This powerful engine (part No. These 799 heads are the latest model and are made using the semi-permanent mold method. are some of the most popular heads used in LS engines. Therefore, regardless of which head you choose, you will still receive maximum power from your engine. 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. Should Copper Spray Be Used on a Head Gasket? 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. 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. It is the Lt model and the 8th character of the VIN is 7. Its been known to handle over 1,000 whp. 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. Car Wobbles at a Very Low Speed (Causes and Fixes). Since LS and Vortec engines are so common, theyve become the go-to performance and swap engines of the modern era. These heads are for a new project that will be beginning soon on the channel, more on that soon! Or they had them in stock at the factory and used them till they were gone! 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. lift and extend the rpm range. Will the stock ECU be able to be programmed for the manual? making 310hp (235kW). However, ensure to consider the pros and cons of swapping your current cylinder heads to 799 heads before a porting job. The LC9 was the last of the LS base truck 5.3s any 5.3 for a truck after the LC9 is a newer version Of the old LS called LT with direct injection. If you are looking for 799 LS heads,Allied Motor Partsis the best place to get them. 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. Until we find that out, all hail the mighty 706 heads. If so, what would you recommend? They come with smaller chambers compared to some of their counterparts with rectangular ports. This was due to higher flowing Cathedral port heads, more compression, and a slightly bigger cam. The Vortec 5300 engine had several variants over its life, being known as the LM4, LM7, L33 and L59. Would this change with the presence of boost? In 2014, the L83, the LT version of the 5.3L, appeared with direct injection, taking the engine in a totally different direction. It is an aluminum block 5.3 with either 706 or 862 heads, NON DOD. This specific guide is for the GM LC9 5.3L engine. First, you want to avoid the Gen III heads with the "battery" castingthey are crack prone. The cylinder heads intake port and exhaust port shapes are cathedral and D-port, respectively. The 799 head flow supersedes that of 706 heads with as much as about 20 cfm at specific lift points. Swapping a L33 into a 96 Silverado with a fresh NV3500. The 799 Cylinder Head has an exhaust valve size of 1.55 inches and an intake valve size of 2 inches which are both slightly larger than many other commonly used cylinder heads on the market today, allowing for better airflow into your engine without sacrificing performance or reliability. 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. The LC9 engines also came with 799/243 heads. The aluminum 5.3-liter truck engine has 799 heads. 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! 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. Both the 243 and the 799 cylinder heads are General Motors 3rd generation cylinder heads designed for V8 trucks, performance engines, and SUVs. The question now is where that limit occurs. Come join the discussion about Silverados, Sierras, and other full size trucks . This engine WILL be supercharged so the LQ9 looks best but so much harder to find trying to do research on supercharging a L92 is hard to find info on. However, it's important to note that porting is a delicate process. 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. It plays a significant role in selecting suitable heads because it will ultimately determine the compression ratio. Condition: Remanufactured - Exceeds OEM Specifications. For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. Still can drive daily. 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. Since inception, the 799 heads have offered superior performance and efficiency on the 4.8 and 5.3-liter truck engines. The exhaust port volume specifies the total amount of exhaust gas that can flow out of the cylinders during the exhaust stroke. im looking into getting 600whp will the stock heads get me this with a 80mm turbo? Typically, the D-shaped port helps increase the flow of exhaust gases. With this new technology came increased efficiency and drivability as well, all making for one of the most desirable engines ever created by GM. have an aluminum build that can withstand high temperatures. While the 243 heads were initially made for C5 Corvettes from 2001 to 2006, their popularity among LS6 engine users soon expanded beyond this. 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. This top-of-the-line cylinder head assembly offers increased performance without sacrificing reliability or durability, making it an ideal choice for any hot rodder or drag racer looking to up their game. At best, flow numbers indicate potential power, but we are getting ahead of ourselves. The head is designed for use with four cylinders but can be adapted for use with up to 6 cylinders if necessary. The size of the combustion chamber is the major challenge with swapping to 799 heads. Air raid intake filter. Crafted from aluminum with a 61cc combustion chamber volume, these cylinder heads feature a cathedral-shaped intake port and an oval exhaust port. Other options to maintain or increase pump pressure includeelectronic voltage controllers and hotwire kits. It still has the same 24X reluctor ring, cam sensor location, knock sensor location etc. Check out the graphs for a full rundown, but the big surprise was that the amazing power of the legendary 799 (243) heads never materialized. I am looking at 5.3 with 862 heads to put in a 1950 fleetline. This will definitely free up a few horsepower and gives the little engine a big personality. 13 Step Process for Remanufacturing Cylinder Heads, Cylinder Heads for the Chevrolet 350 - What You Need to Know. The intake port forms the final part of the air induction system in an engine. Engine specialists have taken these powerful components and remanufactured them at more budget-friendly prices. The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. Furthermore, even if you do decide to switch out the heads, there would still be no difference in horsepower output. link to Alternator Overcharging - Causes and Fixes, link to LS Head Bolt Torque Specs and Sequence. It is responsible for removing the spent gases from the cylinders. But most other engines with 5.3L (HO) or 4.8L feature 799 heads, especially those made after the mid-00s. Year Range: 97-04. While large combustion chamber reduces the compression ratio, smaller combustion chamber produces more power due to increased compression ratio. This record is an incredible milestone in the motor racing industry, and it truly showcases Capizzi's talents as an expert driver and racer. However, Chevy unveiled the L20 4.8-liter engine, which had the 799 cylinder head in 2010. [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. Description: CNC Ported LS1/LS6 243/799 Cyl Heads .650 Springs 2.02/1.59 Valves PAIR. The cylinder cast architecture is with a semi-permanent mold method. 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. Scroungers are known to CNC port the 862/706 heads to get them to outflow the more expensive Gen IV 243/799 head. This might be another good indicator on how well they work on the small-bore 5.3L. Welcome to rxmechanic.com. 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. when the piston is at the bottom dead center (BDC) and to the volume when the piston is at the top dead center (TDC). However, if you're planning to drive in hot weather or at high altitudes, you'll need an engine that can handle harsh conditions. 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. Where Are Head Gaskets Located on an Engine? However, you may also find some heads made from cast iron. However, when it comes to performance, both cylinder heads are interchangeable and will provide the same power output. Yes I had a 2013 Sierra sle as well with the lc9 13 is the last year till the swapped over body styles. Apparently the LC9 was manufactured until at least 2013. It is going to face "all the boost," which means 35 or more pounds making 1,000 lb-ft to the tires. This means that it has plenty of power to tackle any job you can throw at it, whether youre commuting on the highway or taking your truck off-roading for some fun in the mud. Given the minimal difference in flow and lack of power production, the 241s don't seem like much of an upgrade over the 706 heads. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. The 799 is basically the successor to the 243 without any significant changes. Finally, you'll want to take the compression ratio into account. 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 engine specs and information listed here is for a stock LC9 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. If you plan on running a power adder or have a long list of upgrades planned, its recommended that you take your truck to a chassis dyno tuner who can give you a custom tune. There is one major challenge when it comes to swapping to 799 heads the size of the combustion chamber. Youve likely upgraded the fuel system and injectors if youre looking at power adders. 799 heads on 5.3 engines are a perfect fit. This is the test everyone wanted to see, and the one every LS owner will be talking about. The injectors are only 25 lbs. Valve Size: Intake - 1.89, Exhaust - 1.55, Port Volume: Intake - 197 cc, Exhaust - 69 cc, Chamber Diameter (distance across): 3.756, Valve Size: Intake - 2.00, Exhaust - 1.55, Port Volume: Intake - 199 cc, Exhaust - 71 cc, Chamber Diameter (distance across): 3.821, Port Volume: Intake - 212 cc, Exhaust - 76 cc, Chamber Diameter (distance across): 3.923, Port Volume: Intake - 209 cc, Exhaust - 74 cc, Chamber Diameter (distance across): 3.876. 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 larger chambers make the 317s popular for boosted applications, but know you are starting with a significant deficit by replacing the 706 heads with the 317s. [] LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More []. 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. For example, should you opt for the. 4X4 . Overinflated Tire by 5 Psi: What Will Happen? 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. This put it within 2.5 cc's of the 706, meaning there was only a minor change in static compression between the two. . It was found that the 799 heads were superior, offering as much as 20 cfm more than the 706 head at some lift points. This also helps reduce emissions by allowing more complete fuel combustion in each cylinder. Which Motor would be a good replacement drop in with parts being used from old engine? The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. For a primer on the entire LS engine universe, readLS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family.]. Hunter, the BTR Stage 3 truck cam is nice. They are built with sophisticated architecture, including a cathedral-shaped port with smaller combustion chambers. 280k miles. . Bore 2/4 = 2.326 in. The 0.600-inch lift, or possibly the 0.650, numbers were more relevant, but the 799 heads still shined here with flow readings of 248 cfm and 249 cfm, respectively. Manufacturer: Chevrolet. If he is not in the garage fixing challenging mechanical problems, he is writing automotive repair guides, buyers guides, and car and tools comparisons. If youre going over 800 hp, a set of .200 in. 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. These 799 heads are the latest model and are made using the semi-permanent mold method. Brian I have a 06 L33 4wd Silverado I am wanting to build it up a bit. . 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. 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? You will need re-route the EVAP line and may have to extend the MAP sensor harness. The chamber volume on the 799 heads was within 2.5 cc's of the 706 heads, but the. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. 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. The 799 heads have a smaller combustion chamber of 64cc, which significantly increases the compression ratio. Big 7/16-inch rod bolts will go a long way to keep things together over 7,000 rpm. 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 intake port volume for 799 LS heads is 209 cc. Therefore, the size of the exhaust valve is an essential factor in determining how much power an engine can generate. Its a fairly straight forward swap and Summit has the cam swap kits that include the gaskets, LS2 timing chain, and damper bolt. I PUT A STAGE 1 TSP TRUCK CAM WITH AIR RAID INTAKE AND DYNOED 283WHP AND 302WTQ. Is this an error on your statement of facts about the specific vehicles it was in or do I have something special? Many ported 799 heads are made from aluminum, which is a good choice because it's both solid and lightweight. Not only did Capizzi stun the world on Thursday when he set a new stock bottom end (SBE) record for LS Engines with his extraordinary 4.506 @ 155.70 pass during testing for the race, but he also amazed everyone present with his exemplary feat. Which came out in the 2014 model years. 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. All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. I have a 2012 silverado 1500 crew cab. The799 LS headsare some of the most popular heads used in LS engines. There is a .550 lift version of the SUM-8712 coming soon called the SUM-8719. The size of the valves affects the performance of an engine. The peak numbers were certainly close (473 hp vs. 471 hp), but the graph tells the story best. The exhaust port features a D-port shape that reduces back pressure while still providing plenty of exhaust flow for increased horsepower and torque output. While it may not seem like much, the stock 5.3L engine is quite a powerhouse. 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. It also boasts a high thermal conductivity rate which helps keep temperatures low during operation. The cylinder heads are designed to offer increased horsepower due to the increased compression which results from the smaller combustion chamber. Aftermarket heads reduce downtime and are cost-effective when you sell your old heads in good condition. 799 Heads: All About 799 LS Heads & Their Application. 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. The LS engines with 799 heads are 5.3L and 4.8L. The first thing you'll want to consider is the engine displacement, also known as cc. Go there and search LS engines for a comprehensive collection of LS engine tech information.). The #799 cylinder heads are reportedly the same casting as the LS6 and LS2 #243 heads, minus hollow exhaust valves and high-performance valve springs. The 799 LS heads have a D-shaped port. A test of the popular factory cylinder heads has been a long time coming, and honestly, we are not sure why it hasn't been done before. The 799 Cylinder Head is made from lightweight aluminum that helps reduce weight while still providing superior strength. I like the sum-8712 cam idea, but my issue might be keeping it under the hood. You also need to consider the type of vehicle you have. Drop-in .500-in. Despite having been out of production since 2006, this engine remains popular amongst performance enthusiasts due to its strong performance capabilities even without modifications. The main reason for going with a stroker forged crank is for the added cubic inches. Spring life isnt a problem because trucks generally dont spend a lot of time at high rpm. Youre making more power than that.. Wind her out to 7k rpm with that intake for an accurate hp/tq figure. The 799 LS heads have 2.00-inch intake valve. The factory fuel pump will become a limitation around 430 whp, so you should plan on upgrading thefuel pumpas well. 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). In fact, this test will illustrate exactly why you can't translate flow figures into power production. I have a 2013 Chevy Silverado 1500. Bore 1/5 = 2.346 in. Not surprisingly, the 706 truck heads offered both the smallest port and chamber volumes. Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. You will sometimes hear the Vortec engine referred to as LS because the basic engine design is the same. 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. 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. Looking for 400+ hp at the wheels naturally aspirated? 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. 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! The material of the cylinder heads is another essential feature. I'd probably be incline to limit the chamber size to 61cc or 62cc. If it's not done correctly, it can decrease performance. They also had larger 2.00 intake valves than the Gen III. The 243/799 heads came on the 5.3 "L33 HO" motor in 05. If you are going through the heads, its recommended to switch to the light hollow-stem intake valves from an LS3. You will need to replace the cam, timing chain, and timing cover to get it all to work. Not really an expert, Your email address will not be published. These heads are said to be basically the same as the 243 head everyone gets a boner for. What heads came on LS3? 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. Note that a reliable channel will eventually guarantee a perfect compression. 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. Beyond that, .575 to .600 in. 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. Keep the above-mentioned points in mind when choosing the right cylinder heads. Are the 799 heads on LS1 interchangeable? 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. Main studs should be added any time youre this deep in the engine. 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. Im also thinking of 102mm intake manifold. The block is 80 pounds lighter than the iron version. The cylinder heads come with a smaller combustion chamber, which in turn engenders increased compression and improved horsepower. They can be cut to 2.000-inch to fit the standard valve seats and extend the rpm range up to 7,000 rpm. The 317 heads are often used on turbo small-block 5.3L builds, but the lack of compression really takes its toll on power. 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. A higher compression ratio means more power with less fuel in the cylinder and fewer exhaust gases. You'll also want to consider how often you drive and what kind of conditions you'll be driving. The test engine was an easy choice, as the 5.3L was the go-to engine, especially for the power-adder crowd. In-tank fuel pumps and external pumps are popular, but mild fabrication will be required. Usually about 7.425, but we recommend the use of a length checker before ordering just in case. [] L33 5.3L Engine Upgrade Guide: Expert Advice for L33 Mods to Maximize Performance []. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. Roughly in 2003, GM upgraded the LS into its Gen IV configuration with a number of changes. This translated into a drop in static compression of 1.2 points (from 9.5:1 to 8.3:1). The main difference between the two is from which mold casting the two cylinder heads originally came. LS engine spec guides and LS-relatedinformationhere. They can handle about 750+ hp and 7,000 rpm in boosted applications (at least for a while). 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. 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. The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. After a stint in the U.S. Air Force, Brian Nutter studied at the Houston, TX-based School of Automotive Machinists in 1997. 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 L20 4.8-liter engine had an A on the VIN. It is an aluminum block. The combustion chambers on the 706 heads measured 61.5 cc, while the intake and exhaust port volumes checked in at 197 cc and 69 cc, respectively. The exhaust flow offered by the 241 heads topped the other three heads tested here, but we suspect there would be variations among the different castings with different valve jobs and mileage. 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. This offers drivers an extra boost of performance without having to make any major modifications or upgrades to the engine itself, meaning you can experience improved acceleration and better fuel economy right away! CNC Ported 862 LS Heads- The Ultimate New Gen Cylinder Heads The CNC Ported 862 LS Heads are the most demanding cylinder heads in the modern era. 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 . 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. If you're looking for a high-performance upgrade to your Chevy engine, then the LS 706 Heads are the perfect choice. The best way to identify a 5.3L is the dish in the piston; the 4.8 has a flattop. lift cams are popular, but LS6 springs allow you to run .550-in. While a smaller combustion chamber increases the compression ratio, the bigger one reduces the compression ratio. The only difference is that they utilize a heavier solid stem intake valve. Want to dress engine up. The peak flow numbers differed by just 7 cfm at 0.700 lift. We loooove V8 Sky/Solstice swaps. The smaller combustion chambers help to reduce the compression ratio, which in turn boosts combustion efficiency for increased power output. 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. This is revealed in the 799 head specs outlined above. Heads and intake good for another 50+ hp. That will require fairly high octane. 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. 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). oversize forged pistons. The amazing success of this design is evident in the fact that its casting number, 243, was recycled for use on the LS2. 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?
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799 heads came on what motor 2023