The factory main caps arent doweled. The massive chamber volume of 71.5 cc's put them a full 10 cc's over the 706 heads. While the 243 heads were initially made for C5 Corvettes from 2001 to 2006, their popularity among LS6 engine users soon expanded beyond this. It is the Lt model and the 8th character of the VIN is 7. As you have most likely caught on by now, these two cylinder heads are practically the same. 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. The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. When it comes to modifying the L33, its easiest to think of it as a small bore LS6. 799 heads (65cc chamber and 210cc intake runner) are pretty much 241 LS6 heads worked over for truck. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. This Cylinder Head has a core charge of $200.00 included in the cost. The LS engines designed with 799 heads were 5.3L and 4.8L truck engines. 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. I have a 2012 silverado 1500 crew cab. Modifications usually start with acold air intake and aftermarket exhaust. We are talking about the 5.3L here, so let's look at the heads they came with. If it's not done correctly, it can decrease performance. For example, if you only drive on the weekends, you can probably get away with a less powerful engine. They can be cut to 2.000-inch to fit the standard valve seats and extend the rpm range up to 7,000 rpm. While the 799 heads offered the most flow, it was not necessarily an advantage on our test engine. You'll also want to consider how often you drive and what kind of conditions you'll be driving. It also accommodates a 90mm throttle body, but doesnt clear the truck accessory drive without modification. ), Why Do People Cover License Plates? Hi Rick. 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 sheer force provided by this motor makes it an ideal choice for anyone looking to take their car or truck to the next level in terms of performance. S. It also boasts a high thermal conductivity rate which helps keep temperatures low during operation. If you're uncertain, here are a few factors to consider before going for 799 heads. 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. 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. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. However you seem to state that it was available until the 2011 model. This helps to reduce the compression ratio, resulting in improved combustion efficiency and increased power output. 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. Year Range: 97-04. While it may not seem like much, the stock 5.3L engine is quite a powerhouse. [] Download Image More @ http://www.onallcylinders.com []. Started jumping up and down. I got the diameter but Im needing the length. 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. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. Are 862 Heads a Better Choice? - Allied Motor Parts The cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. JOIN THE SWEAT PANTS POSSE TODAY! 799 heads - LS1 Additionally, we offer a wide variety of 799 heads to choose from, so you're sure to find the perfect match for your machine. So check out our selection of 799 heads today and get the power and performance you need. have a cathedral-shaped intake port. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. The 243-cylinder head features both an intake port shape and an exhaust port shape designed for maximum efficiency. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. If youre looking for the last bit of power, the long runner FAST LSXR-T is recommended and accommodates larger102mm throttle bodies. How Much Does It Cost to Install Led Lights Inside Your Car? This powerful engine (part No. 243 vs 799 Cylinder Heads: What's the Difference? Would love to see somewhere between 350 and 400 hp at the rear wheels, sounds like its very doable. 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. 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. You will want to install a trunnion kit for added reliability. The main difference between the two is from which mold casting the two cylinder heads originally came. Ever reference I have come across thus far designates that engine as being the LC9. The upgrades included a 58x crank trigger wheel with the cam sensor moved to the timing chain cover. 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. 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). Hunter, the BTR Stage 3 truck cam is nice. Putting a truck cam in puts you in the zone by itself. They come with all new stainless steel swirl polished 2.00 and 1.57 valves, new springs for up to .650 lift, new retainers, spring seats, and valve seals. It is clear that the LS6 was a pinnacle in Head Design by GM. 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. 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 head is designed for use with four cylinders but can be adapted for use with up to 6 cylinders if necessary. If you are looking for a daily driver cam, the Summit Racing Pro LS SUM-8712 stage 1 is a great onelots of power and a slightly noticeable lope and uses stock springs. 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. 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 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. 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 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. Wont really be a daily driver but a toy I can get out and turn heads with. . 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 . kind regards. And for $90 why not. The block is 80 pounds lighter than the iron version. A lot has been unveiled about 799 heads. Meanwhile, a reduced compression ratio results in a cooler burning temperature. 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. The Dorman 615-901 has proven itself to be very close in power to the TBSS intake manifold. If you are changing the pistons, look for the Gen IV heads to get the airflow and the compression bump at the same time. The L20 4.8-liter engine had an A on the VIN. History of the LS Engine and Cylinder Head Casting Number - MotorTrend 799 is a 5.3 liter head. The decks are thicker to withstand more boost. It is responsible for removing the spent gases from the cylinders. The main reason for going with a stroker forged crank is for the added cubic inches. I would like to keep it as budget friendly as possible, and make around 500-600 whp. Drop a LIKE if you LIKE! Learn how your comment data is processed. 799 heads chamber size | Yellow Bullet Forums The L20 4.8-liter engine had an A on the VIN. You need the main info about your engine components to get the right numbers. Second was to procure a test mule. 799 Heads - Everything You Should Know - Rx Mechanic Hi, im going to put a L33 in my 1973 C10 shortbed. In 1999-2000, LQ4s came with #373 or #873 heads that had 71cc . You can achieve it with good drivability and power across the entire rpm range by upgrading the cylinder heads. Generally,supercharger cams and nitrous cams will have slightly more lobe separation and longer exhaust duration. 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. The L33 is basically a baby LS6 with a truck intake. Not knowing it is a vin(b) 5.3 l33ho. If so, what would you recommend? 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. Stumbled across a 2005 ext cab Silverado. 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. Thanks. My son and I are looking for the L33 now for a swap into his 1992 F150 extra cab short bed. The 799 LS heads have a 1.55-inch exhaust valve size. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. 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. We loooove V8 Sky/Solstice swaps. Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. Both the 4.8L and 5.3L have the same bore yet different strokes. I just bought a low mileage L33 with only 53k on the clock. Inside are ARP mains and head studs, and an M365 Melling oil pump. This helps to guarantee whether the channel of the cylinder head is reliable. We had high hopes for the 317 heads, but they were definitely the low man on the performance totem pole. The implications differ for both scenarios. The shape is designed to increase airflow and power. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. However, if you're planning to drive in hot weather or at high altitudes, you'll need an engine that can handle harsh conditions. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. Of course, the 799 heads are designed with a cathedral shape intake port. The motor was equipped with a healthy Comp cam and run with the Dorman LS2 intake on the 799 heads and stock LS3 intake on the LY6 heads. The peak flow numbers differed by just 7 cfm at 0.700 lift. The Evolution of the Vortec Truck Engine - Lowbuck LS Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM made. This will definitely free up a few horsepower and gives the little engine a big personality. There are a few other parts needed for a L33 cam swap such as an LS2 timing chain, LS7 spec lifters, LS2 timing chain damper and thick-wall chromoly pushrods. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. The sophisticated architecture with a cathedral-shaped port allowed 799 heads to offer amazing performance on truck engines. If you need any help finding the right set of heads for your engine, contact us, and we'll be happy to assist you. 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. I forgot to add I will not be using boost and what would be the best fuel rails and injectors? The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. Should Copper Spray Be Used on a Head Gasket? I plan on having the mill the block and heads, but would like to do the rest of the build myself. It marked a significant milestone in GM's LS series engines as it showed that adding a supercharger could result in incredible power gains while still retaining its reliable nature and longevity. These are best for high-compression builds and really need larger valves and porting work. We have been told by a reputable source that the chamber design of the 317 heads is less than optimal as well, irrespective of the size, meaning if you milled it, it still would not produce the power you could get from the 799s, let alone the 706s. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. 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. Its priced at $299.99, making it one of the most affordable high-performance cylinder heads available today. 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. The aluminum blocks have Siamese bores with sleeves that are bonded to the block, and other enhancements, making them durable for boosted power. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. 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. The 241 heads were used on 5.7L LS1 applications and are considered by many to be just a minor step up in performance from the 706. At best, flow numbers indicate potential power, but we are getting ahead of ourselves. They come with smaller chambers compared to some of their counterparts with rectangular ports. And given your intake setup, you may need to trim or modify these too fit. However, before porting, you should make yourself aware of the specifications. You also need to consider the type of vehicle you have. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. The 799 LS heads have a D-shaped port. Sometimes referred to as the LS6, the LQ4 is a 6.0 litre member of General Motors' Vortec engine family. 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. i have every length exc for valves but i would just call the dealer and they can give u the lenght and pt#s if u need anytging else for stock 5.3 info i have it. The DOD, later called active fuel management (AFM) bungs, will be obvious on the Gen IV engines. 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. The power output of these compact racers was increased to 430 horsepower and beyond, making them more than capable of competing against rival vehicles on tracks around the world.