Another bonus of the L33 is it had beefier connecting rods than earlier Gen. 3 engines and had full floating pins. These heads are said to be basically the same as the 243 head everyone gets a boner for. 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. 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? It was actually the 8th digit of the vehicle identification number. Year Range: 97-04. Something to keep in mind is the 2004 and later engines (even Gen. 3) had two head bolt lengths vs. three on the earlier engines. when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). It also accommodates a 90mm throttle body, but doesnt clear the truck accessory drive without modification. 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 Coefficient of Discharge is a calculation of the airflow versus valve sizing, and gives a much more accurate picture of the power potential of these heads. They come with smaller chambers compared to some of their counterparts with rectangular ports. While General Motors first launched the LS3 series of engines in 2008, it was initially installed in the C6 Corvette. someone to get original picture of motor and transmission with this trim and year of truck its much appreciated. 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. The implications differ for both scenarios. The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. (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. 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. The main difference between the two is from which mold casting the two cylinder heads originally came. These 799 heads are the latest model and are made using the semi-permanent mold method. . wall tool-steel pins is a good idea. Great article! Go there and search LS engines for a comprehensive collection of LS engine tech information.). Aftermarket heads reduce downtime and are cost-effective when you sell your old heads in good condition. A higher compression ratio leads to increased power output, which also means increased heat inside the engine. 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. 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. Learn how your comment data is processed. what recipe should I look into? 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 799 Cylinder Head is made from lightweight aluminum that helps reduce weight while still providing superior strength. Aki Ito. 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. 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. looking for reliability with a little get up. When it comes to modifying the L33, its easiest to think of it as a small bore LS6. My rear is set with 3.42 gears and a locker. 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! Heads and intake good for another 50+ hp. ), Why Do People Cover License Plates? The LT series engines are beyond the scope of a cheap 5.3L for now. The799 headshave an aluminum build that can withstand high temperatures. These are best for high-compression builds and really need larger valves and porting work. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. The 243-cylinder head was mostly used on the LS6 and the LS2 engines. The 799 heads cc are smaller compared to its counterparts because of its smaller combustion chamber. Trans computers were external early on and switched internal later. So check out our selection of 799 heads today and get the power and performance you need. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. Ask your tuner what injectors they prefer and have them ready to save yourself an extra trip to the dyno. Its V8 configuration also provides an efficient combination of power and fuel economy, so you wont have to worry about breaking the bank when refueling after a long day out with friends or family. The L33 is a returnless system. I want to switch my 04 ls1 long block out for a l33 because I want to boost over 7psi. However, you may also find some heads made from cast iron. The 799 cylinder head was mostly used on the L33, which is the aluminum block version of the LM7. 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. As you have most likely caught on by now, these two cylinder heads are practically the same. RPO code in glovebox listing LC9 confirms it. 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. This helps to reduce the compression ratio, resulting in improved combustion efficiency and increased power output. Any other recommendations or required mods are welcome. This further improves airflow and power output from your engine without compromising efficiency or torque production levels. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. Raising the factory redline is a big part of this because it allows your vehicle to be in the meat of the powerband longer. It was actually the 8th digit of the vehicle identification number. While this could be seen as a positive trait of the 799 head, its chamber volume was only 2.5 cc's different from that . Our testing showed this to be at least partially plausible as the flow numbers were similar, though not identical. The result: increased horsepower with improved fuel efficiency. One of the better factory LS heads you can find in a junkyard. 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). Dyno testing revealed that at certain lift points, the 799 heads were able to outflow their predecessors by as much as 20 cfm. An electric fan kit will free up that power. The 243 and 799 cylinder heads are practically the same, with only minor differences in port and valve sizes. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. If you are looking for 799 LS heads,Allied Motor Partsis the best place to get them. Just want it running before winter. This powerful engine (part No. The 799 head cc is pretty smaller compared to some others. This process can be time-consuming and costly if not done correctly, so its important that you understand all of the potential pitfalls before attempting this swap. However, ensure to consider the pros and cons of swapping your current cylinder heads to 799 heads before a porting job. Wanting to go with 5.3 since its a bit cheaper and dont care that Ill be loosing performance. Which came out in the 2014 model years. The aftermarket is strong,crate enginesare available, and used motors are often cheaply sourced through junkyards. Main studs should be added any time youre this deep in the engine. This is Nate Bush's 5.3L long-block build from Custom Performance Racing (CPR) that can handle more than 1,000 RWHP on boost. 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. Still can drive daily. The factory cam is tiny and really holds the engine back. I have the same year and the 8th character is a 7 also. i have every length exc for valves but i would just call the dealer and they can give u the lenght and pt#s if u need anytging else for stock 5.3 info i have it. They can handle about 750+ hp and 7,000 rpm in boosted applications (at least for a while). In fact, they can make more power than a LS6 or LS2 with boost due to the thick cylinder walls. So lets look at the 799 heads and what makes them a nice choice for a porting job. As such, they are a great choice for those looking to get more out of their engine with minimal effort. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. Manufacturer: Chevrolet. The 243/799 heads came on the 5.3 "L33 HO" motor in 05. Of course, the 799 heads are good. Sometimes referred to as the LS6, the LQ4 is a 6.0 litre member of General Motors' Vortec engine family. Im building for factory reliability but adding a little boost for some extra power. Both the 243 and the 799 cylinder heads are General Motors' 3rd generation cylinder heads designed for V8 trucks, performance engines, and SUVs. I just bought a low mileage L33 with only 53k on the clock. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. It marked a significant milestone in GM's LS series engines as it showed that adding a supercharger could result in incredible power gains while still retaining its reliable nature and longevity. Swapping a L33 into a 96 Silverado with a fresh NV3500. Generally,supercharger cams and nitrous cams will have slightly more lobe separation and longer exhaust duration. 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. Many ported 799 heads are made from aluminum, which is a good choice because it's both solid and lightweight. The cherry on top is its not saddled with Variable Valve Timing (VVT) or Active Fuel Management (AFM) found on some Gen. 4 engines. I am searching for all these at the local JY but am torn on what way to go. Therefore, regardless of which head you choose, you will still receive maximum power from your engine. 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. Hi, Im looking at putting an L33 into a Barbarian V8 motorcycle custom built to take an LS engine, it will be married up to a single speed direct drive gearbox, will not be able to use its usual intake due to space under the fuel tank so what would be the best lowest profile intake/throttle body unit I could use without sacrificing performance, what would the best cam to use given the direct single drive, like the lumpy sound yet be a daily driver, Frame in transit at the moment so just looking at a direction to go with its powertrain. The 799 LS heads have a D-shaped port. However, unlike the 243 heads, they do not require cleaning. This Cylinder Head has a core charge of $200.00 included in the cost. Is It a 4.8L or a 5.3L Engine?Spotters Guide. And for $90 why not. These heads are for a new project that will be beginning soon on the channel, more on that soon! They offer excellent performance with increased horsepower making it a preferred choice for a porting job. 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). 799 is a 5.3 liter head. Tuning the computer changes the fuel and ignition curves to increase performance. Whether it was a Corvette, Camaro or Pontiac GTO, the 243 heads provided superior performance no matter what vehicle they were installed in. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. Keep in mind, if you're running a cam in the 230 range, piston to valve clearance needs to be checked and fly-cutting may be required. At best, flow numbers indicate potential power, but we are getting ahead of ourselves. Wondering if a L92 is even feasible. 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 243-cylinder head often causes sediment buildup in the fuel tank, which later on clogs the fuel filter and causes engine problems. Like the 317s, the 241 heads out-flowed the 706 heads, but once again, that airflow did not translate into power production. The 799 heads offered the most flow, bettering the 706 heads by as much as 20 cfm at some lift points. 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. Your email address will not be published. Some trimming of the intake and alternator bracket may be required. With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. Aluminum is a good material of choice because it is lightweight yet durable. In other words, compression ratio can be defined as the ratio of the volume of the cylinder and its head space when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). If you're uncertain, here are a few factors to consider before going for 799 heads. Where Are Head Gaskets Located on an Engine? Despite larger exhaust port volumes than either the 706 or 241, the 799 heads offered the least exhaust flow of the bunch, with a peak of just 191 cfm. I'd probably be incline to limit the chamber size to 61cc or 62cc. Description: CNC Ported LS1/LS6 243/799 Cyl Heads .650 Springs 2.02/1.59 Valves PAIR. The size of the valves affects the performance of an engine. Wont really be a daily driver but a toy I can get out and turn heads with. I PUT A STAGE 1 TSP TRUCK CAM WITH AIR RAID INTAKE AND DYNOED 283WHP AND 302WTQ. The specifications are almost identical; therefore, the cylinder heads are fully interchangeable, and they offer the same power output. The accessory drive will swap over, but theres a chance youll need to drill and tap one of the holes for the alternator bracket. Youre making more power than that.. Wind her out to 7k rpm with that intake for an accurate hp/tq figure. . Have a 2000 Z28 intake on it. This was an aluminum blocked engine that had the 243/799 heads but didn't have AFM/DOD or VVT. What intake should I use? For marketing purposes, it was also known as the Vortec 5300. They offer excellent performance with increased horsepower making it a preferred choice for a porting job. This E-Rod crate LT1 is from Chevrolet Performance. The 243-cylinder head has an intake port volume of 210 cc and an exhaust port volume of 75 cc. Meanwhile, a reduced compression ratio results in a cooler burning temperature. It is going to face "all the boost," which means 35 or more pounds making 1,000 lb-ft to the tires. So, in the debate of 799 versus 243 heads, it can be determined that they are completely identical and interchangeable with one another. For many people, selecting suitable cylinder heads can be pretty tricky. Funny, I have a 2013 Silverado LT 1500 Z71 and the 8th character of my VIN is 7 also. Daily driver with a above average cam. Why Chevy 706 Heads LS Make a Great Choice? 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 You'll also want to consider how often you drive and what kind of conditions you'll be driving. This makes it ideal for those who want to reduce the weight of their vehicles without having to compromise on power or performance. It also has a 7 for eigth number of Vin in my 2012 Silverado. I would also like to keep my 799 heads as well. 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. The799 LS headsare some of the most popular heads used in LS engines. 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. Meanwhile, some vehicle enthusiasts and professional auto mechanics opine that swapping to 799 heads is worth it. Stay away from the LS4 from front-wheel-drive cars. But . 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. SMASH THAT SUBSCRIBE BUTTON! The L33 swap is a pretty common one as LS1s are getting hard to find. Inside are ARP mains and head studs, and an M365 Melling oil pump. That can change if the heads are milled too. These cylinder heads were originally designed for various models of Chevy vehicles and are compatible with LM7, LR4, and LM4 5.3 engines. 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. The increased chamber volume of 6.5 cc's dropped the compression ratio by nearly 0.80 points. 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. 2007 Chevy trailblazer SS. A lot has been unveiled about 799 heads. 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. However, some cylinder heads come with an architecture that hinders the engines power output. In fact, this test will illustrate exactly why you can't translate flow figures into power production. 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. 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. However, it's important to note that porting is a delicate process. This can positively impact a vehicles engine performance and efficiency. The decks are thicker to withstand more boost. We had high hopes for the 317 heads, but they were definitely the low man on the performance totem pole. In fact, it is estimated that these heads can increase horsepower by up to 25 hp and boost total power output by 3-4%. The 799 cylinder head distinguishes the 5.3L from other engines due to the compression ratio. 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. 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. 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! If you are contemplating a porting job, choosing the 799 cylinder heads will be wise. Not knowing it is a vin(b) 5.3 l33ho. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. Spring life isnt a problem because trucks generally dont spend a lot of time at high rpm. They can be found for around $1,300 which is inexpensive for an aluminum block engine. Additionally, these heads were used in some Camaros and Pontiac GTOs as well. It plays a significant role in selecting suitable heads because it will ultimately determine the compression ratio. Its a fairly straight forward swap and Summit has the cam swap kits that include the gaskets, LS2 timing chain, and damper bolt. 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). The aluminum blocks have Siamese bores with sleeves that are bonded to the block, and other enhancements, making them durable for boosted power. Until we find that out, all hail the mighty 706 heads. 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. The port shape is identical to the 243-cylinder head. The VVT system needs to be eliminated for aftermarket cams. 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! The 799 is basically the successor to the 243 without any significant changes. For example, should you opt for theChevy 799 heads, or are the LS 243 cylinder heads better? An LS3 or LS9 cam makes good power, but not where you want it if youre using the L33 engine in a truck. Your email address will not be published. The trucks manufactured in 2005 and after, and newer models of 5.3L and 4.8L trucks had 799 heads. You can make 700+ hp with a couple of simple upgrades like head studs and LS9 head gaskets. 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. All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. I am looking at 5.3 with 862 heads to put in a 1950 fleetline. 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 L33 is basically a baby LS6 with a truck intake. It is an aluminum block. Usually found in GM trucks, the LS engines with 799 heads come in two sizes: 5.3L and 4.8L. ARPChevrolet PerformanceCustom Performance Racing (CPR), Gardena, CAWiseco Pistons, Custom Performance Racing (CPR), Gardena, CA. 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.
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