The L33 swap is a pretty common one as LS1s are getting hard to find. The 243-cylinder head is compatible with OHV (overhead valve) engines as well as 16-valve engines (2 per valve). The 243 and the 799 cylinder heads are practically the same. This specific guide is for the GM LC9 5.3L engine. If you are contemplating a porting job, choosing the 799 cylinder heads will be wise. They come with smaller chambers compared to some of their counterparts with rectangular ports. I am searching for all these at the local JY but am torn on what way to go. For example, if you only drive on the weekends, you can probably get away with a less powerful engine. The factory main caps arent doweled. Required fields are marked *. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. 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. 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. 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 its aluminum construction, this assembly boasts maximum heat dissipation while still providing a lightweight design that won't bog down your engine's performance. First, you want to avoid the Gen III heads with the "battery" castingthey are crack prone. You'll want to consider it if you're looking for increased performance. 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. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. Bore 1/5 = 2.346 in. Stay away from the LS4 from front-wheel-drive cars. Like the 317s, the 241 heads out-flowed the 706 heads, but once again, that airflow did not translate into power production. The valve stem of the 799 cylinder heads can be replaced with new ones in order to ensure high-quality performance and efficiency. 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. A higher compression ratio leads to increased power output, which also means increased heat inside the engine. Call us today. If you upgrade and depending on the injectors you run, you may need a fuel injector adapter harness. 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? 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. However you seem to state that it was available until the 2011 model. The head is designed for use with four cylinders but can be adapted for use with up to 6 cylinders if necessary. In 2014, the L83, the LT version of the 5.3L, appeared with direct injection, taking the engine in a totally different direction. Furthermore, even if you do decide to switch out the heads, there would still be no difference in horsepower output. What heads came on LQ4? So I guess its LC9 5.3 . 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? The 243-cylinder head was mostly used on the LS6 and the LS2 engines. The 243-cylinder head was mostly used on the LS6 and the LS2 engines. Osuagwu Solomon is a certified mechanic with over a decade of experience in the mechanic garage, and he has over five years of experience in the writing industry. 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? Should Copper Spray Be Used on a Head Gasket? 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? The 799 is basically the successor to the 243 without any significant changes. Aluminum is a good material of choice because it is lightweight yet durable. The port shape is identical to the 243-cylinder head. making 310hp (235kW). For performance-minded automotive enthusiasts, the GM LS3 L92 6.0L 6.2L Cylinder Head Assembly 821 Square Port Genuine OEM is the ultimate upgrade in power and strength. So lets look at the 799 heads and what makes them a nice choice for a porting job. You also need to consider the type of vehicle you have. 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. While a smaller combustion chamber increases the compression ratio, the bigger one reduces the compression ratio. This also helps reduce emissions by allowing more complete fuel combustion in each cylinder. 2007 5.3 with 862 heads? - ls1truck.com Simply put, the Gen III is easy to swap and cheap, and the Gen IV has better heads and more complexity. The intake port forms the final part of the air induction system in an engine. Although there was only a 2.5 cc difference in chamber volume between the two models, this did not result in an increase of power on our test engine when evaluated on a dyno - suggesting other factors are also important to consider when assessing performance potential. Some LS2's also came with the 799 heads. In many ways its the 327 of this era. The main difference between the two is from which mold casting the two cylinder heads originally came. 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. 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! The 243 and 799 cylinder heads are practically the same, with only minor differences in port and valve sizes. I plan on having the mill the block and heads, but would like to do the rest of the build myself. 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. looking for reliability with a little get up. Pulling 799 Heads off a RARE LS Powered Junkyard Vehicle for - YouTube Thanks. Lets talk about bottom-end upgrades. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). Typically, the D-shaped port helps increase the flow of exhaust gases. For example, should you opt for theChevy 799 heads, or are the LS 243 cylinder heads better? Condition: Remanufactured - Exceeds OEM Specifications. On the left is a Gen IV, on the right is the Gen III. Usually about 7.425, but we recommend the use of a length checker before ordering just in case. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. Which one do you think would be better and what unexpected changes are needed for both. 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. and wont support more than about 380 whp, but thats an easy fix. 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. im looking into getting 600whp will the stock heads get me this with a 80mm turbo? The cylinder head gasket is one of the most over-engineered and stressed components in an internal combustion engine. This helps to reduce the compression ratio, resulting in improved combustion efficiency and increased power output. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. Heres a table with common performancerotating assembly combinations. What made the 317 heads both kissed and cursed was the combustion chamber size. Aki Ito. Flat Top (2007-09), Flat Top with valve reliefs (2010-11). They also had larger 2.00 intake valves than the Gen III. This time on SPPTV we head to our favorite junkyard to snatch some 799 LS cylinder heads we received a tip about. The 4.8L has a 3.27-inch stroke, and the 5.3L has a 3.62-inch stroke. 799 cylinder heads have a compression ratio of 9.5:1. This helps to guarantee whether the channel of the cylinder head is reliable. any recommendations would be appreciated. The 799 cylinder heads are in the similitude of the 2004 LS2 cylinder heads due to the triangle casting marks similarity. The smaller combustion chamber with a higher compression ratio offers increased power output. History of the LS Engine and Cylinder Head Casting Number - MotorTrend The cylinder heads intake port and exhaust port shapes are cathedral and D-port, respectively. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. They are built with sophisticated architecture, including a cathedral-shaped port with smaller combustion chambers. 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. isnt a problem with dual valve springs. I like the idea of 100 hp with a BTR 550 lift it has 799 heads but was thinking AFR mongoose with upgrade trunion and springs. 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! Here are some articles that might interest you: Symptoms of Bad Slave Cylinder and Replacement Cost. We are talking about the 5.3L here, so let's look at the heads they came with. For a primer on the entire LS engine universe, readLS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family.]. I have a 2012 silverado 1500 crew cab. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. The LS engines designed with 799 heads were 5.3L and 4.8L truck engines. 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 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. 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 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. Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. Compression Ratio & Combustion Chamber Size | GMC Truck Forum Ultimately, its up to you to decide which cylinder head best suits your needs. open. It proves beyond doubt that Capizzi has what it takes to compete at even higher levels and be successful in any challenge or race he enters into! I got the diameter but Im needing the length. Looking for 400+ hp at the wheels naturally aspirated? The Mini-Delphi/Multec II connector 25-pound injectors are a limitation at around 380 whp. 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. The799 LS headshave a cathedral-shaped intake port. I would also like to keep my 799 heads as well. All rights reserved. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in. Not knowing it is a vin(b) 5.3 l33ho. S. 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. Or replace old parts? These are best for high-compression builds and really need larger valves and porting work. This put it within 2.5 cc's of the 706, meaning there was only a minor change in static compression between the two. 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. If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. To run the newer style 6-pin throttle body requires a Torque Rush X-Link harness adapter. 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. This was an engine specifically designed to surpass the power and performance of the LS1, and it certainly achieved this goal with flying colors. We think it might, but only at extreme levels that might tax the flow limit of the 706 heads. Not really an expert, Your email address will not be published. Want to dress engine up. Evidence will be water in the oil and sludge buildup under the valve cover. The flat-top L33 pistons added some much needed compression. 799 heads users can verify the valve seating of the cylinder heads by engaging vacuum and pressure testing. In 2008 and 2009, Chevy also had a simpler 5.3L engine designated the LH8, which can be identified by the letter L in the 8th digit of the VIN. 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. The Gen. 3 aluminum block L33 engine came in Chevy and GMC trucks from 2005-07. The 209cc intake ports flowed as expected, but the 74cc exhaust ports were not quite up to snuff. 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 243-cylinder head often causes sediment buildup in the fuel tank, which later on clogs the fuel filter and causes engine problems. Bore 2/4 = 2.326 in. Learn how your comment data is processed. You need the main info about your engine components to get the right numbers. The 5.3L debuted in 1999 as the base engine for the Silverado and Sierra truck line as the Gen III until 2005 when the Gen IV appeared. Summit Racing has created a series of comprehensive guides for each engine in the LS family, so engine builders and tuners can have a handy reference for their projects. 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. WE HAVE OVER 2,000 CYLINDER HEADS IN STOCK READY TO SHIP! L33 5.3L Engine Upgrade Guide: Expert Advice for L33 - OnAllCylinders With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. Share with your Friends!Facebook @ SPPTV YouTubeInstagram @ SPPTVonYouTubeSnapchat @ SPPTVPO BOX:Rob ExnerPO BOX 99900 LX 087 592RPO GARDEN CITYWINNIPEG MB R2V 5A2CANADA [Editors Note:This L33 engine upgrade guide is part of a series ofLS engine upgrade guidesassembled by a team of LS experts at Summit Racing that we are sharing at OnAllCylinders. 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. 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. If youre getting forged pistons, upgrade toforged connecting rodsat the same time. 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. 13 Step Process for Remanufacturing Cylinder Heads, Cylinder Heads for the Chevrolet 350 - What You Need to Know. You may want to check out for your next porting job. 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 243 and 799 numbers reveal the original molds out of which these castings were constructed. Learn how your comment data is processed. That can change if the heads are milled too. Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. The LT series engines are beyond the scope of a cheap 5.3L for now. This will definitely free up a few horsepower and gives the little engine a big personality. We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. If you're going to be driving on the street, you won't need as much power as someone who will be racing their car. Sometimes referred to as the LS6, the LQ4 is a 6.0 litre member of General Motors' Vortec engine family. The 5.3L uses a Roll Master billet timing set with a Torrington bearing, and an LS2-style chain damper. When it comes to L98 cylinder heads, they are very similar to the LS3 heads. (Information for this article originally appeared in thisUpgrading the Gen. 3 5.3L, Aluminum Block, LS Truck Enginearticle atSummit Racings searchable database of FAQ tech info. They can be cut to 2.000-inch to fit the standard valve seats and extend the rpm range up to 7,000 rpm. Are 862 Heads a Better Choice? - Allied Motor Parts Is It a 4.8L or a 5.3L Engine?Spotters Guide. The only difference is that they utilize a heavier solid stem intake valve. Additionally, we offer a wide variety of 799 heads to choose from, so you're sure to find the perfect match for your machine. Can You Trade in a Car With Expired Registration? 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. This further improves airflow and power output from your engine without compromising efficiency or torque production levels. 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? The 243/799 heads came on the 5.3 "L33 HO" motor in 05. The peak flow numbers differed by just 7 cfm at 0.700 lift. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower. Another bonus of the L33 is it had beefier connecting rods than earlier Gen. 3 engines and had full floating pins. Are the 799 heads on LS1 interchangeable? A 205cc runner head is a good match with the TBSS intake. While the 799 heads offered the most flow, it was not necessarily an advantage on our test engine. These heads are for a new project that will be beginning soon on the channel, more on that soon! Maybe at elevated power outputs and/or boost levels where maximum flow is needed the other heads might begin to shine, but just look at the dyno results to see how well GM designed the 706 heads to work on a 5.3L (even a modified one). LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Economical upgrades for 243/799 heads | LS1GTO Forums However, if you're planning to drive in hot weather or at high altitudes, you'll need an engine that can handle harsh conditions. That will determin what pushrod to go with. The idea was to flow and measure each head, then follow up with the all-important dyno testing. Looking at the BTR Stage 3 truck cam. This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance. The DOD, later called active fuel management (AFM) bungs, will be obvious on the Gen IV engines. If you are looking for a LS-series engine to build, the Vortec-series 5.3L is arguably the best choice for the dollar. The Gen III has the 24x reluctor on the crankshaft and can be run with a cable-driven throttle body and factory computer. On the EcoTec3, the timing chain, water pump, and heads are all very different. Converter recommended. 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. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. It still has the same 24X reluctor ring, cam sensor location, knock sensor location etc. Both heads had 2691 Show more Show more It's. Ive got the engine tore down and ready to go to the machine shop. The size of the combustion chamber is the major challenge with swapping to 799 heads. 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. As a result, they have become some of the best performing cathedral port factory heads available on the market today. (Is It Bad to Remove Them? 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. There is one major challenge when it comes to swapping to 799 heads the size of the combustion chamber. Thanks. In fact, it is estimated that these heads can increase horsepower by up to 25 hp and boost total power output by 3-4%. Reynoldo, youll love it after doing a LS swap. Generally,supercharger cams and nitrous cams will have slightly more lobe separation and longer exhaust duration. Inside are ARP mains and head studs, and an M365 Melling oil pump. 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. Come join the discussion about Silverados, Sierras, and other full size trucks . They can be found for around $1,300 which is inexpensive for an aluminum block engine. If youre going over 800 hp, a set of .200 in. link to Alternator Overcharging - Causes and Fixes, link to LS Head Bolt Torque Specs and Sequence. Dyno testing revealed that at certain lift points, the 799 heads were able to outflow their predecessors by as much as 20 cfm. The L33 engine block has a 3.780-inch bore diameter. The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. For many people, selecting suitable cylinder heads can be pretty tricky. The 799-cylinder head also weighs 26 lbs, the same as the 243 one. An electric fan kit will free up that power. The 4.8L has a 3.27-inch . The size of the chamber can affect power and efficiency. The increased chamber volume of 6.5 cc's dropped the compression ratio by nearly 0.80 points. This is revealed in the 799 head specs outlined above. Youre making more power than that.. Wind her out to 7k rpm with that intake for an accurate hp/tq figure.