent price. I got mine from Texas Speed. Get the LS1 gaskets that are 3.910" bore diameters. That's what I used and I have no problems.A comparison of EQ's cathedral-port intake port windows revealed the "317" casting (left) to be 3.19 x 0.965, while the "243" unit was 3.149 x 1.035. Both ports weigh-in at 211 ccs. From a pure... the grinch signs Dec 3, 2013 · 4135 posts · Joined 2010. #3 · Dec 4, 2013. I know you are on a budget, but once you clean, do a valve job and mill those 243s, you will have some cash in them. You could sell them for $400 or so, get a set of Stage 1 LS6 CNC ported heads for around $1200. I just think that is fantastic bang for the buck.The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand cast. The SPM method is considered to be a more consistent process, but once you port the 862 head, any difference to the 706 head goes away. What heads are better 706 or 243? The 243 head has 2.0″ intake valves and 1.55 exh. The 706 uses 1.89 ...The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM ... these are basically 243 heads; See All 5 Photos. Vital Specs for 706 ... bert kish longmire The 806 heads are literally 1st gen heads, have a perimeter bolt pattern for the valve cover. Which means you need that cover and IIRC the coil packs bolt directly on the cover vs a bracket that holds the packs together. Flow is meh even when ported. You should look for 317 or 243/799 heads with the emphasis on the later for NA builds, if going ... pretty boy fredo death 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 . i ready path spinners Why are Chevy 706 Heads better than 317 or 862 Heads? 706 Heads Vs. 317 Heads; Most people tend to prefer 317 heads as they have improved ports, same as 243 and 799 Heads, which are more expensive. However, 317 heads have larger combustion chambers of 71.06cc, which will cost performance, especially on a naturally aspirated engine. This ...243 vs 862 Heads: Unveiling the Key Differences bhagwan vaisnav 1 August 2023 243 vs 862 Heads: Unveiling the Key Differences In the world of engine heads, the debate between 243 and 862 heads has long… madison lecroy ringlumen field stadium seating chart 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 ... best nail salon in kernersville nc Aluminum vs Iron Heads for 383 Stroker. When it comes to choosing between aluminum and iron heads for a 383-stroker engine, there are some factors to consider. ... 862 vs 706 Heads: Friendly Comparison to Find the Best; Best Cam for 5.3 with 706 Heads: Top Picks for Enhanced Performance; what gas stations accept venmo The L33 is an example and the its pistons are 4.8l piston, same part number BTW. All the later 5.3l's have flat tops and 243 heads. So the blocks are the same. The rods and crank are the only differneace. Use the crank and rods from the 5.3L and use 243 heads and have the 5.3L H.O. or L33 (well an iron block version at least). james p kacedan md An improved version of the stock LS7 cylinder heads, the LSX-LS7 heads feature a 12-degree valve angle, giant 2.200/1.610-inch valves, 270-cc as-cast ports, and six-bolt-per-cylinder bolt pattern for use on aftermarket blocks. The upper echelon of GMPP's aftermarket cylinder heads is an evolution of the C5R castings.doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp.. godzilla minus one showtimes near marcus bistroplex southridge The '02+ LS6 heads have light weight valves. how much does a good porting cost. The LS4 front wheel drive engines also have 243 heads. The LS6 heads also used the lighter Valve that are 0.6mm or 0.023622" longer, hollow stem intake, and hollow stem sodium filled exhaust valves. but the 243 head casting is the same. joann fabric vestal One popular option for 383 strokers is aluminum heads. They offer several benefits, such as being lightweight. This results in reduced overall weight, which enhances performance. Additionally, aluminum dissipates heat well, allowing the engine to run cooler.Chevrolet LS rectangle port heads need at least 4.00 bore. 5.3 and 4.8 are 3.78". LS7 heads require even larger. All 4.8s, 5.3s, and 5.7s came with cathedral port heads. Like mentioned, the square port heads were not put on any engine with a bore smaller than 4".Which factory LS cylinder head works best with a turbo, 706 or 317? It's the age-old comparison, airflow vs compression. This LS head shoot out between the s... enso supergreens discount code 5475 posts · Joined 2005. #4 · Jan 19, 2015. Put in stock 4.8 pistons, they're already flat tops and its what the L33 5.3 is with 243 heads. Stock compression on them is 9.9:1, it'll be a little higher with stock 5.3 heads but if it were me I'd go ahead and do some milled 243's with some bowl work. 2001 GMC Sierra RCSB. maxwell st days mukwonago wi I’ve been offered a 5.3 block with 243 heads on it for $300. Would the stock 243 heads work better on it than the 862 heads? Obviously they need to go to the …We may earn a commission for products purchased through links on this page lightspeed filter agent for chrome 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. super tunnel car wash rapid city I ported my 862 heads on my LM4 5.3L with a SS2 cam I haven't re run the car yet but I'm sure it made a difference up top. It feels like it pulls harder on the top end and I had to add some fuel up top so that tells you right there its moving more air. It would take quite an effort to improve the port work of the 799, less so with the 862 but ...Wanting to tax the flow capacity of the cylinder heads, we installed an aggressive hydraulic roller cam from Comp Cams. The LSR cathedral-port profile offers 0.624 lift (with 1.7:1 rocker ratio), 239/247 duration (at 0.050), and a 114-degree lobe-separation angle. The lift was slightly higher with the 1.72 roller rockers run on most of the heads.So i just bought a set of 243 heads and i was wondering if i should run them as is or have them worked a little bit (ported,polished, shaved etc.). I'm running a 220/220 .551 112 cam and ls6 intake but i dont want the heads to flow too much... and won't these heads stock lower my c/r since they have a larger combustion chamber? I haven't really dealt much with heads and what not so any advice ...]