Ultimate LS Cathedral Port Cylinder Heads Guide. Cathedral port cylinder heads have been mistakenly dismissed by many in LS series circles for being old tech. However, their thin cross section allows for a high velocity and smaller volume runner design with excellent flow. For a street car, this design means excellent throttle response, torque and average power. Offers superchargers, turbos, nitrous oxide and stroker engines. I just bought HP Tuners software. Waiting for everything to arrive. What was changed in this version of the base tune in the file ISUPAGE Isuzu Automotive Performance Tuning Page. The oldest known and most comprehensive source of information on performance tuning, hotrodding, modifying, and. This Tech Tip is From the Full Book, HIGH PERFORMANCE GM LS SERIES CYLINDER HEAD GUIDE. For a comprehensive guide on this entire subject you can visit this link SHARE THIS ARTICLE Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. You can copy and paste this link to share https lsenginediy. Dyno tests have proven that comparable aftermarket cathedral port heads can match a rectangular port in peak power, while proving much more impressive below the curve. For road racing, a cathedral port is ideal, and has even proven to be quite capable in drag racing with an altered valve angle and larger runner sizes. Factory Heads. LS1. This twin turbo 7. L LSXswapped Camaro SS it hitting the rollers. This bad mutha lays down 891RWHP, along with the fireworks. Your Source For LSX Conversion Parts. PSI specializes in the design and manufacture of GM Standalone Wiring Harnesses for LT1 and LS Engines and Transmissions. C5 C6 C7 Corvette performance parts dyno tuning experts. LSX LT1 LT4 Corvette engine dyno tuning, road racing and performance packages. Specializing in the GM LS series of engines. LS1, LS2, LS3, LS6, LS7, LSX, Ecotec, Alloytec, Direct injection, LS engine building, LS Racing engines, Turbocharged LS. PCM Tuning Process Flow. DISABLE ALL TORQUE MANAGEMENT This will eliminate all torque management within the PCM. Ignore this step for a standard transmission. FAST is the leading developer of electronic fuel injection systems, EFI components, intake manifolds, tuning tools for high performance and street applications. Thank you to all of our customers. Ken and Dave have really enjoyed creating the tuning tools you asked for. We are running low on cables these days, and Ken and. Ls1 Tuning Software' title='Ls1 Tuning Software' />The OEM design that started it all, the original Gen III cylinder head, helped produce 3. There are changes throughout the model years, which are indicated with various casting numbers last three digits are the part number. The later 2. 41 castings featured lighter valves, a more common center valve cover bolt configuration, and several other nuances that make them more desirable than the 8. Though no longer produced by GM, all versions are fairly abundant used and work with any factory or larger bore. If you are new to Gen IIIs, please note that these heads are aluminum and unless otherwise noted, so is every other head in this book. LR4LM4LM7. Following directly in the engineering footprint of the LS1 casting, these cylinder heads were used on the 4. The only differences between these heads and the LS1, besides the price, are the valve size and combustion chamber. Out of the box, the small valves make these heads a poor choice for performance applications, but these components are easily upgradable, which often makes for a great high compression head that is easy on the wallet. These heads have been phased out of production in favor of higher flowing, LS6 based castings. Mafia 2 Playboy Rar. However, they are quite plentiful used and work with any bore size search for casting numbers 8. LQ4. These heads came on low performance 6. The early design was the only castiron LS head ever made, and the least desirable in a performance application. However, the later heads can be a good choice for boosted applications because they offer larger runners and combustion chambers for lower compression over the factory LS1 heads. Because these heads are no longer in production, they must be purchased used. Though they are not the most common, they are also not the most desirable, so the price tag is usually very reasonable and work with any bore size. LQ9. The hipo 6. 0 liter truck engines, such as the Cadillac Escalade, received this variation on the LS6 head. Though the runners are identical to those on the LS6, its combustion chambers are larger, just like the LQ4. This combination of optimal runner design and larger chambers makes the 0. OEMs for boost. These heads are no longer in production, replaced on 6. L9. 2 head, but used castings are not uncommon or unreasonably expensive. Because of the small valves, these heads fit on small bore applications though the large chambers may be a bit much. LS6LS2. In its most potent form, these heads supported a conservatively rated 4. Z0. 6 Corvette. The LS6 was designed specifically by GM to surpass the LS1 as the best performance head, and it did such a good job that the 2. LS2. Aside from the LQ9, which is a copy of the LS6, these are the best performing of the OEM cathedral ports. Though the LS6 and LS2 are no longer in production, brand new bare castings are still available for around 8. Chevrolet Performance Parts dealers. In production these heads have been repurposed on the aluminum 5. L truck engine L3. L blocks 3. 7. 8 inch bore, and are quite abundant used. Aftermarket Heads. Although Chevrolet has invested plenty of time and effort into engineering a fine array of cylinder heads for the LS Series engines, it still must focus on the needs of the massmarket consumer. Aftermarket companies have no such restrictions, and can craft performance specific castings to meet the needs of racers and hardcore enthusiasts. Some of them are custom porting jobs based on existing factory castings, while others are completely custom castings. This means an incredibly broad range of port sizes, chamber depths, and valve options exist for the discerning LS head shopper. Whether youre designing an engine from the ground up or updating an existing powerplant, the odds are strong youll be able to find a head that suits your needs whether youre drag racing, road racing, or off roading. If you need to feed a big inch stroker LS or are adding forced induction, a well engineered head that can aid your quest for power almost certainly exists. On the following pages youll find the pertinent information and dimensions for just about every commercially available aftermarket cylinder head. Please note that the flow numbers have been provided by the manufacturers, and may not be perfectly comparable because they were acquired on different equipment. Still, they should be close enough to serve your needs when looking for a particular flow range. Advanced Induction. Includes GM 7. 068. Liter LS1, 2. 18 cc. GM 2. 43 LS6 and 7. LS2, 2. 18 cc. GM 2. LS6 and 7. 99 LS2, 2. While not the largest name in the industry, AI is well respected. This North Carolinabased shop is practically a factory for CNC head porting, with programs for the Gen II, III, and IV small block only. Specializing in such a finite area makes AI particularly knowledgable, precise, and efficient. Each program is well thought out to appeal to a particular and common customer need. At the time of publication, AI had just completed several new heads with aftermarket and factory castings. It also offers intake manifold porting and valvetrain kits with a specially designed camshaft. Advanced Induction. GM 7. 068. 62 5. Liter LS1, 2. Advanced Induction AI takes the GM 7. Manley Racemaster stainless steel valves, suitable for a 3. These heads boast plenty of piston to valve clearance for an 1. LS1 with a large duration cam without cutting piston reliefs, though cutting the chambers can easily put compression over 1. AI claims this reasonably priced offering is easily capable of 4. A similar program for the 2. The machining and labor costs alone are 1,1. The buyer must supply a core. Because stock valves are used, there is no limitation on bore size. Advanced Induction. GM 2. 43 LS6 and 7. LS2, 2. 18 cc. The 2. Bd-Company Rapidshare Torrent. LS6LS2 head is a mild upgrade from the basic performance rebuild, which boosts flow by 3. That is not to say, of course, that the 2. AIs other heads CNC ported runners, PCD milled deck, flanges, and valve cover rail. AI claims these heads are worth 2. The base machining and labor cost is 7. Airport Firefighter Simulator Cracked on this page. Additional charges apply for various components and options. The stock valves allow for any bore size. Advanced Induction. GM 2. 43 LS6 and 7. LS2, 2. 26 cc. AIs flagship cathedral port increases the port volume by 1. GM valves reground. Despite the larger runners, AI claims these heads produce great power under the curve, crisp throttle response, and no loss in driveability. Harland Sharp, GM LS16 Aluminum Roller Rockers, Chev, 1. Ratio. Harland Sharp GM LS16 Aluminum Roller Rockers. Fits 1. 99. 7 to 2. GM LS16 and GM LS24. Designed to be a replacement for factory rockers and fit under the stock valve covers. These non adjustable rockers are designed to factory specs. Simply remove the factory rockers and rocker stands and replace with your new Harland Sharp roller rockers. Part Type Rocker Arms. Application ChevroletGM LS16  Rocker Arm Material Aluminum. Rocker Arm Style Roller Tip Rocker Arm Ratio 1. Self Aligning No. Rocker Arm Mounting Style Pedestal. Stud Size NARoller Tip Yes Roller Trunnion Body Yes. Rocker Arm Nut Included Polylock. Rocker Pivot Balls Included No. Rocker Arm Finish Orange Anodized. Maximum Spring Diameter 1. Shims Included No. Manufacturer Harland Sharp. Manufacturers Part Number SLS1. Weight 7. 0 lbs.  Warranty All Harland Sharp rocker arms carry a Lifetime Guarantee against manufacturing defects. If any machine work is done to alter the product from its original manufactured state all guarantees against defects and materials will be void. Quantity Sold in Sets of 1.