For those seeking uncompromising quality from their vehicle upgrade parts, the GM LS3 L92 6.0L 6.2L Cylinder Head Assembly 821 Square Port Genuine OEM is sure to deliver superior power without compromising on safety or longevity. With some modification, I am mating it up with a 4l60e. Both the 243 and the 799 cylinder heads are General Motors' 3rd generation cylinder heads designed for V8 trucks, performance engines, and SUVs. Trans computers were external early on and switched internal later. It is an aluminum block. This further improves airflow and power output from your engine without compromising efficiency or torque production levels. Great article! Want to dress engine up. For marketing purposes, it was also known as the Vortec 5300. Advanced Search Cancel . It was found that the 799 heads were superior, offering as much as 20 cfm more than the 706 head at some lift points. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). The 799 Cylinder Head has an exhaust valve size of 1.55 inches and an intake valve size of 2 inches which are both slightly larger than many other commonly used cylinder heads on the market today, allowing for better airflow into your engine without sacrificing performance or reliability. The 799 cylinder head distinguishes the 5.3L from other engines due to the compression ratio. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. The 799 LS heads have 2.00-inch intake valve. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. Drop-in .500-in. These are best for high-compression builds and really need larger valves and porting work. The L33 swap is a pretty common one as LS1s are getting hard to find. ull have to use the ecm from the 2012 and u may have to change ur fuel pump but not sure on the fp but poss about the ecm.u may call the dealer or summit and ask to b sure. Mechanically similar,General Motors LS and LS-based Vortec engineswound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buickheck, even Saab, Hummer, and Isuzu got some LS love. 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. Flat Top (2007-09), Flat Top with valve reliefs (2010-11). 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. 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. 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. Easy Guide, Symptoms of a Dead Cylinder (Causes and Repair Cost), 2023 Car, Truck and Vehicle How To Guides - Vehicle Freak, Do Motorcycle Exhaust Need Baffles? You can find moreLS engine spec guides and LS-relatedinformationhere. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. 2007 5.3 with 862 heads? - ls1truck.com As expected, the 799 heads offered the highest peak flow, with 250 cfm coming at 0.700-inch liftthough a value not generally relevant to most LS enthusiasts. It was actually the 8th digit of the vehicle identification number. Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. This is Nate Bush's 5.3L long-block build from Custom Performance Racing (CPR) that can handle more than 1,000 RWHP on boost. We recommend a dedicated truck cam. 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). 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. One of the better factory LS heads you can find in a junkyard. These are usually reserved for larger engines because they can handle the increased displacement and power. The valves are responsible for letting air and fuel into the cylinder and the exhaust from that combustion out of the cylinders. 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. wall tool-steel pins is a good idea. lift cams are popular, but LS6 springs allow you to run .550-in. They are built with sophisticated architecture, including a cathedral-shaped port with smaller combustion chambers. 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. Required fields are marked *. On the other hand, some cylinder heads are designed with the best architecture that delivers top-notch power output with increased horsepower. This is the test everyone wanted to see, and the one every LS owner will be talking about. Rebuild engine? It is going to face "all the boost," which means 35 or more pounds making 1,000 lb-ft to the tires. The issue with milling them is you will have to remove quite a bit of material which can cause alignment and sealing issues with the intake . These cylinder heads were originally designed for various models of Chevy vehicles and are compatible with LM7, LR4, and LM4 5.3 engines. 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. 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. Valve Size: Intake - 1.89, Exhaust - 1.55, Port Volume: Intake - 197 cc, Exhaust - 69 cc, Chamber Diameter (distance across): 3.756, Valve Size: Intake - 2.00, Exhaust - 1.55, Port Volume: Intake - 199 cc, Exhaust - 71 cc, Chamber Diameter (distance across): 3.821, Port Volume: Intake - 212 cc, Exhaust - 76 cc, Chamber Diameter (distance across): 3.923, Port Volume: Intake - 209 cc, Exhaust - 74 cc, Chamber Diameter (distance across): 3.876. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. I would also like to keep my 799 heads as well. So, in the debate of 799 versus 243 heads, it can be determined that they are completely identical and interchangeable with one another. The 799 head cc is pretty smaller compared to some others. 799 heads on 5.3 engines are a perfect fit. 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. You will want to install a trunnion kit for added reliability. The exhaust port volume specifies the total amount of exhaust gas that can flow out of the cylinders during the exhaust stroke. After reading these recommendations, I cant stop grinning. 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. Aki Ito. 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. When testing the 5.3L heads, the 706 and 799 heads were compared to determine which offered the most flow. (Is It Bad to Remove Them? The block is 80 pounds lighter than the iron version. If youre asking, how much are 799 heads worth? The cylinder heads offer one of the best flows you can get from top-notch cylinder heads in the automotive industry. Go there and search LS engines for a comprehensive collection of LS engine tech information.). If I keep my original crank and have the block bored .020 over with new pistons, do you think I could do enough modifications to the crank, intake, and heads to get this kind of power? Not really an expert, Your email address will not be published. The valve stem of the 799 cylinder heads can be replaced with new ones in order to ensure high-quality performance and efficiency. You need the main info about your engine components to get the right numbers. 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. The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. For example, Corvette Z06 models feature 243 heads with sodium exhaust valves, which is typical for an L6 engine. my 64 impala has a drop out 06 GTO LS2 W/4L65E and its awesome so hoping this L33 would give me same results in the 67? 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. 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. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. It also has a 7 for eigth number of Vin in my 2012 Silverado. 799 heads (65cc chamber and 210cc intake runner) are pretty much 241 LS6 heads worked over for truck. ICT billet offers an idler location kit (part number ICB-551353 https://www.summitracing.com/parts/icb-551353) which allows a car intake to be used with the truck accessory drive. We loooove V8 Sky/Solstice swaps. The sophisticated architecture with a cathedral-shaped port allowed 799 heads to offer amazing performance on truck engines. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. The cylinder cast architecture is with a semi-permanent mold method. 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! If it's not done correctly, it can decrease performance. In addition, the 799 heads deliver increased power output on the 5.3-liter truck engine. The injectors are only 25 lbs. Therefore, regardless of which head you choose, you will still receive maximum power from your engine. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. This can positively impact a vehicles engine performance and efficiency. At Allied Motor Parts, we provide 799 LS heads for sale to customers who only want the best for their engines and do not compromise on quality or performance. The L33 crank was cast but strong. The #799 cylinder heads are reportedly the same casting as the LS6 and LS2 #243 heads, minus hollow exhaust valves and high-performance valve springs. This might be another good indicator on how well they work on the small-bore 5.3L. What made the 317 heads both kissed and cursed was the combustion chamber size. 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. Welcome to rxmechanic.com. Wanting to go with 5.3 since its a bit cheaper and dont care that Ill be loosing performance. 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. 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. The 243-cylinder head is compatible with OHV (overhead valve) engines as well as 16-valve engines (2 per valve). The 243 and 799 numbers reveal the original molds out of which these castings were constructed. 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. It also boasts a high thermal conductivity rate which helps keep temperatures low during operation. To put it simply, Chevrolet Performance's LSX 454 crate engine is a powerhouse. Or they had them in stock at the factory and used them till they were gone! 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. Any 799 or 243 head found on a truck had the regular valvetrain. This reduces expense when you build it up. Is It a 4.8L or a 5.3L Engine?Spotters Guide. 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. This top-of-the-line cylinder head assembly offers increased performance without sacrificing reliability or durability, making it an ideal choice for any hot rodder or drag racer looking to up their game. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. This is because the cylinder heads come with 64cc combustion chambers. The Dorman 615-901 has proven itself to be very close in power to the TBSS intake manifold. We think it might, but only at extreme levels that might tax the flow limit of the 706 heads. 243 Heads: All About 243 LS Heads & Their Application, Unleashing the Power of LS2 Heads: Everything You Need to Know, HIGH-PERFORMANCE GM LS-SERIES CYLINDER HEAD GUIDE, Over 2,000 Available, all Makes and Models, Highest Quality with Triple Angle Valve Work. The LC9 engines also came with 799/243 heads. The intake port forms the final part of the air induction system in an engine. The L20 4.8-liter engine had an A on the VIN. They are the best of the factory manifolds with a 4-bolt 87mm throttle body, bigger standard EV6 style injectors, and will pick up about 15 horsepower. The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. have an aluminum build that can withstand high temperatures. Can anyone supply overall dimensions for the Ford 5.3L (all aluminum)and the Ford 2.3L Ecoboost (turbocharged)? They can be cut to 2.000-inch to fit the standard valve seats and extend the rpm range up to 7,000 rpm. However, unlike the 243 heads, they do not require cleaning. kind regards. Gen III/Gen IV LS Engine: Specs, dimensions, and Engine History - Holley Would I need to change push rods and pistons or lifters? The aftermarket is strong, crate engines are available, and used motors are often cheaply sourced through junkyards. Cylinder head casting number for 5.3? | GMTNation It connects the intake manifold with the cylinder heads. The quick way to spot a Gen III block is by looking for the knock sensors and lack of displacement on demand (DOD) bungs in the lifter valley. In fact, this test will illustrate exactly why you can't translate flow figures into power production. Why Chevy 706 Heads LS Make a Great Choice? With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. Is this an error on your statement of facts about the specific vehicles it was in or do I have something special? 5.3L Chevy LS Engine Spotters Guide and Budget Build - MotorTrend Typically, the D-shaped port helps increase the flow of exhaust gases. By Albert, What Does It Mean When It Says Check Awd System. However, before porting, you should make yourself aware of the specifications. 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. This is revealed in the 799 head specs outlined above. This offers drivers an extra boost of performance without having to make any major modifications or upgrades to the engine itself, meaning you can experience improved acceleration and better fuel economy right away! Both heads had 2691 Show more Show more It's. The 799 heads have a smaller combustion chamber of 64cc, which significantly increases the compression ratio. Of course, the 799 heads are good. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. However, it was outshone by higher duration cams like the LS1 which provided greater gains in horsepower and torque beyond 4,400rpm - making them better suited for high revving applications. It is the Lt model and the 8th character of the VIN is 7. Another bonus of the L33 is it had beefier connecting rods than earlier Gen. 3 engines and had full floating pins. Until we find that out, all hail the mighty 706 heads. The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. For a primer on the entire LS engine universe, readLS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family.]. The stock rockers are good up to 175 lbs. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. The 799 LS heads have a 1.55-inch exhaust valve size. 799 Heads - Everything You Should Know - Rx Mechanic 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. Here are some articles that might interest you: Symptoms of Bad Slave Cylinder and Replacement Cost. Note that a reliable channel will eventually guarantee a perfect compression. The 6.2 liter, 376 cubic inch engine churned out an impressive 638 horsepower, making it an ideal choice for those who demanded serious power and performance under the hood. I have the same year and the 8th character is a 7 also. 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? Additionally, this OEM part features hardened valve seats for extended life as well as precision machining that ensures precise fitment to your existing motor and components. There is a medium sized stage 2 cam called the SUM-8701 that has a nice lope. Bought a perfect running truck for 2800$. CHP. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. Have a 2000 Z28 intake on it. Drop a LIKE if you LIKE! The exhaust flow offered by the 241 heads topped the other three heads tested here, but we suspect there would be variations among the different castings with different valve jobs and mileage. ), Why Do People Cover License Plates? 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. The best way to identify a 5.3L is the dish in the piston; the 4.8 has a flattop. The cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. The799 headshave an aluminum build that can withstand high temperatures. They have stronger wristpins, thicker ring lands, and the added valve reliefs allow you to run big cams. Learn how your comment data is processed. Your email address will not be published. You can achieve it with good drivability and power across the entire rpm range by upgrading the cylinder heads. Alternator Overcharging - Causes and Fixes. 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. In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. If youre contemplating 799 heads vs. 706, they offer more advantages compared to 706 heads, irrespective of the common challenge with 799 heads. In the past, others have played with flow numbers and even measured port volumes, but we don't race flow numbers or volumes, now do we? If you're uncertain, here are a few factors to consider before going for 799 heads. That can change if the heads are milled too. Aluminum is a good material of choice because it is lightweight yet durable. 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. This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance.