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? There is a medium sized stage 2 cam called the SUM-8701 that has a nice lope. This means that it has plenty of power to tackle any job you can throw at it, whether youre commuting on the highway or taking your truck off-roading for some fun in the mud. 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. An electric fan kit will free up that power. Its been known to handle over 1,000 whp. The VVT system needs to be eliminated for aftermarket cams. I have the LC9 5.3 in my 09 GMC, does anyone know the length of the intake and exhaust valves? Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. It was actually the 8th digit of the vehicle identification number. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. I have a 5.3 in my Pontiac Solstice. . The configuration allows for a higher compression ratio, resulting in more horsepower. Hello, Im wanting to delete the DOD in my 2011 Sierra 44 with a .525 or so cam, I am wanting to know the best parts I should use for lifters, push rods, maybe 1.8 rockers, springs, bushings, locks & or injectors. Main studs should be added any time youre this deep in the engine. The 799 heads have been amazing on the 4.8 and 5.3-liter truck engines since inception. If you are going through the heads, its recommended to switch to the light hollow-stem intake valves from an LS3. 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 can positively impact a vehicles engine performance and efficiency. The main reason for going with a stroker forged crank is for the added cubic inches. 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. The aluminum blocks have Siamese bores with sleeves that are bonded to the block, and other enhancements, making them durable for boosted power. 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. They have far outflowing capabilities compared to their cathedral-style counterparts, making them one of the top LS cylinder head options available today. First, you want to avoid the Gen III heads with the "battery" castingthey are crack prone. 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. 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. As a result, they have become some of the best performing cathedral port factory heads available on the market today. I have a 2012 silverado 1500 crew cab. Both the 4.8L and 5.3L have the same bore yet different strokes. 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. The L20 4.8-liter engine had an A on the VIN. Now, combine that with the fact that the 706 headsthe same set everyone throws awaymade the most power, and we might have just turned the LS world upside down. I PUT A STAGE 1 TSP TRUCK CAM WITH AIR RAID INTAKE AND DYNOED 283WHP AND 302WTQ. 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. Second was to procure a test mule. 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. It also has a 7 for eigth number of Vin in my 2012 Silverado. The 799 heads have a smaller combustion chamber of 64cc, which significantly increases the compression ratio. The L33 intake wasnt particularly good and had a 3-bolt 78mm DBW throttle body. For example, if you only drive on the weekends, you can probably get away with a less powerful engine. The larger chambers make the 317s popular for boosted applications, but know you are starting with a significant deficit by replacing the 706 heads with the 317s. The stock heads should be something like 61.15 cc The 799 heads should be 64.45 1994 SFBD extcab longbed 20/22 406sbc Project thread http://www.s10forum.com/forum/f30/project-ext-longbed-289758/ Beyond that, .575 to .600 in. You can check out 799 heads on eBay. I would like to keep it as budget friendly as possible, and make around 500-600 whp. 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. Advanced Search Cancel . Flat Top (2007-09), Flat Top with valve reliefs (2010-11). RPO code in glovebox listing LC9 confirms it. 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! here are some fuel rail covers for the LS engine, but we couldnt find ones that specd the 5.3L precisely. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. Should Copper Spray Be Used on a Head Gasket? These 799 heads are the latest model and are made using the semi-permanent mold method. You will need re-route the EVAP line and may have to extend the MAP sensor harness. 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. It is an aluminum block 5.3 with either 706 or 862 heads, NON DOD. This is because the cylinder heads come with 64cc combustion chambers. 799 Ls Heads Came On What Motor | caredcar.com That can change if the heads are milled too. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. 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. The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. If youre looking for something close to 350-400 hp at the wheels, youre in the right place. The aluminum 5.3-liter truck engine has 799 heads. In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). The engine specs and information listed here is for a stock LC9 engine. Im also thinking of 102mm intake manifold. Modifications usually start with acold air intake and aftermarket exhaust. 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. I am also looking fo a tbss or 07 NNSB intake. The cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. Learn how your comment data is processed. in this thread in this sub-forum in the entire site. The amazing success of this design is evident in the fact that its casting number, 243, was recycled for use on the LS2. 5.3L Chevy LS Engine Spotters Guide and Budget Build - MotorTrend Note that a reliable channel will eventually guarantee a perfect compression. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. 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. Have a 2000 Z28 intake on it. Alternator Overcharging - Causes and Fixes. Though they offer plenty of flow, they also started with a huge drop in compression (from 9.5:1 to 8.3:1), and therefore power. Your email address will not be published. 2007 Chevy trailblazer SS. Can anyone supply overall dimensions for the Ford 5.3L (all aluminum)and the Ford 2.3L Ecoboost (turbocharged)? Still looking for more? Lq9 With 243 Heads Compression Ratio | caredcar.com 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. If youre contemplating 799 heads vs. 706, they offer more advantages compared to 706 heads, irrespective of the common challenge with 799 heads. Thanksfinally getting around to this but switched gearslooking at an L33 with stock mild cam with LS6 heads and intake-stand alone harness for my 67 impala.trying to figure out if this is a good fit for the 67 with 4l60e trans? The 243 and 799 cylinder heads are practically the same, with only minor differences in port and valve sizes. You'll also want to consider how often you drive and what kind of conditions you'll be driving. 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. 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. The 243-cylinder head has an intake port volume of 210 cc and an exhaust port volume of 75 cc. The L20 4.8-liter engine had an A on the VIN. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. Ive got the engine tore down and ready to go to the machine shop. The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. Aki Ito. 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. 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. I have a 2013 Chevy Silverado 1500. 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. 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. 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. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. This powerful engine (part No. Generally,supercharger cams and nitrous cams will have slightly more lobe separation and longer exhaust duration. Truck engine bays make fitting turbos easy. They can be found for around $1,300 which is inexpensive for an aluminum block engine. 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 799 Cylinder Head is made from lightweight aluminum that helps reduce weight while still providing superior strength. As such, they are a great choice for those looking to get more out of their engine with minimal effort. 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. The intake port volume for 799 LS heads is 209 cc. The Gen IV came from the factory with drive-by-wire on the throttle body, a 58x reluctor wheel, and in some cases, variable valve timing (VVT), AFM, or both. The material of the cylinder heads is another essential feature. Meanwhile, a reduced compression ratio results in a cooler burning temperature. Are any fuel rail covers available for this engine. But . Plug-in programmersare easy to use but have limits. 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. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. 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. These heads are said to be basically the same as the 243 head everyone gets a boner for. Scroungers are known to CNC port the 862/706 heads to get them to outflow the more expensive Gen IV 243/799 head. These mods can be done in your garage, but the tune wont be optimized. How Much Does It Cost to Install Led Lights Inside Your Car? Keep in mind, the original throttle body had an 8-pin connector. These are usually reserved for larger engines because they can handle the increased displacement and power. The Gen III has the 24x reluctor on the crankshaft and can be run with a cable-driven throttle body and factory computer. I am swinging back and forth with LQ9, L33 or L92. You also need to consider the type of vehicle you have. 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? It also accommodates a 90mm throttle body, but doesnt clear the truck accessory drive without modification. Vin.Seventh digit is 7. Not only was the LS9 the most powerful LS to date, it was also the first variant of General Motor's powerhouse engine to be equipped with a supercharger. 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. You'll want to consider it if you're looking for increased performance. The factory main caps arent doweled. If you're uncertain, here are a few factors to consider before going for 799 heads. I have 07.5 4.8 no vvt or dod hydro locked it , bought an 2012 suburban with 5.3 lc9 im going to do dod/vvt delete n cam kit hows the fuel iknow lc9 uses e85 n pump how can i keep that feature on my 07.5? It still has the same 24X reluctor ring, cam sensor location, knock sensor location etc. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. The flat-top L33 pistons added some much needed compression. Stay away from the LS4 from front-wheel-drive cars. This was coupled with a 3.876-inch chamber diameter. This put it within 2.5 cc's of the 706, meaning there was only a minor change in static compression between the two. As you have most likely caught on by now, these two cylinder heads are practically the same. Besides 799 heads, we also stock LS 243 cylinder heads for customers looking for a high-performance option. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. what recipe should I look into? The shape is designed to increase airflow and power. A broken cylinder head can be Cylinder heads are the essential building blocks of an engine, and they play a vital role in the efficient operation 2020 Allied Motor Parts. But on the upside, both respond equally well to porting. Of course, the 799 heads are designed with a cathedral shape intake port. Which came out in the 2014 model years. Like most auto parts, cylinder heads can eventually crack or fail for various reasons. However, if you're planning to drive in hot weather or at high altitudes, you'll need an engine that can handle harsh conditions. We recommend that you talk to your local chassis dyno tuner and decide on a computer programmer. 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. In many ways its the 327 of this era. Although an iron block 5.3 will handle more power, the L33 can still support over 850 whp. Would this change with the presence of boost? 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. If youre looking for the last bit of power, the long runner FAST LSXR-T is recommended and accommodates larger102mm throttle bodies. The question now is where that limit occurs. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. 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. Pulling 799 Heads off a RARE LS Powered Junkyard Vehicle for CHEAP + Turbo LS Nova Streetcaring SPPTV 40.3K subscribers Subscribe 140K views 3 years ago This time on SPPTV we head to our. Any 799 or 243 head found on a truck had the regular valvetrain. 6.0L LS Head Test-Who Wins-799 vs 823? - YouTube You can achieve it with good drivability and power across the entire rpm range by upgrading the cylinder heads. Go there and search LS engines for a comprehensive collection of LS engine tech information.). 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. Any other recommendations or required mods are welcome. Not really an expert, Your email address will not be published. While large combustion chamber reduces the compression ratio, smaller combustion chamber produces more power due to increased compression ratio. The 5.3L uses a Roll Master billet timing set with a Torrington bearing, and an LS2-style chain damper. Wanting to go with 5.3 since its a bit cheaper and dont care that Ill be loosing performance. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. 243 came with sodiom filled stem 1.55 exhaust valves (lighter and more heat dissepation) and 799 came with regular solid stem 1.55. Dont mind a little downtime? A 205cc runner head is a good match with the TBSS intake. When it comes to modifying the L33, its easiest to think of it as a small bore LS6. have a cathedral-shaped intake port. Simply put, the Gen III is easy to swap and cheap, and the Gen IV has better heads and more complexity. The massive chamber volume of 71.5 cc's put them a full 10 cc's over the 706 heads. However, unlike the 243 heads, they do not require cleaning. SMASH THAT SUBSCRIBE BUTTON! 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. It was known as the Vortec 5300 HO and made more power than the older LM4. But, they are also much heavier than aluminum heads, which can negatively affect performance. The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power. These heads are for a new project that will be beginning soon on the channel, more on that soon! By Albert, What Does It Mean When It Says Check Awd System. Youve likely upgraded the fuel system and injectors if youre looking at power adders. Both the 4.8L and 5.3L have the same bore yet different strokes. 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 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. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. It is an aluminum block. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped directly. Until we find that out, all hail the mighty 706 heads. 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. It connects the intake manifold with the cylinder heads. Like the 317s, the 241 heads out-flowed the 706 heads, but once again, that airflow did not translate into power production. Aftermarket Heads Why Chevy 706 Heads LS Make a Great Choice? - Allied Motor Parts Call us today. However you seem to state that it was available until the 2011 model. The Vortec head design is based off the popular cathedral port design that was used in the late 90s trucks and vans with some minor changes to improve air flow without sacrificing durability or strength. The test engine was an easy choice, as the 5.3L was the go-to engine, especially for the power-adder crowd. 799 heads - LS1 If youre gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. The smaller combustion chambers help to reduce the compression ratio, which in turn boosts combustion efficiency for increased power output. 243 vs 799 Cylinder Heads: What's the Difference? Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Thanks. Usually found in GM trucks, the LS engines with 799 heads come in two sizes: 5.3L and 4.8L. Depending on how much power you intend to make, upgrading to largerfuel injectorsmay be needed. I have a 2006 L33 and a 6 speed manual trans going into a 63 impala. L33 5.3L Engine Upgrade Guide: Expert Advice for L33 - OnAllCylinders (Is It Bad to Remove Them? While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. The combination of the two will pull strongly up to 7,000 rpm. 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 . They have stronger wristpins, thicker ring lands, and the added valve reliefs allow you to run big cams. If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. 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. I plan on having the mill the block and heads, but would like to do the rest of the build myself. 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. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. The cylinder head of a vehicle is a great component playing a significant role in the superior performance of the engine. 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. 799 Heads - Everything You Should Know - Rx Mechanic You can make 700+ hp with a couple of simple upgrades like head studs and LS9 head gaskets. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. This will definitely free up a few horsepower and gives the little engine a big personality. However, before porting, you should make yourself aware of the specifications. These 799 heads are the latest model and are made using the semi-permanent mold method. CNC Ported 862 LS Heads- The Ultimate New Gen Cylinder Heads The CNC Ported 862 LS Heads are the most demanding cylinder heads in the modern era. These engines used a 24x crankshaft trigger wheel and a cam sensor mounted at the rear of the camshaft. 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. The 799 LS heads have a 1.55-inch exhaust valve size. 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. For example, Corvette Z06 models feature 243 heads with sodium exhaust valves, which is typical for an L6 engine. after bottom dead center and alter the intake valve opening to set the idle quality. Description: CNC Ported LS1/LS6 243/799 Cyl Heads .650 Springs 2.02/1.59 Valves PAIR. My rear is set with 3.42 gears and a locker. Compression Ratio & Combustion Chamber Size | GMC Truck Forum After reading these recommendations, I cant stop grinning. The L33 is basically a baby LS6 with a truck intake. Or replace old parts? The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. Your email address will not be published. The head gasket bore diameter isnt optimal, but with careful tuning and race fuel it can withstand 850+ whp.