The 799 cylinder head was mostly used on the L33, which is the aluminum block version of the LM7. If youre looking for the last bit of power, the long runner FAST LSXR-T is recommended and accommodates larger102mm throttle bodies. (Blurring Pictures Online), How to Gap Spark Plugs With and Without a Tool, Why Engine Is Hot and AC Turned Off (Causes and Fixes). Would love to see somewhere between 350 and 400 hp at the rear wheels, sounds like its very doable. The 209cc intake ports flowed as expected, but the 74cc exhaust ports were not quite up to snuff. The size of the valves affects the performance of an 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. These are usually reserved for larger engines because they can handle the increased displacement and power. You can check out 799 heads on eBay. For example, should you opt for theChevy 799 heads, or are the LS 243 cylinder heads better? Here are some articles that might interest you: Symptoms of Bad Slave Cylinder and Replacement Cost. What did LS 862 heads come on? Would I need to change push rods and pistons or lifters? For many people, selecting suitable cylinder heads can be pretty tricky. . You will want to install a trunnion kit for added reliability. It is no surprise that the 317 heads made the least power. However you seem to state that it was available until the 2011 model. To maximize torque in the mid-range in a truck cam, manufactures close the intake valve at about 35-40 degrees (@.050 in.) Any 799 or 243 head found on a truck had the regular valvetrain. Vin.Seventh digit is 7. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). I am looking at 5.3 with 862 heads to put in a 1950 fleetline. The L33 intake wasnt particularly good and had a 3-bolt 78mm DBW throttle body. The question now is where that limit occurs. Dyno testing revealed that at certain lift points, the 799 heads were able to outflow their predecessors by as much as 20 cfm. An LS3 or LS9 cam makes good power, but not where you want it if youre using the L33 engine in a truck. 9 Minutes Read / Modifications usually start with acold air intake and aftermarket exhaust. 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. Like the 317s, the 241 heads out-flowed the 706 heads, but once again, that airflow did not translate into power production. The799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. RPO code in glovebox listing LC9 confirms it. If you have a Gen IV short block (no heads), you can find an equally cheap set of 862 heads and do a valve job and port job to get both compression and airflow. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. If youre going over 800 hp, a set of .200 in. The factory 5.3L designations are LH, LY, LM, LC, or L8 instead of LS (the exception is the FWD LS4). Thanks. Anyway I can get it to be solid strong. 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? These cylinder heads feature a rectangular port design, which is also found on 6.0L truck engines and the Pontiac G8 6.0L engine. of seat pressure and 450 lbs. I like the sum-8712 cam idea, but my issue might be keeping it under the hood. 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. 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. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. The first order of business was to identify and round up a selection of popular LS factory heads. In terms of cylinder heads, we included the 706 small-valve 5.3L heads, the 241 (LS1), 317 (6.0L truck), and 799 (as a stand-in for the hallowed 243) heads. 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. The factory cam is tiny and really holds the engine back. 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. The Mini-Delphi/Multec II connector 25-pound injectors are a limitation at around 380 whp. 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. To run the newer style 6-pin throttle body requires a Torque Rush X-Link harness adapter. This reduces expense when you build it up. Which one do you think would be better and what unexpected changes are needed for both. The aftermarket is strong,crate enginesare available, and used motors are often cheaply sourced through junkyards. Both heads had 2691 Show more Show more It's. 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. 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. The idea was to flow and measure each head, then follow up with the all-important dyno testing. The 243-cylinder head was mostly used on the LS6 and the LS2 engines. 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 head flow supersedes that of 706 heads with as much as about 20 cfm at specific lift points. This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance. We are talking about the 5.3L here, so let's look at the heads they came with. 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). looking for reliability with a little get up. Your email address will not be published. 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. The additional horsepower provided will allow drivers to experience an improvement in acceleration and top speeds while also having more confidence when tackling tough terrain or hauling heavy loads. It also accommodates a 90mm throttle body, but doesnt clear the truck accessory drive without modification. They have far outflowing capabilities compared to their cathedral-style counterparts, making them one of the top LS cylinder head options available today. The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. That will determin what pushrod to go with. The cylinder head gasket is one of the most over-engineered and stressed components in an internal combustion engine. The intake port forms the final part of the air induction system in an engine. 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. It is an aluminum block. Why Is My Car Accelerating on Its Own? These heads are said to be basically the same as the 243 head everyone gets a boner for. 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. making 310hp (235kW). If you are going through the heads, its recommended to switch to the light hollow-stem intake valves from an LS3. Aug 27, 2022 / SMASH THAT SUBSCRIBE BUTTON! Lets talk about bottom-end upgrades. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. The 243-cylinder head is made from lightweight aluminum, which helps reduce overall weight without sacrificing power or performance. 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 cylinder heads perform amazingly on the truck engines. Which Motor would be a good replacement drop in with parts being used from old engine? Therefore, the size of the exhaust valve is an essential factor in determining how much power an engine can generate. 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. 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. If so, what would you recommend? Call us today. Converter recommended. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. 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. So I guess its LC9 5.3 . This can positively impact a vehicles engine performance and efficiency. However, you may also find some heads made from cast iron. have an aluminum build that can withstand high temperatures. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. Ultimately, its up to you to decide which cylinder head best suits your needs. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in. If you are changing the pistons, look for the Gen IV heads to get the airflow and the compression bump at the same time. Flat Top (2007-09), Flat Top with valve reliefs (2010-11). Next to the 706 heads, the 799s featured the smallest combustion chamber at 64 cc. what recipe should I look into? It is clear that the LS6 was a pinnacle in Head Design by GM. Drop-in .500-in. any input would be appreciated. His remarkable performance was met with thunderous applause from spectators all around, and this moment will certainly go down in history as one of the most impressive accomplishments achieved by any driver to date. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. LS engine spec guides and LS-relatedinformationhere. The port volumes were within a couple of cc's of the 241 LS1 heads, and the peak flow differed by around 5 cfm despite the 706 heads having a smaller intake valve size. 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 increased chamber volume of 6.5 cc's dropped the compression ratio by nearly 0.80 points. Here are the differences: 243 heads came with 2.00 hollow stem intake valves (lighter) and 799 heads came with regular solid 2.00 intake valves. This further improves airflow and power output from your engine without compromising efficiency or torque production levels. What heads came on LQ4? The 5.3L uses a Roll Master billet timing set with a Torrington bearing, and an LS2-style chain damper. The sophisticated architecture with a cathedral-shaped port allowed 799 heads to offer amazing performance on truck engines. The L33 is basically a baby LS6 with a truck intake. An increased compression ratio results in more power output. . 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. lift cams are popular, but LS6 springs allow you to run .550-in. However, when it comes to performance, both are interchangeable and will provide the same power output. With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. These cylinder heads were originally designed for various models of Chevy vehicles and are compatible with LM7, LR4, and LM4 5.3 engines. In production these heads have been repurposed on the aluminum 5.3L truck engine (L33, "799" casting), which proves that despite being originally made for a 3.90-inch bore, these heads even fit on 4.8/5.3L blocks (3.78-inch bore), and are quite abundant used. If you're looking to get the most out of your engine, you'll want to take a closer look at the flow numbers for the different heads. Why Chevy 706 Heads LS Make a Great Choice? The LC9 engines also came with 799/243 heads. When testing the 5.3L heads, the 706 and 799 heads were compared to determine which offered the most flow. Have a 2000 Z28 intake on it. The 243-cylinder head weighs just 26 lbs, which is significantly lighter than most other aluminum heads on the market. Both the 4.8L and 5.3L have the same bore yet different strokes. If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. The 4.8L has a 3.27-inch stroke, and the 5.3L has a 3.62-inch stroke. 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. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. Required fields are marked *. (Solved). The accessory drive will swap over, but theres a chance youll need to drill and tap one of the holes for the alternator bracket. It is the Lt model and the 8th character of the VIN is 7. Trucks often came with mechanical fans that sap horsepower. Aki Ito. The configuration allows for a higher compression ratio, resulting in more horsepower. It is vital to note that combustion chamber size plays a significant role in either increasing or reducing the compression ratio. However, unlike the 243 heads, they do not require cleaning. Many ported 799 heads are made from aluminum, which is a good choice because it's both solid and lightweight.
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