The valves on each type of cylinder head can vary. 799 heads came on trucks manufactured around 2005 and above, as well as newer models of 5.3 and 4.8-liter trucks, come with 799 heads. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. Although an iron block 5.3 will handle more power, the L33 can still support over 850 whp. The 241 heads performed slightly better than the 317s, and the 799s were better still. 799 Heads: All About 799 LS Heads & Their Application. It is no surprise that the 317 heads made the least power. Are the 799 heads on LS1 interchangeable? The L33 crank was cast but strong. Knowing youre running high octane and having the before-mentioned 160-degree thermostat opens up the tuning window. The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. All rights reserved. The main difference between the 243 and 799 heads is that one was designed for GM engines, while the other can be used on various engines from different makes. The accessory drive will swap over, but theres a chance youll need to drill and tap one of the holes for the alternator bracket. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower. They have stronger wristpins, thicker ring lands, and the added valve reliefs allow you to run big cams. Plug-in programmersare easy to use but have limits. The best way to be sure is to use this spotters guide and look carefully at the block and heads. Of course, the 799 heads are good. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. The Gen. 3 aluminum block L33 engine came in Chevy and GMC trucks from 2005-07. Before beginning the tuning process, we recommend installing a colder thermostat to open up the tuning window. Come join the discussion about Silverados, Sierras, and other full size trucks . These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide. Both the 4.8L and 5.3L have the same bore yet different strokes. any recommendations would be appreciated. If the engine is going in a lighter car with deep rear-end gears and a high stall converter, you can be more aggressive with duration. As you have most likely caught on by now, these two cylinder heads are practically the same. It was actually the 8th digit of the vehicle identification number. So lets look at the 799 heads and what makes them a nice choice for a porting job. You also need to consider the type of vehicle you have. The 799 Cylinder Head is made from lightweight aluminum that helps reduce weight while still providing superior strength. Vin.Seventh digit is 7. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. Great article! This engine WILL be supercharged so the LQ9 looks best but so much harder to find trying to do research on supercharging a L92 is hard to find info on. LS engine spec guides and LS-relatedinformationhere. Furthermore, this combination also ensures that the engine runs more efficiently than before while still remaining within emissions standards. kind regards. The Coefficient of Discharge is a calculation of the airflow versus valve sizing, and gives a much more accurate picture of the power potential of these heads. Overinflated Tire by 5 Psi: What Will Happen? ARPChevrolet PerformanceCustom Performance Racing (CPR), Gardena, CAWiseco Pistons, Custom Performance Racing (CPR), Gardena, CA. These powerful engines could be found not only in Corvettes but also trucks and SUVs such as the truck-spec LQ9 and LQ4 that had 6 cubic centimeters larger combustion chambers. have a cathedral-shaped intake port. When running boost, you can use a water-methanol system to supply extra fuel and lower charge air temps. The extra cubes bring boost on quicker which means you can use bigger and more-efficient turbos. Some trimming of the intake and alternator bracket may be required. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. Awesome article!! Keep in mind, if youre running a cam in the 230 range, piston to valve clearance needs to be checked and fly-cutting may be required. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. What heads came on LQ4? However you seem to state that it was available until the 2011 model. If youre looking for something close to 350-400 hp at the wheels, youre in the right place. 19355573) offers 21st century big-block power with an impressive 627 horsepower at 6,300 rpm and 586 lb-ft of torque at 5,100 rpm. Today, more than 15 years later, General Motors' LS3 series of engines are still going strong and continue to be a popular choice amongst performance car enthusiasts everywhere. Like most auto parts, cylinder heads can eventually crack or fail for various reasons. Call us today. If you are contemplating a porting job, choosing the 799 cylinder heads will be wise. It is well known that the 799 heads have a positive effect on engine performance, as they feature smaller combustion chambers than standard engines. A test of the popular factory cylinder heads has been a long time coming, and honestly, we are not sure why it hasn't been done before. Yes I have seen L33s with a 799 on one side and a ls6s 243 casting on the other from the factory. Any other suggestions or maybe even a specific direction to go would be helpful thank you. Go there and search LS engines for a comprehensive collection of LS engine tech information.). By Albert, What Does It Mean When It Says Check Awd System. JOIN THE SWEAT PANTS POSSE TODAY! Any other recommendations or required mods are welcome. [Editors Note:This L33 engine upgrade guide is part of a series ofLS engine upgrade guidesassembled by a team of LS experts at Summit Racing that we are sharing at OnAllCylinders. The 243-cylinder head was mostly used on the LS6 and the LS2 engines. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. (Summit RacingsPaul Spurlock and Brian Nutter contributed to this article.). The 243 was created in a GM research laboratory, while the 799 was later adopted by other manufacturers later on. What you need is a cam that delivers a gut-punch right when the converter hits. All together, it is easy to see why these 862 heads are such a sought after choice when looking to upgrade or replace older components on your LM7 engine. Im looking for a cam suggestion to run with a a manual (Muncie M20) thss as t will d SD puns wicked at idle and snap your head back when floored. The 799 heads have been amazing on the 4.8 and 5.3-liter truck engines since inception. The intake port has a cathedral shape that allows air to flow quickly and efficiently into the combustion chamber, providing more power with less fuel consumption. In an internal combustion engine, the compression ratio is the ratio between the volume of the cylinder and combustion chamber, In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space. What heads came on LS3? The intake port volume for 799 LS heads is 209 cc. Maybe at elevated power outputs and/or boost levels where maximum flow is needed the other heads might begin to shine, but just look at the dyno results to see how well GM designed the 706 heads to work on a 5.3L (even a modified one). Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. The 209cc intake ports flowed as expected, but the 74cc exhaust ports were not quite up to snuff. 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. This can positively impact a vehicles engine performance and efficiency. WE HAVE OVER 2,000 CYLINDER HEADS IN STOCK READY TO SHIP! If you plan on running a power adder or have a long list of upgrades planned, its recommended that you take your truck to a chassis dyno tuner who can give you a custom tune. The Dorman 615-901 has proven itself to be very close in power to the TBSS intake manifold. The aluminum blocks have Siamese bores with sleeves that are bonded to the block, and other enhancements, making them durable for boosted power. Cam Motion ground the cam with 223/229 duration at 0.50; 596/596 lift on an LSA is 117. Furthermore, aside from the LQ9 which is simply a copycat version of the original LS6 design, these are considered some of best performing OEM cathedral ports ever produced by General Motors. Dont mind a little downtime? I have a 5.3 in my Pontiac Solstice. At the very least, the 317s would need more boost to reach any given power level than the 706 heads, and besides, a compression ratio of 9.5:1 works well on a turbo application. For a primer on the entire LS engine universe, readLS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family.]. Ask your tuner what injectors they prefer and have them ready to save yourself an extra trip to the dyno. The large combustion chambers were likely to blame, as the 10cc increase in chamber volume resulted in a drop of the static compression ratio by 1.2 points (from 9.5:1 to 8.3:1). Evidence will be water in the oil and sludge buildup under the valve cover. Its priced at $299.99, making it one of the most affordable high-performance cylinder heads available today. These cylinder heads feature a rectangular port design, which is also found on 6.0L truck engines and the Pontiac G8 6.0L engine. Sometimes referred to as the LS6 , the LQ4 is a 6.0 litre member of General Motors' Vortec engine family.It was first introduced in 1999 and was used for both light and commercial duty applications until it was discontinued in 2006, making way for the new generation of engines from GM's LS range. The valve stem of the 799 cylinder heads can be replaced with new ones in order to ensure high-quality performance and efficiency. The distinguishing feature of this particular engine is its cast iron cylinder heads; while all other versions have aluminum heads, the version released in 1999-2000 had cast iron ones instead. If you are looking for a LS-series engine to build, the Vortec-series 5.3L is arguably the best choice for the dollar. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in. if u wanting to save money i know u can upgrade the stock rocker fulcrums sum sells a kit.otherwise i would just contact a rep from sum to help you find the best part for you. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. The exhaust port features a D-port shape that reduces back pressure while still providing plenty of exhaust flow for increased horsepower and torque output. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. These are usually reserved for larger engines because they can handle the increased displacement and power. With machining improvements such as raised exhaust ports, increased valve size from 1.89 inch intake valves up to 2 inches, and improved combustion chamber shape for superior flame travel through the cylinder; these heads offer great performance potential at a fraction of the price compared to other aftermarket options on the market today. In fact, they can make more power than a LS6 or LS2 with boost due to the thick cylinder walls. making 310hp (235kW). Inside are ARP mains and head studs, and an M365 Melling oil pump. These cylinder heads were originally designed for various models of Chevy vehicles and are compatible with LM7, LR4, and LM4 5.3 engines. 5.3L and 4.8L truck engines are LS engines designed with 799 heads.
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