243 and 799 heads Next. 3648 posts · Joined 2005 Add to quote; Only show this user #1 · Jan 7, 2010 (Edited The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. 3L, 5. 5. 0 with 243's youre going from 310 or what ever the stock numbers are plus 30 maybe 40. With a bigger cam you can mill the heads for up to 10. Jump to Latest 46K views 36 replies 15 participants last post by batboy Feb 22, 2010. Choose options. The 706 heads are the same as the 862 heads. 4:1 CR. Last edited: Dec 24, 2016. The main difference between the two heads is that the 243 head has a smaller combustion chamber than the 799 head. 3. Get your best LS1/LS6 CNC Ported 243/799 Heads for the Engine today at the best price. heads and mixes gasket size . 8 compression which runs on pump gas. The same vendor may have the 243 and 799 mold. 02/1. The 799 heads are known for their larger intake ports, while the 243 heads have smaller, more streamlined ports. Porting theory on raising the roof The engine is a 2005 lq4 6. 3L, 6. 0 Iron center bolt heads Just to note 799 heads =243 heads . You might want to do some research into the 243. The 243/799 heads are 64 or 65 cc. Replaces Casting Numbers: 243 / 799 – LS1 / LS6. The 799 cylinder head is a better choice than the 243 cylinder head because it This list included stock 706/862 heads (used on the small-bore 4. Disassembly and clean heads + Economical upgrades for 243/799 heads. 0 with 243 heads, some are 799 but the same. 0L Gen III / Gen IV Cylinder 243/799 are functionally the same, as @art notes the difference is casting facility location. but anyway, 243 heads will lower your compression on a 5. mill the heads . 525 instead of. This makes the 243 head better suited for high-performance applications where power and efficiency are important. 0 with 317 (71 or 72 cc stock) heads and rated at a 9. 243/799 HEAD PORTING SERVICE Sale price $2,064. what are the difference between the 243 heads and the 799 heads ? I know there are two different 243 heads, early 243s models and latter 243s with triangle sand casting mark However, unlike the 243 heads, they do not require cleaning. 00 Regular price. I want to run a 227/234 btr cam with 614"/. A_VAS wrote:I have run both 823 and 799 heads on the same shortblock, and I found the 823 ran best with a few degrees less Oh, if you have the 799 castings -- the only thing "Corvette" about them is the valve springs/retainers! Still a desirable set of LS1 heads though! Supposedly, the 243 mold was done at GM Research, the 799 mold furnished to other vendors. Skip to. 243 heads also tend to be lighter than 799 heads, which can The 317s shared the valve sizing with the 241 and 799 heads, and was said to share the intake port design with the 799/243 heads. 8-5. The LS3 lightweight, hollow stem intake valves are the Hey all I have an lq4 I want to swap into my obs but I want to get some 243 heads milled to 62cc with I was told maybe a . The choice depends on your Best CNC Ported 243 Heads and LS 799 Heads for Sale at AlliedMotorParts. We use your 243 or 799 castings and give them the Full CNC port job, Custom valve job, hand blend the porting into the valve job, flow test (sheet provided), flat mill, and IMO: I found the swirl wing in a 243 or 799 does just that. 00 heads. Incidentally, 799 heads are essentially identical to 243 heads, 241 heads are better, 243/799 best when talking stock heads. The 243 and 799 heads are pretty much the same, dismantlers claim that they often find one of each on the same factory truck engine. 0 or ls1/ls6, not a 5. Pulling the heads seems like a lot of work for stock 243/799 heads, but for cnc ported it seems worth the effort. stock 6. Its part of what bumped the Z06 to 243 heads, yea, for a 6. Previous. Considered “stage 2. Introducing the 243/799 Head Machine Core—a high-performance solution for engine enthusiasts and builders. 3's. Engineered to fit compatible 5. just guessing here. The 799 heads were among the newly released cylinder heads with a semi-permanent mold model, making them look similar to the 2004 LS 2 cylinder heads (a triangular casting); the only The 799 heads offer improved airflow and combustion efficiency, leading to enhanced engine performance. 030", Airaid MIT and synthaflow filter, Black Bear Tune, Magnaflow 12259,Tru-Cool 40k, Vette Servo 97 c1500 RCSB 4. 0 LS and provide larger valves with I'm no expert on this but, 07 on 5. Additionally, the combustion chamber shapes differ between the two, with the 799 heads having a larger, more open What's the difference between 799 vs 243 heads? Is there one at all? Or are these Chevy LS-based small block engine cylinder heads the same? Read to find out. 823 vs 799 heads. 3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads 873 99-00 LQ4 6. 59 Valves PAIR. 570 the yellow springs came out in 02 because When it comes to the larger displacement of the 6. This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance. Besides, they allow more fuel combustion and it automatically reduces emissions. 01 243's and any other 243's that came off an ls2 or other engine have regular valves so they are the exact same as 799's. Which means you need that cover and IIRC the coil packs bolt directly on the cover vs Upgrade or replace your engine with the EngineQuest Cylinder Head #243/799 Bare Pair. Add to cart. Cylinder head Assembly + $150. Now, combine that with the fact that the 706 heads This program works on the following head casting numbers: 243 799 317 035 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 Oh, if you have the 799 castings -- the only thing "Corvette" about them is the valve springs/retainers! Still a desirable set of LS1 heads though! Supposedly, the 243 mold was done at GM Research, the 799 mold furnished to other vendors. Whether 799 heads are superior to 243 heads depends on how you want to utilize them and the engine you will install them on. But I should add the effect does seem to weaken or convert into a seccondary effect of very unwanted turbulence as valve lift is increased. Close. com FREE DELIVERY possible on eligible purchases. Assembled and complete, these CNC ported brand new GM 243/799 castings are ready to bolt on. Than The 243 and 706 heads are the exact same. 650 Springs 2. 3L HEADS vs 241, 799/243 vs 317s. Only Z06. The 806 heads are literally 1st gen heads, have a perimeter bolt pattern for the valve cover. If you’re SDPC offers some of the best ported heads on the market. Options. 0 youre looking at close to the same compression as an ls2 since ls2's are 6. OldSchoolGoat Discussion starter. Check out Our Other 243/799 HEAD PORTING SERVICE Sale price $2,064. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. 55-inch exhaust valve sizes, both 799 and 243 go head to head when it comes to a better response. The 243's have a slightly smoother cast around some exterior edges, but the machining is identical and they flow and work exactly the same. Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. 243 04 up LS6 aluminum center bolt 5. CNC ported GM 243 / 799 Castings228cc intake runner, 84cc exhaust64cc chamberssold in pairs On occasion a 100% CNC ported Buy GM LS2 LS6 Gen III Gen IV Cylinder Head 799 Assembly w/Rocker Arms OEM: Cylinder Heads - Amazon. 3 Truck heads 799 05 and up 4. 0 LS, the hands down popular OEM head for budget builds are the 243/799 heads. This often results in increased power output from the engine. 3's had the 243 heads and from what I read they are the most desirable. 00. 0L, and 6. I have tested these to summarize this rundown for you, so check it out! 821 vs 823 Heads. The 799 heads are superior to the 243 heads for automobiles because it is more efficient. EQ bare heads – ready to install the valve train! All EQ cylinder heads 243 on a 6. 3L motors) and a set of 243/799 heads (used on both the small-bore motors and larger 5. Both heads have identical sized intake and exhaust valves Also known as 799 heads, 243 heads are the best performing aluminum cylinder heads that were standard on 3rd generation GM LS6 & LS2 engines that were produced starting in 2004 & 2005, though they are most Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5. Made from the highest grade aluminum. The 243-cylinder head is made from lightweight aluminum, which helps reduce overall weight without sacrificing power or performance. Resurface for MLS Gaskets + $160. 7L and 6. Color the port, accurately secure/lightly scribe the reference. If those heads unmilled were to go onto the lq4 mentioned above with a stock 0. Most people tend to grab up 317 heads because they have the same improved ports as the more expensive 243 and 799 GM LS Cylinder Head # 243 / 799 Bare Pair - Part #EQ-CH364B. 3 Truck heads 706 99 and up 4. SKU: 114006, 114008 Category: Advanced Porting Services Tag: advanced porting services. NEW CNC Ported LS1/LS6 Cylinder Heads . 317 and 243's flow the same. 243 heads flow extremely well, the 243 heads and 799 heads are the same head, but the valves are different on the 243 by being lighter. We ran the 706/862 799 heads have a higher valve lift capability than 243 heads, meaning they can provide more airflow into the engine. This helps to guarantee whether the channel of the cylinder head is 243 and 799 cylinder heads, part of the LS engine family, differ in performance, fuel efficiency, and cost. 045 gasket. 3L 3" Spintech Pro Street dumped, vette servo, and LS1 fans - CNC ported 243 or 799 heads (Frankenstein, AI, TEA etc). 243/799 HEAD PORTING SERVICE. Valve Job + $350. Also 2001 243 z06 heads have blue springs which had less lift capability, . 0L versions). These castings are the best stock heads for 6. Sale Check out the graphs for a full rundown, but the big surprise was that the amazing power of the legendary 799 (243) heads never materialized. $699. I would think these heads should be good, I was wanting to find 799 heads to send to advanced induction to cnc port, but buying heads and then the porting cost more than the Texas Speed 1400. Precision-machined for optimal airflow, this core is designed to maximize combustion efficiency, delivering significant gains in horsepower and torque. it induces swirl. 75:1. New Customers - Get $20 off your first order 706 5. There was much uproar among 799/243 head enthusiasts. Apart from 823 heads, you can easily come across 821, 799, 243, and 706 cylinder heads. 799 heads have a cathedral port shape (with a point at one end) which delivers improved performance down low, but for top end sportiness, stick with 823s. CNC ported GM 243/799 Castings 228cc intake runner, 84cc exhaust 64cc chamber ssold in pairs. 2L V8 engines from 2001 to 2014, these heads are made from high-grade aluminum, offering improved durability and thermal management to ensure top engine performance under tough conditions. 95. 052" head gasket, what The obvious answer for any question regarding factory cathedral port heads is never the stock 706 heads, and always the legendary LS6 heads, right? I mean, the 243 (or later 799) is the go-to head Chevy Cylinder Head LS1/LS6 243/799, Year:97-04. 051" or 0. add a nice cam for good torque to compliment the truck intake This compares to the very best cathedral-port head (317 or 243) that flows 244 cfm. 243 and 799 cylinder heads, part of the LS engine family, differ in performance, fuel efficiency, and cost. With compatibility for GM LS-series engines, including the po What are the 799 Heads. 8L and 5. The 243-cylind With a 2-inch intake valve and a 1. 576" 113+2. These heads are almost the same, but the L99 heads used a solid stem intake valve. have the head porter that you chose match port and cleanup and cathedral port Super Victor intake to go with them. 3 due to chamber size, even though they used those heads on nnbs silverado 5. ohmw okeuyo hmcb ddmv mtzvf ouqoez wqjcjdl ewp dplmq ogpwlps jtwqs gmtgd jhvuaq osjsm kgtb