This was an engine specifically designed to surpass the power and performance of the LS1, and it certainly achieved this goal with flying colors. In 1999-2000, LQ4s came with #373 or #873 heads that had 71cc . The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. The 799 heads have a smaller combustion chamber of 64cc, which significantly increases the compression ratio. The amazing success of this design is evident in the fact that its casting number, 243, was recycled for use on the LS2. They should have 64cc chambers. The exhaust port volume specifies the total amount of exhaust gas that can flow out of the cylinders during the exhaust stroke. Can You Trade in a Car With Expired Registration? The LS engines designed with 799 heads were 5.3L and 4.8L truck engines. Common F-body computers will work for a swap with transmission controls built into the programming, making them a cheap and easy swap for a C10 or drift rod. It is vital to note that combustion chamber size plays a significant role in either increasing or reducing the compression ratio. Aluminum is a good material of choice because it is lightweight yet durable. LS engine spec guides and LS-relatedinformationhere. Sometimes referred to as LS3 heads, L92 heads are renowned for their superior performance capabilities. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. Apr 26, 2023, 2:58 AM PDT. 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? have a cathedral-shaped intake port. 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. They are likely to bend before they break when subject to real track conditions. Any other suggestions or maybe even a specific direction to go would be helpful thank you. 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. Simply put, the Gen III is easy to swap and cheap, and the Gen IV has better heads and more complexity. The aluminum 5.3-liter truck engine has 799 heads. Summit Racing has created a series of comprehensive guides for each engine in the LS family, so engine builders and tuners can have a handy reference for their projects. With some modification, I am mating it up with a 4l60e. It is clear that the LS6 was a pinnacle in Head Design by GM. Is It a 4.8L or a 5.3L Engine?Spotters Guide. With the porting process completed, flow numbers have been measured as high as 373 cfm at .Oct 3, 2019 This impressive number is achieved with careful machining of the intake ports and exhaust ports which improves air velocity through both systems. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. I got the diameter but Im needing the length. The cylinder head gasket is one of the most over-engineered and stressed components in an internal combustion engine. This might be another good indicator on how well they work on the small-bore 5.3L. Are the 799 heads on LS1 interchangeable? The square port design reduces air turbulence, allowing for greater airflow and improved combustion efficiency along with a smoother idle and more efficient overall operation. The Definitive Guide to LS Engine Specs and LS Engine Upgrades, LC9 5.3L Engine Upgrade Guide: Expert Advice for LC9 Mods to Maximize Performance - OnAllCylinders. If you are looking for a LS-series engine to build, the Vortec-series 5.3L is arguably the best choice for the dollar. This cylinder head also has a compression ratio of 9.5:1, which allows for improved fuel economy levels without sacrificing too much power output from your engine. However, before porting, you should make yourself aware of the specifications. It is no surprise that the 317 heads made the least power. Ask your tuner what injectors they prefer and have them ready to save yourself an extra trip to the dyno. Furthermore, this cylinder head has an intake port volume of 209 cc and an exhaust port volume of 74 cc. The shape is designed to increase airflow and power. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. Why Chevy 706 Heads LS Make a Great Choice? If you need any help finding the right set of heads for your engine, contact us, and we'll be happy to assist you. The 799 LS heads have 2.00-inch intake valve. This is great news for any engine enthusiast as this means that you can swap out these heads without having to worry about making any major changes to your engine setup. Heres a table with common performancerotating assembly combinations. If you are looking for something a pretty stout and you put a 2,500 rpm converter in it (or stick), you might want to bump up to the SUM-8713. I plan on having the mill the block and heads, but would like to do the rest of the build myself. SMASH THAT SUBSCRIBE BUTTON! Air raid intake filter. The stock rockers are good up to 175 lbs. Bought a perfect running truck for 2800$. Thanks. 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. So I guess its LC9 5.3 . This record is an incredible milestone in the motor racing industry, and it truly showcases Capizzi's talents as an expert driver and racer. 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. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. Additionally, we offer a wide variety of 799 heads to choose from, so you're sure to find the perfect match for your machine. Finding 799 heads for sale can be a challenge, but you can get your hands on the perfect cylinder heads for your needs with the right resources and patience. Both the 243 and the 799 cylinder heads are General Motors 3rd generation cylinder heads designed for V8 trucks, performance engines, and SUVs. Any 799 or 243 head found on a truck had the regular valvetrain. The first order of business was to identify and round up a selection of popular LS factory heads. 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 799 cylinder head was mostly used on the L33, which is the aluminum block version of the LM7. link to Alternator Overcharging - Causes and Fixes, link to LS Head Bolt Torque Specs and Sequence. If you upgrade and depending on the injectors you run, you may need a fuel injector adapter harness. In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. Beyond that, .575 to .600 in. So lets look at the 799 heads and what makes them a nice choice for a porting job. Keep the above-mentioned points in mind when choosing the right cylinder heads. Batten, followed by several years developing performance pistons at Wiseco Piston Co. Today, Brian develops performance parts for Summit Racing Equipment and is a regular OnAllCylinders contributor. I dunno, milling to 59cc combustion chambers would be nearly 11.2 CR. Not only do they provide improved performance but also allow you to save money in the process - making them an ideal option if youre looking to get more out of your Chevy engine without breaking the bank. An electric fan kit will free up that power. You will need to replace the cam, timing chain, and timing cover to get it all to work. The exhaust port shape design is a D port which enhances exhaust flow out of your engine while minimizing backpressure buildup in your exhaust system. Additionally, this cylinder head boasts a chamber diameter of 3.876 inches, providing plenty of space for combustion and can help increase combustion efficiency when paired with other correctly sized components in your engine setups, such as pistons and rings. On the other hand, some cylinder heads are designed with the best architecture that delivers top-notch power output with increased horsepower. 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. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. You may need a bit longer of a pushrod as well. The 799 LS heads have a smaller combustion chamber of 64cc. The injectors are only 25 lbs. Still can drive daily. Description: CNC Ported LS1/LS6 243/799 Cyl Heads .650 Springs 2.02/1.59 Valves PAIR. Not only did Capizzi stun the world on Thursday when he set a new stock bottom end (SBE) record for LS Engines with his extraordinary 4.506 @ 155.70 pass during testing for the race, but he also amazed everyone present with his exemplary feat. Meanwhile, a reduced compression ratio results in a cooler burning temperature. I have a 2006 L33 and a 6 speed manual trans going into a 63 impala. Starting with an aluminum Gen IV block, Bush added CNC 243 heads, a stock GM LSA forged crankshaft, and some Wiseco flattops with 9.5:1 compression and Scat H-beam 6.125-inch rods. The 243-cylinder head is made from lightweight aluminum, which helps reduce overall weight without sacrificing power or performance. Of course, the 799 heads are designed with a cathedral shape intake port. Advanced Search Cancel . Both the 4.8L and 5.3L have the same bore yet different strokes. Plug-in programmersare easy to use but have limits. Come join the discussion about Silverados, Sierras, and other full size trucks . The 799 cylinder head was mostly used on the L33, which is the aluminum block version of the LM7. In an internal combustion engine, the compression ratio is the ratio between the volume of the cylinder and combustion chamber at their maximum and minimum values. The main difference between the two is from which mold casting the two cylinder heads originally came. The cylinder head of a vehicle is a great component playing a significant role in the superior performance of the engine. 280k miles. A lot has been unveiled about 799 heads. Would I need to change push rods and pistons or lifters? I just bought a low mileage L33 with only 53k on the clock. Im in the planning stages of swapping an L33 into an 87 porsche 944 turbo. The chamber volume on the 799 heads was within 2.5 cc's of the 706 heads, but the. The Gen. 3 aluminum block L33 engine came in Chevy and GMC trucks from 2005-07. In terms of peak flow, the 241 heads offered 242 cfm at 0.700-inch lift from the 199cc intake ports, and 204 cfm from the 71cc exhaust ports. The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. 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. Hi Rick. The best way to identify a 5.3L is the dish in the piston; the 4.8 has a flattop. 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. Your email address will not be published. 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. This new engine featured head castings that were basically a reduced-size version of the LS7, which had been fitted on an Australian Escalade model back in 2007. All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. The VVT system needs to be eliminated for aftermarket cams. 5.3L and 4.8L truck engines are LS engines designed with 799 heads. In fact, this test will illustrate exactly why you can't translate flow figures into power production. (Solved). The LC9 engines also came with 799/243 heads. Alternator Overcharging - Causes and Fixes. here are some fuel rail covers for the LS engine, but we couldnt find ones that specd the 5.3L precisely. Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. This specific guide is for the GM LC9 5.3L engine. The Dorman 615-901 has proven itself to be very close in power to the TBSS intake manifold. Just get an LQ4 literally the only difference between that and an LQ9 is the flat top pistons of the LQ9, just means you can run more boost on an LQ4! The L33 was built later, but was still a Gen. 3 engine. 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. 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. 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. The Gen III has the 24x reluctor on the crankshaft and can be run with a cable-driven throttle body and factory computer. Having tested endless aftermarket and ported stock LS cylinder heads for our sister title Hot Rod, it seemed odd that the stock stuff was never included. 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. 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. What did LS 862 heads come on? 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. I have a 2013 Chevy Silverado 1500. someone to get original picture of motor and transmission with this trim and year of truck its much appreciated. The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power. The799 LS headshave a cathedral-shaped intake port. But . The factory cam is tiny and really holds the engine back. 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. Wont really be a daily driver but a toy I can get out and turn heads with. This is because the cylinder heads come with 64cc combustion chambers. While the 243 heads were initially made for C5 Corvettes from 2001 to 2006, their popularity among LS6 engine users soon expanded beyond this. While the 799 heads offered the most flow, it was not necessarily an advantage on our test engine. The 706 heads bested the 241 heads by roughly 10 hp, but down low the 706 heads improved torque production by as much as 20 lb-ft. You need the main info about your engine components to get the right numbers. 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. We recommend that you talk to your local chassis dyno tuner and decide on a computer programmer. The material of the cylinder heads is another essential feature. Looking at the BTR Stage 3 truck cam. Cam Motion ground the cam with 223/229 duration at 0.50; 596/596 lift on an LSA is 117. The head gasket bore diameter isnt optimal, but with careful tuning and race fuel it can withstand 850+ whp. 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. My rear is set with 3.42 gears and a locker. Youll be knocking on 400 whp which is where the stock injectors max out anywayso its a fairly inexpensive proposition for the power youll be making! . ), Why Do People Cover License Plates? They have stronger wristpins, thicker ring lands, and the added valve reliefs allow you to run big cams. have an aluminum build that can withstand high temperatures. It is well known that the 799 heads have a positive effect on engine performance, as they feature smaller combustion chambers than standard engines. Though the lower compression might make them attractive for the turbo (or blower) crowd, there is a big gap in power that must be overcome before the 317s can start making more power than the standard 706s. oversize forged pistons. . Evidence will be water in the oil and sludge buildup under the valve cover. If youre gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. As you have most likely caught on by now, these two cylinder heads are practically the same. As a result, they have become some of the best performing cathedral port factory heads available on the market today. 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! It still has the same 24X reluctor ring, cam sensor location, knock sensor location etc. any recommendations would be appreciated. These engines have been praised for their sophisticated design and architecture, featuring a cathedral-shaped port and a smaller combustion chamber that allows for higher compression ratios. But on the upside, both respond equally well to porting. A set offorged pistonsshould be high on your priority list. They are okay naturally aspirated, but are the weak link with boost and you probably know a guy thats popped one. With these results it's clear that if you're after maximum performance then investing in some 799 head will give you more bang for your buck! I am also looking fo a tbss or 07 NNSB intake. any input would be appreciated. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. in this thread in this sub-forum in the entire site.
