As expected, the 799 heads offered the highest peak flow, with 250 cfm coming at 0.700-inch liftthough a value not generally relevant to most LS enthusiasts. A larger port volume results in more power, decreasing fuel economy. According to Internet folklore, the 317 heads used on the 6.0L truck engines share the intake port design with the 799 (243) heads. The799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. 799 Heads: All About 799 LS Heads & Their Application. 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. When it comes to L98 cylinder heads, they are very similar to the LS3 heads. That, my friends, is another test for another day! The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. It was actually the 8th digit of the vehicle identification number. So all the way up to the end of 2013. i just called the dealership and they was able to ans all my quest. The 799/243 will kill what little compression you have now unless you mill them. I'd probably be incline to limit the chamber size to 61cc or 62cc. Even though the aluminum L33 weighs basically the same as the iron 4.3, except it makes 315 N/A HP instead of 190hp. Bore 3 = 2.307 in. Trans computers were external early on and switched internal later. Apr 26, 2023, 2:58 AM PDT. A higher compression ratio means more power with less fuel in the cylinder and fewer exhaust gases. The 243-cylinder head often causes sediment buildup in the fuel tank, which later on clogs the fuel filter and causes engine problems. 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. Or replace old parts? have an aluminum build that can withstand high temperatures. An increased compression ratio results in more power output. You can find moreLS engine spec guides and LS-relatedinformationhere. after bottom dead center and alter the intake valve opening to set the idle quality. 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. They have far outflowing capabilities compared to their cathedral-style counterparts, making them one of the top LS cylinder head options available today. First, you want to avoid the Gen III heads with the "battery" castingthey are crack prone. This is because the cylinder heads come with 64cc combustion chambers. 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? 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. The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. If you are changing the pistons, look for the Gen IV heads to get the airflow and the compression bump at the same time. It is no surprise that the 317 heads made the least power. 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. Before beginning the tuning process, we recommend installing a colder thermostat to open up the tuning window. 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 cylinder heads come with a sophisticated architecture that delivers high-quality performance and efficiency. Looking for 400+ hp at the wheels naturally aspirated? In fact, it is estimated that these heads can increase horsepower by up to 25 hp and boost total power output by 3-4%. These engines used a 24x crankshaft trigger wheel and a cam sensor mounted at the rear of the camshaft. The LT series engines are beyond the scope of a cheap 5.3L for now. Although an iron block 5.3 will handle more power, the L33 can still support over 850 whp. Which one do you think would be better and what unexpected changes are needed for both. Whether you are looking to upgrade your current vehicle or build something from scratch, the LSX 454 can provide the power and durability that you need for success on any road or track. The intake is the factory Gen IV truck manifold and will be run using a stock computer and HP Tuner software. Bought a perfect running truck for 2800$. 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. Keep in mind, the original throttle body had an 8-pin connector. 5.3L and 4.8L truck engines are LS engines designed with 799 heads. Hey Allen, Cool ride! Brian I have a 06 L33 4wd Silverado I am wanting to build it up a bit. A lot has been unveiled about 799 heads. It plays a significant role in selecting suitable heads because it will ultimately determine the compression ratio. The factory 5.3L designations are LH, LY, LM, LC, or L8 instead of LS (the exception is the FWD LS4). If you're uncertain, here are a few factors to consider before going for 799 heads. Note that a reliable channel will eventually guarantee a perfect compression. You'll want to consider it if you're looking for increased performance. 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. The 799 cylinder head distinguishes the 5.3L from other engines due to the compression ratio. The799 LS headshave a cathedral-shaped intake port. are some of the most popular heads used in LS engines. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. Which came out in the 2014 model years. 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. But most other engines with 5.3L (HO) or 4.8L feature 799 heads, especially those made after the mid-00s. 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. I dunno, milling to 59cc combustion chambers would be nearly 11.2 CR. In 1999-2000, LQ4s came with #373 or #873 heads that had 71cc . here are some fuel rail covers for the LS engine, but we couldnt find ones that specd the 5.3L precisely. I would imagine the 799's are the same, if not they should be close to that. And for $90 why not. These volumes are larger than most other heads available, allowing more air to enter the combustion chamber and be expelled through the exhaust pipe, resulting in increased power output while reducing fuel consumption. 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! 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. The 243 and 799 cylinder heads are practically the same, with only minor differences in port and valve sizes. This record is an incredible milestone in the motor racing industry, and it truly showcases Capizzi's talents as an expert driver and racer. You will sometimes hear the Vortec engine referred to as LS because the basic engine design is the same. (Solved). 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. Hello, Im wanting to delete the DOD in my 2011 Sierra 44 with a .525 or so cam, I am wanting to know the best parts I should use for lifters, push rods, maybe 1.8 rockers, springs, bushings, locks & or injectors. The factory main caps arent doweled. link to Alternator Overcharging - Causes and Fixes, link to LS Head Bolt Torque Specs and Sequence. The valves on each type of cylinder head can vary. Car Wobbles at a Very Low Speed (Causes and Fixes). The square port design reduces air turbulence, allowing for greater airflow and improved combustion efficiency along with a smoother idle and more efficient overall operation. 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 Swapping a L33 into a 96 Silverado with a fresh NV3500. Youre making more power than that.. Wind her out to 7k rpm with that intake for an accurate hp/tq figure. 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. Depending on how much power you intend to make, upgrading to largerfuel injectorsmay be needed. What heads came on LQ4? The large combustion chambers were likely to blame, as the 10cc increase in chamber volume resulted in a drop of the static compression ratio by 1.2 points (from 9.5:1 to 8.3:1). Engine Size: 5.7L - 350ci - V8. 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. But . The question now is where that limit occurs. Call us today. 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. But on the upside, both respond equally well to porting. 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 6.2 liter, 376 cubic inch engine churned out an impressive 638 horsepower, making it an ideal choice for those who demanded serious power and performance under the hood. To put it simply, Chevrolet Performance's LSX 454 crate engine is a powerhouse. All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. The result: increased horsepower with improved fuel efficiency. The exhaust valve should ideally be 85 percent of the size of the intake valve. 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 241 heads performed slightly better than the 317s, and the 799s were better still. Porting and polishing help improve airflow by opening the intake and exhaust ports. They should have 64cc chambers. The L33 intake wasnt particularly good and had a 3-bolt 78mm DBW throttle body. This also helps reduce emissions by allowing more complete fuel combustion in each cylinder. The 243-cylinder head has eight valves per cylinder (2 per valve) which help increase airflow into and out of the combustion chamber for improved engine performance. . Is this an error on your statement of facts about the specific vehicles it was in or do I have something special? Both are great high-performance options for your engine that will offer excellent power and fuel efficiency without sacrificing reliability. WE HAVE OVER 2,000 CYLINDER HEADS IN STOCK READY TO SHIP! As stated above they are the same as 243 heads with a different casting method. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. I forgot to add I will not be using boost and what would be the best fuel rails and injectors? 799 heads (65cc chamber and 210cc intake runner) are pretty much 241 LS6 heads worked over for truck. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. Today, more than 15 years later, General Motors' LS3 series of engines are still going strong and continue to be a popular choice amongst performance car enthusiasts everywhere. Reynoldo, youll love it after doing a LS swap. Are the 799 heads on LS1 interchangeable? This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance. Therefore, regardless of which head you choose, you will still receive maximum power from your engine. If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. It is an aluminum block. 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. For many people, selecting suitable cylinder heads can be pretty tricky. If you are looking for something a pretty stout and you put a 2,500 rpm converter in it (or stick), you might want to bump up to the SUM-8713. I have a 2006 L33 and a 6 speed manual trans going into a 63 impala. 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. They can be cut to 2.000-inch to fit the standard valve seats and extend the rpm range up to 7,000 rpm. Ive got the engine tore down and ready to go to the machine shop. Since the cylinder heads come with a smaller combustion chamber, you will have to mill the cylinder heads to a minimum of 0.025 to cover up for the former bigger combustion chamber size. At Allied Motor Parts, we provide 799 LS heads for sale to customers who only want the best for their engines and do not compromise on quality or performance. . Vin.Seventh digit is 7. 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.

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