What did 243 heads come on
since then ive dropped in the HKE 408, reworked the 243 heads, stepped up to 1 7/8 stepped to 2" headers and true dual 3" exhaust through an x pipe. before it was a 1 3/4 header with single 3" exhaust. also went from 4.10 gears to a 4.30 and stepped the converter from a 3600 to a 4400. also the addition of another kit for a total of 250 instead ...Usually, conventional small-block heads did not flow nearly as much air as the best factory cathedral port heads. The 243, 799, and 317 castings of these cathedral port heads could flow up to 250 cfm which was a major improvement over what preceded them. But the LS3 heads took this concept even further and were capable of an impressive 317 cfm.
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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 heads. 317 01 and up LQ4 and LQ9 6.0 aluminum center bolt heads. 035 01 - 04 LQ9 6.0 aluminum center bolt heads. Even more detailed info: Casting Numbers 241, 806, 853.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 …I wonder if the Edelbrock head was an LS1 or a 5.3L specific head. The bore difference of the LS6 to the 5.3 liter motors is 99mm vs 96.01. 3mm diameter is only 1.5mm smaller from the wall to the valve. I know it will shorud but the test showed it worked. The engine ran on an engine dyno and ran well.The LQ4 (4.8 liter, 293ci) is the smallest LS ever produced. It shares its iron block with the 5.3-liter engine and even has the same 3.78-inch bore size. The drop in displacement comes from a ...Welcome to Chunyun, the time of year in which 3 billion Chinese travelers head home for the Lunar New Year. In the spirit of the long-standing Chinese tradition of spending the Lun...I wonder if the Edelbrock head was an LS1 or a 5.3L specific head. The bore difference of the LS6 to the 5.3 liter motors is 99mm vs 96.01. 3mm diameter is only 1.5mm smaller from the wall to the valve. I know it will shorud but the test showed it worked. The engine ran on an engine dyno and ran well.The LC9 came in GM trucks and SUVs in 2007-‘11 and made 315 horsepower right out of the box. It’s a Gen. 4 5.3L aluminum-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.No modifications to do a head swap, but if both are stock untouched heads the 241s have a 66cc chamber versus the 243s 64.5cc chamber. A slight bump in compression, but it shouldn't be an issue. I believe after 07, all 5.3 engines have 243 heads. Now that you're swapping heads, you should consider getting them ported beforehand. KerryThe LS2 is a Gen. 4, 6.0L, aluminum small block engine. The engine specs and information listed here is for the stock LS2 used in GM passenger cars from 2005-2007. 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 ...Last updated on 05/06/2024. 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 …How much do 243 heads weigh? Which heads are better 706 vs 862? Are 799 heads the same as 243? How much HP can 706 heads handle? What did 823 heads …The 4.8L engine is also known as the Vortec 4800. The engine specs and information here is for a stock LR4 engine. 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. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on ...64nailhead. 4523 posts · Joined 2012. #5 · Jun 13, 2020. Here's your decision - the 317's will work better if you're looking for boosted 1000+ HP, but the 243's will work better everywhere below that. Something to keep in mind, old school SBC and SBF static and dynamic compression ratios do not apply to LS heads.Scoring a 4.8 or 5.3 with 243 factory heads tomorrow. It's out of a 2007 Tahoe. I've been told that 4.8s didn't come with 243s only the 5.3s? Can anybody verify? I'm only paying $150 for the whole thing so I'm pretty happy. Also, is there a way without the vehicle vin to identify what it is...The base heads come with factory valvesprings, with three different upgrade options. All Stage 1 heads have factory valves and are milled and assembled according to owner specifications. Only new “317” cores are used for the larger chambered 6.0-liter casting, and “243” or “799” cores are used for the LS6.I have a lq9 .020 over, 243 heads, headers, gen 4 intake, btr stage 3 v2 truck cam. You can probably take my spark table and subtract 2* globally to get you started. I would say you could steal more than the spark table and get a good start for your setup. Sweet thanks. Most of the tune is good to go, just the timing had me chasing my tail.Equipped with the 317 heads, the turbo 6.2L produced 807 hp at 6,800 rpm and 747 lb-ft of torque at 4,900 rpm. The boost pressure peaked at 7.6 psi, before dropping to 6.9 psi at 7,000 rpm. The ...
Exhaust flow at .600" - 180 (241) / 183 (243) The 243 heads have a D-shape exhaust port that improves flow and came with higher lift valves springs. Both heads came with 2.00" intake valves and 1.55" exhaust valves. To my understanding, this is all the difference. Last edited by R6cowboy; 02-26-2011 at 01:52 PM.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 ...I knew the flow was the same just didn't realize gm put the 243's on the 5.3's. I better look at the driver side because I remember GTO's and vettes with 1 - 799 head and 1 - 243 head on the other side. My LS6 has 10.5:1 with 243's and I love it. The 09' has great response also eventhough I haven't tuned it yet. 97 GMC, 2002 LS6.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 243 but you'll have better compression vs 243. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. They'll never be rock stars but they'll do fine with that cam.
Mar 21, 2012 · 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 ...26791 posts · Joined 2006. #7 · Apr 13, 2010. 243's for cath ports and l92s for sqaure ports.. i would say are the best lower budget heads from what i understand that came on stock motors..a 6.0l comes with 317s which are the same as 243s just with a larger combustion chamber..if you want to use boost use them..the 243s are an ls6 head and ...Auto Parts Blog. 243 heads: 243 heads specs that make it special. By TheAutoly Team. 243 heads. Last updated on September 6th, 2023 at 04:12 am. ……
Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. The LS3 head at 265 cc of volume compared to 214. cc for the 243, . Possible cause: Just Porting is not always a good idea. but having proeprly ported heads to.
Jun 3, 2022 · The 243 heads come with 1.7 - ratio rockers responsible for opening and closing the intake and exhaust valves. The configuration is different from the 1.8 ratios found on most other LS heads. The main benefit of this is that it allows for greater lift, which results in more airflow and more power.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 ...LS1 LS6 243 / 799 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads. $599.95. Options. Valve Job with new Valve Guides + $400.00. Resurface for MLS Gaskets + $150.00. Cylinder head Assembly + $150.00.
Get the LS3 heads since they come with valves actually geared toward performance. You can either have a machine shop mill the heads .030 to maintain stock compression, or you can select a piston that will bring compression to where you want it. Milling is cheaper. Grab a ported LS3 intake, injectors, and fuel rail, and you are set.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.It includes a new ported/blueprinted LS6 oil pump, LS7 lifters, lifter buckets, LS2 timing chain, and GM MLS head gaskets. I will order the pushrods once I measure for the correct length. Already purchased a 25% underdrive pulley. ARP heads bolts, header bolts, and balancer bolt. The LG headers already come with GM exhaust gaskets
We may earn a commission for products purchased through The first has to do with port shape. The LS6 and the later LQ9-LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled ...I have a lq9 .020 over, 243 heads, headers, gen 4 intake, btr stage 3 v2 truck cam. You can probably take my spark table and subtract 2* globally to get you started. I would say you could steal more than the spark table and get a good start for your setup. Sweet thanks. Most of the tune is good to go, just the timing had me chasing my tail. The main difference between 799 and 243 heads is the amExTurbo. 6593 posts · Joined 2006. #16 · Sep The 882 head is the most produced chevy cylinder head over and above all other casting numbers. They were produced in the millions and if you are rebuilding a 70's era 350, more than likely it will have a set of these heads on it. There are different variations of the 882 head, which has been stated already. NEW GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. $34 78 posts · Joined 2009. #11 · Jul 19, 2010. The 2 popular heads are 243 &799 heads for the ls1.Either head will add about10- 20hp to the wheels. mods=stock 243s,85mm typhoon intake&tb,pacesetters&catless mids,85mm ls2 maf,svede otr,predator 224/231 cam,42# inj. and aComplete Street Performance dyno tune= 415/386.I've also decided to go with the Flowtech Induction ported 243 heads with stock valves. The cam will customized around those heads and my goals/usage. Won't end up having Ed do the port work till November or December, but can't wait to get the cam and see what he's come up with. Jun 13, 2015 · The early 5.3's had eitherNot the hollow/sodium filled valves found inThe LMG engine is a 5.3L Gen. IV iron-block engine used in GM truc Not the hollow/sodium filled valves found in the 02-04 Z06. With a decent size camshaft, you will need to purchase another set of valvesprings for $250. So that would bring your total to $750. For only $500 more, you can have a set of Patriot CNC ported 243 heads assembled. That's going to be a good gain in performance for just a little bit ... PRC 2.5 243 heads. Jump to Latest ... (ultimat Suicidal Racing. 26755 posts · Joined 2006. #6 · Jul 31, 2012. Maybe its me an how i keep reading it..but it seems you think 317s flow more then 243s or 799s...they have the same ports as a 317..,317 just has a larger chamber 72 or 74cc vs the 243/799 64cc... some 5.3s have 799 heads stock.not sure on yrs though. I wonder if the Edelbrock head was an LS1 or a[SW LTs, SW Cat Back, HPE S-Cam, 243 HeadsWhat did LS 243 heads come on? Sometimes re 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 ...