. The LS engines designed with 799 heads were 5.3L and 4.8L truck engines. The exhaust port volume specifies the total amount of exhaust gas that can flow out of the cylinders during the exhaust stroke. According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. 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. The 706 heads were simply better than the 799 heads through most of the curve. [Trying to find an LS engine for a swap or build? Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. The chamber volume on the 799 heads was within 2.5 cc's of the 706 heads, but the dyno indicated this did not translate into power on our test engine. The stock rockers are good up to 175 lbs. It's also important to note that when utilizing head porting services, it's possible to customize the size of each port for optimal results depending on what type of vehicle you have and your particular needs. The increased chamber volume of 6.5 cc's dropped the compression ratio by nearly 0.80 points. This specific guide is for the GM LC9 5.3L engine. 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. The L33 is a returnless system. After reading these recommendations, I cant stop grinning. The 243-cylinder head is compatible with OHV (overhead valve) engines as well as 16-valve engines (2 per valve). Keep the above-mentioned points in mind when choosing the right cylinder heads. Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. The 799 cylinder heads are in the similitude of the 2004 LS2 cylinder heads due to the triangle casting marks similarity. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in. The head is designed for use with four cylinders but can be adapted for use with up to 6 cylinders if necessary. This is the test everyone wanted to see, and the one every LS owner will be talking about. The cylinder heads intake port and exhaust port shapes are cathedral and D-port, respectively. Hi, im going to put a L33 in my 1973 C10 shortbed. Check out the dyno graphs to see how much the 317s lost on this 5.3L test and you might think twice about what you choose for your next turbo LS. Stay away from the LS4 from front-wheel-drive cars. Plug-in programmersare easy to use but have limits. 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. It is important to understand the differences between 243 and 799 cylinder heads, as they are two of the most popular cylinder head options for a Chevy. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. A 205cc runner head is a good match with the TBSS intake. The question now is where that limit occurs. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. These are best for high-compression builds and really need larger valves and porting work. 799 Heads: All About 799 LS Heads & Their Application. Of course, the question now is how would the four heads act under boost where the additional flow required might tax the maximum flow potential of the small-valve 5.3L heads? Its V8 configuration also provides an efficient combination of power and fuel economy, so you wont have to worry about breaking the bank when refueling after a long day out with friends or family. The cylinders can be bored to the LS1/LS6s 3.905 inches, but its recommended that you leave them as thick as possible with common .020 /.030 / .040 in. 799 heads are known for leaping power output by 3 to 4 percent, which automatically leads to a horsepower boost up to 25 hp. Would I need to change push rods and pistons or lifters? Remember, a 4-corner steam kit reduces hot spots that cause the rings to butt and snap the pistons ring lands. Although the cylinder heads were made originally for the 3.90-inch bore, they fit perfectly on 5.3L and 4.8L blocks (3.78-inch bore). 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. For fun, he runs his 427-powered C5 Z06 in ECTA land-speed racing, at OPTIMA street car events, and at a mix of autocross, drag racing, and track days. Keep in mind, if you're running a cam in the 230 range, piston to valve clearance needs to be checked and fly-cutting may be required. Of course, the 799 heads are designed with a cathedral shape intake port. The 243 and 799 cylinder heads are practically the same, with only minor differences in port and valve sizes. The exhaust port volume for 799 LS heads is 74 cc. As such, they offer an impressive increase in power output of up to 25 horsepower when compared to other similar truck engines on the market today. So I guess its LC9 5.3 . kind regards. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). It also has a 7 for eigth number of Vin in my 2012 Silverado. Hi, Im looking at putting an L33 into a Barbarian V8 motorcycle custom built to take an LS engine, it will be married up to a single speed direct drive gearbox, will not be able to use its usual intake due to space under the fuel tank so what would be the best lowest profile intake/throttle body unit I could use without sacrificing performance, what would the best cam to use given the direct single drive, like the lumpy sound yet be a daily driver, Frame in transit at the moment so just looking at a direction to go with its powertrain. Trans computers were external early on and switched internal later. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow. Learn how your comment data is processed. Daily driver with a above average cam. With its aluminum construction, this assembly boasts maximum heat dissipation while still providing a lightweight design that won't bog down your engine's performance. 799 heads on 5.3 engines are a perfect fit. Usually about 7.425, but we recommend the use of a length checker before ordering just in case. Aug 27, 2022 / Condition: Remanufactured - Exceeds OEM Specifications. Ultimately, its up to you to decide which cylinder head best suits your needs. You can make 700+ hp with a couple of simple upgrades like head studs and LS9 head gaskets. What heads came on LS3? With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. Bore 3 = 2.307 in. Are the 799 heads on LS1 interchangeable? When ChatGPT was released to the world in November, most of us marveled at its ability to write rap lyrics and cover letters and high-school English essays. Whether youre towing on low-octane or springing for good fuel, a tuner can dial-in the ECM and take it to the next level. Although there was only a 2.5 cc difference in chamber volume between the two models, this did not result in an increase of power on our test engine when evaluated on a dyno - suggesting other factors are also important to consider when assessing performance potential. Any 799 or 243 head found on a truck had the regular valvetrain. Great article! The DOD, later called active fuel management (AFM) bungs, will be obvious on the Gen IV engines. Below are some more upgrades you can make to improve the performance of an L33. This was coupled with a 3.876-inch chamber diameter. This E-Rod crate LT1 is from Chevrolet Performance. Although an iron block 5.3 will handle more power, the L33 can still support over 850 whp. This was an engine specifically designed to surpass the power and performance of the LS1, and it certainly achieved this goal with flying colors. The aluminum blocks have Siamese bores with sleeves that are bonded to the block, and other enhancements, making them durable for boosted power. It is no surprise that the 317 heads made the least power. isnt a problem with dual valve springs. The smaller combustion chambers help to reduce the compression ratio, which in turn boosts combustion efficiency for increased power output. NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. I HAVE A 2011 SUBURBAN LT Z71 4X4 AND IT HAS THE LC9 WITH 799 HEADS. Something to keep in mind is the 2004 and later engines (even Gen. 3) had two head bolt lengths vs. three on the earlier engines. Vin.Seventh digit is 7. The result: increased horsepower with improved fuel efficiency. Usually found in GM trucks, the LS engines with 799 heads come in two sizes: 5.3L and 4.8L. However, you may also find some heads made from cast iron. Sometimes referred to as LS3 heads, L92 heads are renowned for their superior performance capabilities. These volumes are larger than most other heads available, allowing more air to enter the combustion chamber and be expelled through the exhaust pipe, resulting in increased power output while reducing fuel consumption. My 5.3 came with 862's, and my chambers are 61 cc. It was found that the 799 heads were superior, offering as much as 20 cfm more than the 706 head at some lift points. The 5.3L uses a Roll Master billet timing set with a Torrington bearing, and an LS2-style chain damper. However, when it comes to performance, both cylinder heads are interchangeable and will provide the same power output. However, some cylinder heads come with an architecture that hinders the engines power output. 706 5.3L Truck Castings Valve size: Intake- 1.89, Exhaust-1.55 Port Volume: Intake- 197cc, Exhaust- 69cc Combustion Chamber: 61.5 cc Benefits of Casting Chevy 706 Heads Most affordable, powerful, and effective Superior to 862 heads in reliability and performance Flow is excellent and superior to 317 heads, suitable for many builds Single turbo systems using. I like the idea of 100 hp with a BTR 550 lift it has 799 heads but was thinking AFR mongoose with upgrade trunion and springs. Looking for 400+ hp at the wheels naturally aspirated? Stumbled across a 2005 ext cab Silverado. The L20 4.8-liter engine had an A on the VIN. This automatically leads to inefficient combustion with reduced power output. 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. Your email address will not be published. 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. First, you want to avoid the Gen III heads with the "battery" castingthey are crack prone. Furthermore, this combination also ensures that the engine runs more efficiently than before while still remaining within emissions standards. An increased compression ratio results in more power output. As such, they are a great choice for those looking to get more out of their engine with minimal effort. This helps to reduce the compression ratio, resulting in improved combustion efficiency and increased power output. 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. Drop a LIKE if you LIKE! There is some debate on iron vs. aluminum from a power standpoint, but the reality is the internal rotating parts are going to fail before the block does, so if you can score an aluminum block, take the weight savings. RPO code in glovebox listing LC9 confirms it. It is the Lt model and the 8th character of the VIN is 7. As a result, they have become some of the best performing cathedral port factory heads available on the market today. Which came out in the 2014 model years. Scroungers are known to CNC port the 862/706 heads to get them to outflow the more expensive Gen IV 243/799 head. Inside are ARP mains and head studs, and an M365 Melling oil pump. Whether you are looking to upgrade your current vehicle or build something from scratch, the LSX 454 can provide the power and durability that you need for success on any road or track. Not knowing it is a vin(b) 5.3 l33ho. [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 Definitive Guide to LS Engine Specs and LS Engine Upgrades, LS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family - OnAllCylinders, https://www.summitracing.com/parts/icb-551353, here are some fuel rail covers for the LS engine. In 2008 and 2009, Chevy also had a simpler 5.3L engine designated the LH8, which can be identified by the letter L in the 8th digit of the VIN. CNC Ported LS1/LS6 243/799 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR, Chevy Cylinder Head LS1/LS6 243/799, Year:97-04, Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04, NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. 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. I forgot to add I will not be using boost and what would be the best fuel rails and injectors? It proves beyond doubt that Capizzi has what it takes to compete at even higher levels and be successful in any challenge or race he enters into! One of the better factory LS heads you can find in a junkyard. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. At best, flow numbers indicate potential power, but we are getting ahead of ourselves. If you're uncertain, here are a few factors to consider before going for 799 heads. Bore 1/5 = 2.346 in. In fact, this test will illustrate exactly why you can't translate flow figures into power production. This is because the cylinder heads come with 64cc combustion chambers. Some may think that a camshaft designed for the 5.3L engine would be tuned to produce maximum power at low rpm and lack pull up top, but this was not necessarily the case with the LM7 cam. Since these cylinder heads come with a smaller combustion chamber size than other options, you will need to mill them down a minimum of 0.025 inches in order for them to fit properly in your engine block. Until we find that out, all hail the mighty 706 heads. Advanced Search Cancel . The intake is the factory Gen IV truck manifold and will be run using a stock computer and HP Tuner software. The cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. Porting and polishing help improve airflow by opening the intake and exhaust ports. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. The upgrades included a 58x crank trigger wheel with the cam sensor moved to the timing chain cover. I like the sum-8712 cam idea, but my issue might be keeping it under the hood. The LM7 cam is still a great choice for those who are looking to extract maximum low-speed grunt from their 5.3L engine as it will provide smoother throttle response and more usable power across its entire operating range than many other designs on the market today. have an aluminum build that can withstand high temperatures. They will have better cylinder heads and floating piston pins, so they are reusable for a good low-budget build where you throw a cam, studs, and boost at the engine. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower. But on the upside, both respond equally well to porting. As stated above they are the same as 243 heads with a different casting method. Im putting an L33 with factory 799s and an LS6 intake with a DBC T/B in a 2000 zr2 s10 44 (4000+lbs curb weight) with a 70mm turbo. after bottom dead center and alter the intake valve opening to set the idle quality. With some modification, I am mating it up with a 4l60e. If you are considering a porting job on your vehicle, 799 head is a perfect choice, at least for the guaranteed power output that results from the kind of intake port it features. The size of the valves affects the performance of an engine. The 5.3 "LM4" is what I have in my Rainier and it had a short production run and was used in the 03-04 GMT360 vehicles and the SSR. Some of the most cost-effective and powerful heads available for 5.3L, 4.8L, and even larger 6.0L LS engines are GM's 706 Vortec heads. . The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. Given the minimal difference in flow and lack of power production, the 241s don't seem like much of an upgrade over the 706 heads. Take your time and compare your options before making a decision. It connects the intake manifold with the cylinder heads. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. It is an aluminum block. And for $90 why not. The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. What made the 317 heads both kissed and cursed was the combustion chamber size. If you upgrade and depending on the injectors you run, you may need a fuel injector adapter harness. The 243 and the 799 cylinder heads are practically the same. Torque limiting can be completely shut off, shift points can be raised and it makes it easier to tune for a bigger cam and injectors later on. On the left is a Gen IV, on the right is the Gen III. Bore 2/4 = 2.326 in. The 799 heads have a smaller combustion chamber of 64cc, which significantly increases the compression ratio. The Gen. 3 aluminum block L33 engine came in Chevy and GMC trucks from 2005-07. 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.

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