The cylinder heads are designed with aluminum materials with a 61cc combustion chamber volume. They also come with a cathedral-shaped intake port and an oval exhaust port. The 826 cylinder heads on LM7 have an intake runner volume of 200cc, exhaust runner volume of 70cc, 1.890 in. intake valve diameter, and 1.550 in. exhaust valve diameter.May 4, 2020 · C5 General - What years trucks/tahoes came w/243/799 heads - I need to scavange valve covers and ignition coils and brackets and ignition coil harness for next project. I just got for my 97 C5 243 ZO6 heads that came off from 02 ZO6 .The valve covers are perimeter bolt on mine and 243 heads are center bolt and coils...These cylinder heads feature all the benefits of the Magnum design, but step up the power potential with larger, better flowing ports. The Magnum R/T increases intake runner volume from the ...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 ...196 (Nash Design) American Motors' first straight-six engine was the 196 cubic inch (195.6 cu in (3.2 L)) produced from 1952 through 1965, initially as a flathead (L-head) side-valve, and later an overhead valve (OHV) version.. The 196 was originally designed to be an economy engine by Nash Motors, the company that merged with Hudson to form AMC in 1954.243's are LS6 heads. Those are usually the choice for porting. 241 is the stock LS1 head. Can be ported but again most go with a 243. ... Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more!The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. ... If you're gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. Yes I have seen L33s with a ...34 posts · Joined 2015. #1 · May 21, 2018. My 04 gto has full bolt ons headers, cai, slp 2.5 exhaust and already been dyno tuned. 346hp. 365tq I'm going to bolt on ported 243 heads and upgrade the valve train for the 228r cam. What would be my new hp-tq numbers?? 228-230 duration at 50 588-588 lift. 112lsa m6 trans.TEA Stage 2 Heads $1320 w/ 2.04/1.57 valves and dual springs. AI CNC Heads are $1245 w/ new stock valves and dual springs. It seems like the TEA has an obvious advantage in flow with the 2.04 intake valves but AI does not have any options for larger valves on their website.Also, all the heads have a new valve stem and can be replaced with new ones to ensure high-quality performance. All the 799 heads have a 3-year unlimited warranty. However, it is essential to ensure installation is done as per the manufacturer's instructions. Related Search - 243 heads: 243 heads specs that make it specialBeautiful apparitions in the nave of a 16th century basilica. In the nave of a 16th-century basilica in Venice, Italy, visitors saw a beautiful apparition this weekend. Conjured up...186 posts · Joined 2012. #2 · Jul 1, 2013. Disregard, just verified I have the 799's/243's from the factory. No need to upgrade, looks like i saved some coin. Valvespring kit and cam in the near future. 2021 Chevrolet Silverado 2500 HD Z71 4x4 6.6 Duramax 10sp Allison.Patriot Performance 2033: My run a total 24 degrees of timing with 93 octane. These heads provide up to a 65 cfm improvement over stock OEM versions. The 59cc chambers (achieved by milling), will increase the compression on a stock LS1 from 10-1 to 11-1. Based on other modifications, gains of up to 40 rwhp can be expected.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.If the 243 head is off of a Z06 and has yellow valve springs then it will have lightweight valves which drop valve train weight. 243 heads are better in every aspect then the 241 heads but 241 heads are not junk either. They are a good head. ┌∩┐ ( _ )┌∩┐. Man: The Mods you are fighting,LT engines were producing an output of 275 horsepower, and its successor, LS1 243 heads came with a whopping power of 345 horsepower. ... LS1 engines come with reduced proportions, and this makes it much easier to swap into vehicles even with a small engine base. They get this compact size due to the old-school pushrod design that is distinct ...Apr 26, 2018 · If you’re gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. Yes I have seen L33s with a 799 on one side and a ls6’s 243 casting on the other from the factory. There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM made.(Kitco News) - Kitco aficionados, it is now time to have your say in where you think gold prices are heading in the short-term.Read more on 'Kitco' Indices Commodities Currencies S...But keep in mind, the 241 castings have a 65CC chamber roughly, versus teh 63.5CC chamber on the 243. When using a combo like Bill's, more compression will really help and wake it up down low, even more than the normal 63.5CC chamber. We're probably going to make his 60-60.5CC's and bump him to 11.5:1.ported 243s, ls2 stock shorty + cam. procharged. 740~whp. That sounds healthy. If I can pull off 700 rwhp like that through my A4 for the time being with 234's or 317's I think I'll be satisfied. SOFAKINGGR8 said: Numbers in sig, recently made over 700whp a few weeks ago, and have been over 600whp since April.These large-runner heads have a 12-degree valve angle, like stock, and are compatible with factory LS7 rocker arms and stands. The heads can accommodate 1.625-inch-diameter springs, and several are available. A 4.125-inch-or-larger bore is required. Base price is $1,130 each, fully assembled, through Summit Racing.I did a 408 cube ls using a cathedral port head. It was the 243 casting, but I don't think there is a big difference in potential. It made good power for a pump gas street engine. Had 10.7/1 comp, …Jan 5, 2023 · The 243 vs. The 799 Cylinder Head. As you have most likely caught on by now, these two cylinder heads are practically the same. The main difference between the 243 and 799 cylinder heads is that the 243 was used on older engines from GM Research, while the 799 has been used on newer engines from multiple manufacturers.many of the factory 243's and 799's are plugged yes. You don't need the parts from your 241's, cept for the coolant sensor hole plug on rear passenger side like mentioned above. GTO parts hoarder. LsSlow Discussion starter. 311 posts · Joined 2012. #3 · Apr 4, 2014.There are many types of flat head screwdrivers. Find out more about flat head screwdrivers from this article. Advertisement The flat head screwdriver is probably one of the most co...Jan 3, 2009 · Just a rule of thumb, Most your 70's 454's will come with either the 781's or 049's unless it's a early rectangle port motor. Once you get to 1980 you start seeing way more of the 454's with peanut port heads. I won't list actual years, this is just a rule of thumb when I am looking to get a 454 core motor. 1968 Chevelle Sb.This is input only. I ran AFR 235 heads on my 408 with a BT cam and made 545 RWHP on a Mustang dyno. That was with a Fast 102, Nick Williams 102 TB, C6 type Haltech CIA, and 42lb injectors. Last edited by Last C5; 02-16-2016 at 10:27 PM. AFR, Trick Flows, Mast, quite a few options.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 2015 F-150 Ford truck standard dimensions are 243.7 by 96.8 by 75.7 inches in length, width and height respectively. The width measurement includes the length of the truck’s si...The 243/799 cylinder heads come with a 2.00" intake valve, 210cc intake runner, a 1.55" exhaust valve, 75cc exhaust runner, and it has a 64.5cc combustion chamber. The 243/799 3cc bigger combustion chamber might not seem like much but let's look at the factory Compression Ratio as seen here. And then compare it with the 243/799 cylinder head ...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.Jan 6, 2009 · To 2007 head issues #243 vs. #799. C6 Tech/Performance - 2007 head issues #243 vs. #799 - I read a thread not long ago on C6 general about a difference in the heads on the born in Oct. 06 C6's that GM used, they used #799 heads as opposed to #243 heads. The person who wrote the thread said his numbers on the dyno where …ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ...What did the 601's come on? Save Share. ... Better heads would be any of the 305 H.O. varieties that RB69SS396Conv mentions. (Basically, the heads that were used on the High Output 305's) Stock, they all have the "small-ish" 1.84 intake valves, and ~150-160cc intake runners. -601's have ~55cc chambers, -416 and -081 heads have ~58cc chambers.1400 HP POTENTIAL Assembled heads come with roller springs good up to .980 lift. Customer must supply cam specs. Machined exclusively for special T&D rockers. Valve Angle is 10 degrees on the intake and 6 degrees on the exhaust. 540 CFM potential airflow. Intake port volumes available are 400cc as cast up to 460cc fully CNC ported. Exhaust port volume is 168cc. Intake valve diameter is 2.450 ...243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications*** 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*** These are basically 243 Heads 873 99-00 LQ4 6.0 Iron center bolt headsRick@Livernois said: As others have stated, the 243 head would be a step backwards as the L76 uses the same head as a L92/LS3. Our "B" cams are typically used for forced induction. Larger displacement engines will "eat up" the camshaft and actually make it sound much more tame than a stock displacement engine with the same cam.Some of the most sought-after cylinder heads for GM s LS engines are the 243 heads. They're often referred to as LS6 heads, as they were originally used on the 2001 to 2006 LS6 engine. These 243 heads feature a distinctive D-shaped exhaust port coupled with cathedral-shaped intake ports that provide better breathing capabilities and …Jul 16, 2007 · Thanks. 853 and 241 are basically identical. 853 was used on 99-00 LS1 engines. 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.NEW GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. $349.99. 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. Add to Wishlist. Skip to the end of the images gallery. Skip to the beginning of the images gallery.243 heads are a nice upgrade on the LS1. If you want a cam that is dead stock idle, get the LPE GT2-3 (207/220) Great little cam that picks up nicely. I went 12.3 with that cam and GMPP LS6 heads back in '06. If you want to step it up a bit, an EdC 220/224 baby cam will really wake up those heads.Are you looking for a new shaver head for your Norelco electric razor? If so, you’ve come to the right place. In this article, we’ll provide you with all the information you need t...243 didn't come on 5.3s.look for the casting number on the head.get some 243s for $400 at the ls corvette forums.do a good valve job and install good springs,comp918 etc..if you have the money and know a good head porter ,port the heads.the 243s will add 20 hp .450 rwhp takes great heads and intake,a lot of supporting mods ,and the right cam.it can be done ,whats your budget.The 243 heads are factory cylinder heads that were used on the LS6 engine found in the 2001-2004 Chevrolet Corvette Z06. They are made of aluminum and have a small combustion chamber, which can result in high compression ratios.It is an aluminum block 5.3 with either 706 or 862 heads, NON DOD. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. In 07+ all the 5.3's started getting the 243/799 heads. The early years will obviously depend on what 5.3 equipped vehicle you have.I've seen 400-500 for a heads with valves/seals/springs (most likely need to change them)/retainers/locks. 243 heads from c5 z06s have the sodium filled exhaust valves and hollow intake valves. Last edited by nullpointer; 08-17-2020 at 10:07 AM. They made millions of them. 799 is the same head.Nov 5, 2017 · I think for the money the 706 is a better option. Here’s my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn’t I have a better head …The stock 348 (right) heads carried 1.94/1.66- inch valves while the standard passenger 409 heads carried 2.06/1.72- inch valves. The high-performance heads contained 2.19/1.72-inch valves, and the growth in valve size required thicker, heavier, valve springs to support the new cams with more lift and duration.The stock 348 (right) heads carried 1.94/1.66- inch valves while the standard passenger 409 heads carried 2.06/1.72- inch valves. The high-performance heads contained 2.19/1.72-inch valves, and the growth in valve size required thicker, heavier, valve springs to support the new cams with more lift and duration.All cultural and arts activities in Iran will be suspended for seven days following the death of President Ebrahim Raisi, the Ministry of Culture announced on Monday. …Mikester86 said: If I read this correctly: ". You'll notice that the Clearwater head (right) has a number cast into it between the #3 and #4 cylinders, near where the original 0331 liked to crack. The original 0331 (left) has nothing cast into that spot.". A TUPY head will have "TUPY" cast into it right there, like so:243's are LS6 heads. Those are usually the choice for porting. 241 is the stock LS1 head. Can be ported but again most go with a 243. ... Come join the discussion about performance, modifications, racing, restoration, classifieds, troubleshooting, maintenance, and more!Did the 5.3 come with 243 heads? When it comes to the 5.3 engine, it is commonly equipped with 243 heads. This has been the standard for many years and is also seen in 4.8 engines as well. For example, the LS6 engine designed between 2001 and 2006 came with these factory-designed 243 heads.The 317 heads featured ports that all but duplicated the LS2 243 heads, meaning they were cream of the cathedral-port crop in terms of airflow. The 317s did differ from the 243s in that they featured much larger (and less efficient) combustion chambers. Where the stock 243 heads featured 65cc chambers, the 317 heads featured 72 cc chambers.Jun 13, 2023 · It means there’s a drop in compression of about 0.70 when proceeding with the head swap. 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 HeadsWhat did LS 243 heads come on? The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6’s 243 heads, but had 6 cc larger combustion chambers.For this comparison, we tested the L92 heads on the SuperFlow 600 bench at Jim Grubbs Motorsports using a 4.030-inch cylinder adapter, while the LS7 head-flow numbers came from the GM Performance ...823 vs 243 heads The popular L6 243 heads have a smaller capacity (64cc), whereas the 823’s larger intake valve has a 70cc cylinder, promoting better overall flow within the combustion chamber. In addition, there’s some controversy among gearheads about whether the “swirl” ramp added to the 243 to improve fuel and air mix in the ...Apart from 823 heads, you can easily come across 821, 799, 243, and 706 cylinder heads. I have tested these to summarize this rundown for you, so check it out! 821 vs 823 Heads. Basically, this couple has the same structure yet different valve and spring technology.Researchers have discovered abundant colonies of mycobacterium in residential shower heads. HowStuffWorks takes a looks and offers a quick fix. Advertisement Taking a shower should...I’ll give ya threefiddy, a jar of Vegemite and a box of boomerangs that may or may not come back. -- Olly. ... thats what the guy who did my heads did...scanned the as cast 243 and then started programming... 2005 GTO QSM,418" NaturallyAspirated,Bullet Racing cam,243 heads,6speed,Kooks 1-3/4" headers w/cats,matchported FAST …The low lift numbers really played out in the torque curve with this combination, as the L92 heads and L76 intake helped the LS2 stomp out 494.9 lb-ft of torque at 5,000 rpm with a very wide ...Originally Posted by silverz28camaro. the 853 heads are stock from 98-00, then they had the 241 head which was pretty much the same head. If you find a 243 head then you are in business they are the ls6 head. If the 853 you have now are ported then you may have something. Take pics of the intake ports and post them up.The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. The LS6 cam is the most aggressive cam GM put out for cathedral port headed ...823 vs 243 heads The popular L6 243 heads have a smaller capacity (64cc), whereas the 823’s larger intake valve has a 70cc cylinder, promoting better overall flow within the combustion chamber. In addition, there’s some controversy among gearheads about whether the “swirl” ramp added to the 243 to improve fuel and air mix in the combustion …They ported my fast and 243 heads with there 226cc cnc program. Car was makin around 435 before and previously ran a 10.93 Now with 480/410 I cant wait to see what this thing will do now. Hopefully get close to the 2nd fastest 346 NA car this year. We will find out soon. Reply Like 02-07-2012, 10:28 PM ...The 243 heads were installed on the LS engine, which was produced from 2001 to 2006. It was formerly used in the C5 Corvette but has now been ported to the …No 243s or 799 have the casting defect that I've heard, it was pretty isolated to the castech only 706's on gen III 4.8/5.3's. There are 2 other sets of 706's that are not affected. The early sand cast heads come as 862s and 706's, and a die cast 706 that isn't made by castech. 16 posts.LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's.243's are capable of great hp and tq...485rwhp/431rwtq is pretty good..he's got a cam according to video if im not mistaken... ive seen results of AI's 243 cylinder heads on stock cube/cammed LS2's make close to that...as far as hand porting goes if someone has got tons of experience doing it they ARE able to run with CNC'd heads...all you had was handporting in the old daysApr 28, 2013 · 2004 GTO M6, 243 heads, 224/228 TSP cam, Svede intake, JBA Shorty's Catless Mids 383HP/376TQ Whiteline RR bushings, Rear Sub frame, Diff inset and trans insert. Save Share. Like. ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums.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. We ran the 706/862...799 vs 243 heads. Looks lke they came across a bunch of them as they are listing on ebay also. After searching today seems like a truckload became available all of the sudden. From what I can find on the truck forums these are the same as 243 heads without hollow valves or sodium filled I think it was.A properly ported set of 243 heads, and more compression really help. 2004 GTO Phantom Black M6 06 Brake setup, Maverick coil overs, Hawk HPS pads, BFG Comp2s, AI 243 heads, Ghost cam, TPiS LS6 90mm TB mount, UDP, Svede1212 OTRCAI, Kooks Signature Series LTs with cats, Gforce anti-hop axle, SAP grilles/fascia, Banshee hood ... Come discuss mods ...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.It's a 2004 A4 LS1. Lots of good info here. I can't seem to find much on these 843 heads except they're older than what comes with my car. A friend of a friend is looking to sell them to me for $1000. He said they're used off an older corvette, cnc'd on intake exhaust and combustion chambers, new stock valves with 3 angle valve job, ls6 yellow ...GM LS6 (243 casting). Information needed…799 Vs 243 Heads: Main Feature Comparison. Though the 799 and 243 cylinder heads are similar in many ways, you can see from the table above that there are slight differences as well. But does it mean they perform differently? Well, the only way to find that is to compare the important features first. In the following part, I have compared some .... 799 Vs 243 Heads: Main Feature Comparison. Though the 799 and 243 cGM Engine & Exhaust Performance - lm7 with 243 heads 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 … Feb 13, 2020 · 706 heads are very affordable. 706 heads are I had a close friend of mine hand port my 243 heads. After a re tune I ended up with about 25whp and 30wtq out of them. Im really happy with the results! Save Share. Like. ... I’ll give ya threefiddy, a jar of Vegemite and a box of boomerangs that may or may not come back. -- Olly.243 heads with AFR dual springs from '06 GTO. Seats, retainers and seals are not included. - SOLD!! plus actual shipping. in this thread in this sub-forum in the entire site. Advanced Search ... Come discuss mods, horsepower, engine specs and more! Full Forum Listing. Explore Our Forums. 6000. HO 6000 engine in a 2003 Cadillac Escalade EXTTh...
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