(Summit RacingsPaul Spurlock and Brian Nutter contributed to this article.). I am searching for all these at the local JY but am torn on what way to go. The test engine was an easy choice, as the 5.3L was the go-to engine, especially for the power-adder crowd. They are okay naturally aspirated, but are the weak link with boost and you probably know a guy thats popped one. The 243-cylinder head often causes sediment buildup in the fuel tank, which later on clogs the fuel filter and causes engine problems. This was an aluminum blocked engine that had the 243/799 heads but didn't have AFM/DOD or VVT. Additionally, this cylinder head boasts a chamber diameter of 3.876 inches, providing plenty of space for combustion and can help increase combustion efficiency when paired with other correctly sized components in your engine setups, such as pistons and rings. The 799 LS heads have a smaller combustion chamber of 64cc. When testing the 5.3L heads, the 706 and 799 heads were compared to determine which offered the most flow. making 310hp (235kW). 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're uncertain, here are a few factors to consider before going for 799 heads. Simply put, the Gen III is easy to swap and cheap, and the Gen IV has better heads and more complexity. If youre looking for the last bit of power, the long runner FAST LSXR-T is recommended and accommodates larger102mm throttle bodies. The 5.3 "LM4" is what I have in my Rainier and it had a short production run and was used in the 03-04 GMT360 vehicles and the SSR. The L33 engine block has a 3.780-inch bore diameter. Why Chevy 706 Heads LS Make a Great Choice? 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. The L33 intake wasnt particularly good and had a 3-bolt 78mm DBW throttle body. As a result, they have become some of the best performing cathedral port factory heads available on the market today. Or replace old parts? 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. 799 heads are some of the most recent cylinder heads on the automotive parts market. So lets look at the 799 heads and what makes them a nice choice for a porting job. 243 Heads: All About 243 LS Heads & Their Application, Unleashing the Power of LS2 Heads: Everything You Need to Know, HIGH-PERFORMANCE GM LS-SERIES CYLINDER HEAD GUIDE, Over 2,000 Available, all Makes and Models, Highest Quality with Triple Angle Valve Work. Cam Motion ground the cam with 223/229 duration at 0.50; 596/596 lift on an LSA is 117. Alternator Overcharging - Causes and Fixes. This further improves airflow and power output from your engine without compromising efficiency or torque production levels. 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. The DOD, later called active fuel management (AFM) bungs, will be obvious on the Gen IV engines. 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. Keep the above-mentioned points in mind when choosing the right cylinder heads. These cylinder heads feature a rectangular port design, which is also found on 6.0L truck engines and the Pontiac G8 6.0L engine. 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. 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. However you seem to state that it was available until the 2011 model. Designed specifically for a 6.0L application, the 317 heads also had the largest chamber diameter of 3.923 inches. The 243 and the 799 cylinder heads are practically the same. It plays a significant role in selecting suitable heads because it will ultimately determine the compression ratio. Only issue is I want to keep my cable throttle body and Im not ide how I can run a gen ov block with a Gen 3 ecu. 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. The exhaust valve should ideally be 85 percent of the size of the intake valve. The stock rockers are good up to 175 lbs. On the other hand, some cylinder heads are designed with the best architecture that delivers top-notch power output with increased horsepower. 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. Brian I have a 06 L33 4wd Silverado I am wanting to build it up a bit. 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. I got the diameter but Im needing the length. 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. Aluminum is a good material of choice because it is lightweight yet durable. The exhaust port volume specifies the total amount of exhaust gas that can flow out of the cylinders during the exhaust stroke. These heads are for a new project that will be beginning soon on the channel, more on that soon! 4X4 . With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. 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. Additionally, this OEM part features hardened valve seats for extended life as well as precision machining that ensures precise fitment to your existing motor and components. The Evolution of the Vortec Truck Engine - Lowbuck LS 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 valves are responsible for letting air and fuel into the cylinder and the exhaust from that combustion out of the cylinders. The implications differ for both scenarios. REMEMBER--just because the heads say '243' doesn't mean it has the lighter weight valves and upgraded valvetrain like the 243 heads that were on the Z06 Corvette. For example, should you opt for theChevy 799 heads, or are the LS 243 cylinder heads better? Lets talk about bottom-end upgrades. The configuration allows for a higher compression ratio, resulting in more horsepower. As such, they are a great choice for those looking to get more out of their engine with minimal effort. 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. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. Even though the aluminum L33 weighs basically the same as the iron 4.3, except it makes 315 N/A HP instead of 190hp. The cylinder cast architecture is with a semi-permanent mold method. It also has a 7 for eigth number of Vin in my 2012 Silverado. 5.3L Chevy LS Engine Spotters Guide and Budget Build - MotorTrend This can positively impact a vehicles engine performance and efficiency. Not air raid intake runners. Any tips and pointers for this? For example, should you opt for the. Lq9 With 243 Heads Compression Ratio | caredcar.com document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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? If you are changing the pistons, look for the Gen IV heads to get the airflow and the compression bump at the same time. I am swinging back and forth with LQ9, L33 or L92. But on the upside, both respond equally well to porting. what recipe should I look into? The 241 heads, compared to the 706 heads, offered larger 68cc combustion chambers, which meant a drop in compression of roughly 0.70 points. The first order of business was to identify and round up a selection of popular LS factory heads. 13 Step Process for Remanufacturing Cylinder Heads, Cylinder Heads for the Chevrolet 350 - What You Need to Know. Manufacturer: Chevrolet. Both heads had 2691 Show more Show more It's. Depending on how much power you intend to make, upgrading to largerfuel injectorsmay be needed. The LQ4 also featured an upgraded valve train, camshafts and larger injectors which allowed for increased power output when combined with aftermarket parts such as cold air intake systems or exhaust upgrades. When you are getting a donor engine, be sure and get the entire harness and throttle pedal if its a fly by wire throttle body. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. Like most auto parts, cylinder heads can eventually crack or fail for various reasons. My rear is set with 3.42 gears and a locker. Next to the 706 heads, the 799s featured the smallest combustion chamber at 64 cc. This E-Rod crate LT1 is from Chevrolet Performance. As you have most likely caught on by now, these two cylinder heads are practically the same. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. 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? This particular cam offered an impressive 22 lb-ft increase in torque when compared to other cams available for the 5.3L, peaking at 4,400 rpm before falling off again. 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. and wont support more than about 380 whp, but thats an easy fix. The massive chamber volume of 71.5 cc's put them a full 10 cc's over the 706 heads. The aftermarket is strong,crate enginesare available, and used motors are often cheaply sourced through junkyards. Evidence will be water in the oil and sludge buildup under the valve cover. Are 862 Heads a Better Choice? - Allied Motor Parts If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. If you upgrade and depending on the injectors you run, you may need a fuel injector adapter harness. So all the way up to the end of 2013. i just called the dealership and they was able to ans all my quest. 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. Hunter, the BTR Stage 3 truck cam is nice. The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. The engine specs and information listed here is for a stock LC9 engine. 799 heads (65cc chamber and 210cc intake runner) are pretty much 241 LS6 heads worked over for truck. Its better to reduce ignition timing and compensate with added boost to reduce the cylinder pressure spikes that lift heads and cause the main caps to dance. I have the same year and the 8th character is a 7 also. 706 5.3L Truck Castings Valve size: Intake- 1.89, Exhaust-1.55 Port Volume: Intake- 197cc, Exhaust- 69cc Combustion Chamber: 61.5 cc Benefits of Casting Chevy 706 Heads Most affordable, powerful, and effective Superior to 862 heads in reliability and performance Flow is excellent and superior to 317 heads, suitable for many builds However, it's important to note that porting is a delicate process. The best way to be sure is to use this spotters guide and look carefully at the block and heads. 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. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. Or they had them in stock at the factory and used them till they were gone! You need the main info about your engine components to get the right numbers. Another factor to consider is whether or not the heads have been ported and polished. At best, flow numbers indicate potential power, but we are getting ahead of ourselves. Additionally, we offer a wide variety of 799 heads to choose from, so you're sure to find the perfect match for your machine. I am looking at 5.3 with 862 heads to put in a 1950 fleetline. In addition, the 799 heads deliver increased power output on the 5.3-liter truck engine. 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. The cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. isnt a problem with dual valve springs. 19355573) offers 21st century big-block power with an impressive 627 horsepower at 6,300 rpm and 586 lb-ft of torque at 5,100 rpm. Your email address will not be published. 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. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. This time on SPPTV we head to our favorite junkyard to snatch some 799 LS cylinder heads we received a tip about. The 799 LS heads have 2.00-inch intake valve. Dyno testing revealed that at certain lift points, the 799 heads were able to outflow their predecessors by as much as 20 cfm. 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. To maximize torque in the mid-range in a truck cam, manufactures close the intake valve at about 35-40 degrees (@.050 in.) Single turbo systems using. 9 Minutes Read / What did LS 862 heads come on? They come with smaller chambers compared to some of their counterparts with rectangular ports. The intake port volume for 799 LS heads is 209 cc. These 799 heads are the latest model and are made using the semi-permanent mold method. The 799 LS heads have a 1.55-inch exhaust valve size. You also need to consider the type of vehicle you have. The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. 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. These motors are capable of making a lot of horsepower, and respond well to upgrades like turbos, superchargers, high-flow cylinder heads, intake systems, cams, and nitrous oxide. 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? All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. The 799 cylinder heads are in the similitude of the 2004 LS2 cylinder heads due to the triangle casting marks similarity. . 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. The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. They also had larger 2.00 intake valves than the Gen III. I have a 5.3 in my Pontiac Solstice. 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. The only difference is that they utilize a heavier solid stem intake valve. According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads. 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. 799 Heads: All About 799 LS Heads & Their Application. 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. The size of the combustion chamber is the major challenge with swapping to 799 heads. 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. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. The L33 swap is a pretty common one as LS1s are getting hard to find. 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 799-cylinder head also weighs 26 lbs, the same as the 243 one. I like the sum-8712 cam idea, but my issue might be keeping it under the hood. The increased chamber volume of 6.5 cc's dropped the compression ratio by nearly 0.80 points. Should Copper Spray Be Used on a Head Gasket? The early part of his automotive career included working for engine builders Scott Shafiroff and C.J. The factory cam is tiny and really holds the engine back. To run the newer style 6-pin throttle body requires a Torque Rush X-Link harness adapter. The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. 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. Finally, you'll want to take the compression ratio into account. Converter recommended. My son and I are looking for the L33 now for a swap into his 1992 F150 extra cab short bed. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. Some trimming of the intake and alternator bracket may be required. Check out the dyno graphs to see how much the 317s lost on this 5.3L test and you might think twice about what you choose for your next turbo LS. 799 Heads - Everything You Should Know - Rx Mechanic History of the LS Engine and Cylinder Head Casting Number - MotorTrend A larger port volume results in more power, decreasing fuel economy. There is one major challenge when it comes to swapping to 799 heads the size of the combustion chamber. Stumbled across a 2005 ext cab Silverado. If you're uncertain, here are a few factors to consider before going for 799 heads. , or are the LS 243 cylinder heads better? looking for reliability with a little get up. Started jumping up and down. 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! Is It a 4.8L or a 5.3L Engine?Spotters Guide. kind regards. 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. open. 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. The exhaust valve is responsible for expelling the burnt gases off the combustion chamber of an engine after the power stroke. This might be another good indicator on how well they work on the small-bore 5.3L.

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