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 243-cylinder head features both an intake port shape and an exhaust port shape designed for maximum efficiency. 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 power output can swing up to around 3 4 percent, delivering about 25 horsepower (hp). i have a 3 which is a alum block lc9 with 799 heads, You think it is possible you could send a picture of motor and transmission my vin number 8th character is a number 3 as well, I have a Chevy Silverado 2011 z71 44 1500 extended cab Lt vin 8th character number 3 its supposed to be a Lc9 with the 799 heads for motor and the 6 speed transmission I believe someone has swapped out my motor and transmission with something else on the front of the motor its got vo4 right behind the water pump what does this mean if could get We also took the liberty of measuring the combustion chamber diameter (distance across) to illustrate how the factory sized them for their particular target bore size. Your email address will not be published. The massive chamber volume of 71.5 cc's put them a full 10 cc's over the 706 heads. If youre gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. Turbo cams reduce overlap with less exhaust duration split in relation to the intake. Bore 2/4 = 2.326 in. Furthermore, this cylinder head has an intake port volume of 209 cc and an exhaust port volume of 74 cc. The 243-cylinder head was mostly used on the LS6 and the LS2 engines. The 799 head cc is pretty smaller compared to some others. You can make 700+ hp with a couple of simple upgrades like head studs and LS9 head gaskets. 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. when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). This helps to reduce the compression ratio, resulting in improved combustion efficiency and increased power output. The 241 heads performed slightly better than the 317s, and the 799s were better still. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. A larger port volume results in more power, decreasing fuel economy. I am looking at 5.3 with 862 heads to put in a 1950 fleetline. How Much Does It Cost to Install Led Lights Inside Your Car? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 799/243 Heads - Cylinder Head - Remanufactured CNC Ported LS1/LS6 Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. Therefore, regardless of which head you choose, you will still receive maximum power from your engine. 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. Car Wobbles at a Very Low Speed (Causes and Fixes). 799 heads are some of the most recent cylinder heads on the automotive parts market. The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. 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. im looking into getting 600whp will the stock heads get me this with a 80mm turbo? While it may not seem like much, the stock 5.3L engine is quite a powerhouse. In addition to these applications, this port design can be found on Cadillac CTS-V models and the LS9 in the Corvette ZR1, giving further evidence of its exceptional quality and power output potential. 799 cylinder heads have a compression ratio of 9.5:1. Will the stock ECU be able to be programmed for the manual? Sometimes referred to as LS3 heads, L92 heads are renowned for their superior performance capabilities. 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. Swapping a L33 into a 96 Silverado with a fresh NV3500. 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. in this thread in this sub-forum in the entire site. This combination allows for ample airflow and optimal burning of fuel, resulting in an increase in performance output compared to many other stock cylinder head designs available on the market today. Inasmuch as porting to 799 heads comes with an advantage of increased horsepower due to increased compression, you must ensure to consider both the pros and cons before swapping the cylinder heads. I got the diameter but Im needing the length. We are talking about the 5.3L here, so let's look at the heads they came with. Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. 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. They also had larger 2.00 intake valves than the Gen III. 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. Why Chevy 706 Heads LS Make a Great Choice? - Allied Motor Parts 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. 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. 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! Im in the planning stages of swapping an L33 into an 87 porsche 944 turbo. Sometimes referred to as the LS6, the LQ4 is a 6.0 litre member of General Motors' Vortec engine family. 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 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. Thanks. Another factor to consider is whether or not the heads have been ported and polished. It is vital to note that combustion chamber size plays a significant role in either increasing or reducing the compression ratio. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. 9 Minutes Read / Of course, the 799 heads are designed with a cathedral shape intake port. It produces an impressive 320 horsepower and 340 lb-ft of torque from its factory settings. 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. 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. However, if you're planning to drive in hot weather or at high altitudes, you'll need an engine that can handle harsh conditions. Im also thinking of 102mm intake manifold. (Solved). wall tool-steel pins is a good idea. These cylinder heads were originally designed for various models of Chevy vehicles and are compatible with LM7, LR4, and LM4 5.3 engines. Any other recommendations or required mods are welcome. Required fields are marked *. My son and I are looking for the L33 now for a swap into his 1992 F150 extra cab short bed. You may need a bit longer of a pushrod as well. Meanwhile, some vehicle enthusiasts and professional auto mechanics opine that swapping to 799 heads is worth it. The other cams Ill point out next use LS6 springs and youll want to do a tune. Second was to procure a test mule. 4X4 . I like the sum-8712 cam idea, but my issue might be keeping it under the hood. The valves are responsible for letting air and fuel into the cylinder and the exhaust from that combustion out of the cylinders. what recipe should I look into? Not surprisingly, the 799 heads flowed the most, with an impressive peak flow of 250.2 cfm when tested at 0.700-inch lift - that's over 13 cfm higher than their nearest competitor! 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. The combustion chamber is the space in the cylinder where the air/fuel mixture is ignited. Which Motor would be a good replacement drop in with parts being used from old engine? The 243/799 heads have cathedral ports with improvements destined for the LS6 Corvette and later the LS2. The chamber volume on the 799 heads was within 2.5 cc's of the 706 heads, but the. Surprising HP Numbers From Our Stock LS Cylinder Head Test - MotorTrend 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! Single turbo systems using. 799 heads users can verify the valve seating of the cylinder heads by engaging vacuum and pressure testing. The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. Thanks. The DOD, later called active fuel management (AFM) bungs, will be obvious on the Gen IV engines. This is the test everyone wanted to see, and the one every LS owner will be talking about. The 5.3L uses a Roll Master billet timing set with a Torrington bearing, and an LS2-style chain damper. Would love to see somewhere between 350 and 400 hp at the rear wheels, sounds like its very doable. Share with your Friends!Facebook @ SPPTV YouTubeInstagram @ SPPTVonYouTubeSnapchat @ SPPTVPO BOX:Rob ExnerPO BOX 99900 LX 087 592RPO GARDEN CITYWINNIPEG MB R2V 5A2CANADA All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. 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 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. The smaller intake valve is the reason many LS owners dismiss the 706 heads, but enthusiasts should really look at something called the Coefficient of Discharge. With some modification, I am mating it up with a 4l60e. The 243 and the 799 cylinder heads are practically the same. In addition, better materials can be used during this process such as stainless steel valves or bronze guides in order to reduce wear over time while still providing maximum performance benefits. 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. 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. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. 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. Aftermarket Heads These mods can be done in your garage, but the tune wont be optimized. What heads came on LQ4? Scroungers are known to CNC port the 862/706 heads to get them to outflow the more expensive Gen IV 243/799 head. We think it might, but only at extreme levels that might tax the flow limit of the 706 heads. With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. This specific guide is for the GM LC9 5.3L engine. Bore 1/5 = 2.346 in. if u wanting to save money i know u can upgrade the stock rocker fulcrums sum sells a kit.otherwise i would just contact a rep from sum to help you find the best part for you. The 5.3L engine is reliable and incredibly versatile, making it a great choice for anyone looking for a powerful yet economical engine option in their vehicle. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Keep in mind, if youre running a cam in the 230 range, piston to valve clearance needs to be checked and fly-cutting may be required. The factory 5.3L designations are LH, LY, LM, LC, or L8 instead of LS (the exception is the FWD LS4). With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. And given your intake setup, you may need to trim or modify these too fit. 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. But, they are also much heavier than aluminum heads, which can negatively affect performance. Aluminum is a good material of choice because it is lightweight yet durable. Youve likely upgraded the fuel system and injectors if youre looking at power adders. 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 . The 243-cylinder head often causes sediment buildup in the fuel tank, which later on clogs the fuel filter and causes engine problems. 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. LS engine spec guides and LS-relatedinformationhere. The question now is where that limit occurs. The decks are thicker to withstand more boost. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. The LT series engines are beyond the scope of a cheap 5.3L for now. The 243-cylinder head is compatible with OHV (overhead valve) engines as well as 16-valve engines (2 per valve). 243 came with sodiom filled stem 1.55 exhaust valves (lighter and more heat dissepation) and 799 came with regular solid stem 1.55. The smaller combustion chambers help to reduce the compression ratio, which in turn boosts combustion efficiency for increased power output. someone to get original picture of motor and transmission with this trim and year of truck its much appreciated. These heads are said to be basically the same as the 243 head everyone gets a boner for. It was actually the 8th digit of the vehicle identification number. 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. You'll also want to consider how often you drive and what kind of conditions you'll be driving. Designed specifically for a 6.0L application, the 317 heads also had the largest chamber diameter of 3.923 inches. The 209cc intake ports flowed as expected, but the 74cc exhaust ports were not quite up to snuff. 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. On the Gen IV, knock sensors are on the side of the block instead of in the lifter valley, and the cam sensor is moved to the front of the timing chain cover. In addition, the 799 heads deliver increased power output on the 5.3-liter truck engine. All rights reserved. While the 243 heads were initially made for C5 Corvettes from 2001 to 2006, their popularity among LS6 engine users soon expanded beyond this.
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