Ls7 block

Any bozo can slap a supercharger on a stock horsepower LS7 small-block and pick up another hp. Increasing output that same hp through natural aspiration should be harder, but all it takes is some head work, long-tubes, and a big hydraulic roller cam. Or so boring. Pass the Red Bull, please! On the flip side, in highly competitive racing classes that place strict limitations on engine modifications — like NHRA Stock Eliminator — scratching and clawing for that last percentile of hp separates the apex predators from the bottom-feeding rodents.

In this upper echelon of professional engine building, the cumulative effect of a bunch of little tricks — like minimizing ring drag, stabilizing the valvetrain, maximizing cylinder wall integrity, and experimenting with countless valve jobs — pumps up factory horsepower ratings to ridiculous levels.

The resulting numbers are absolutely astonishing: horsepower and 8, rpm with a hydraulic roller camshaft, factory Chevy cylinder head castings, and a production LS7 aluminum block.

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Although no Pro Stock or Sprint Cup team in their right mind would ever reveal trade secrets of this caliber, as an educational institution, SAM Tech was more than happy to divulge what it takes to build a race-winning Stock Eliminator LS7.

Cutting-edge projects like these serve as the perfect testbed for students and instructors to apply lessons learned in the classroom to real-world race engines. Beyond hp, the factory LS7 block is notorious for cracking, particularly in forced induction applications. Replacing the factory gray iron liners with Darton ductile iron sleeves virtually eliminates the possibility of cylinder wall distortion and cracking.

When honing a race engine, the goal is to have just enough surface area on the wall finish to seal the rings, since too much surface area can compromise oil retention. SAM Tech radiused the breathing notches in the block and the main caps to further improve bay-to-bay crankcase ventilation.

Removing casting flash from the crankcase eliminates stress risers and the potential for cracks to develop. Main bearings number 1 and 5 have been narrowed from.

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Since the number 2 and 4 main bearings endure the most abuse, and the number 3 bearing serves as the thrust bearing, SAM Tech left them at the stock width. The account for forging variations, the NHRA allows for an additional.


Not surprisingly, many racers now offset grind the Compstar LS7 cranks to 4. With a 4. Chevy just dreams these hp numbers up. Although the COPO motor shares the same block, bore diameter, and stroke dimensions as a production LS7, its rotating assembly is completely different. It features a Callies Compstar steel crankshaft, and forged 6. In addition to increasing the compression ratio more than two full points over stock, the pistons boast a Grafal anti-friction coating and low-tension rings.The LS based small-block engine is the primary V8 used in General Motors ' line of rear-wheel-drive cars and trucks.

Introduced in Januaryit is a "clean sheet" design with only rod bearings, lifters, and bore spacing in common with the longstanding Chevrolet small block V8 that preceded it as the basis for GM small-block V8s. The basic LS variations use cast iron blocks, while performance editions are all aluminium with cast iron cylinder liners. Variants of the LT version of the GM small-block have been used since. Most of the credit for this engine family must go to Ed Koerner, GM's Powertrain vice president of engineering operations at the time.

The performance improvements in the LS-family V8s over the previous classic small block V8 family are several. The lower section of the block incorporates deep side skirts, along with 6-bolt cross-bolted main bearing caps. This fully boxes the crankshaft, creating a very strong and rigid structure that has been hot-rodded by enthusiasts to over 1,HP.

Although it is the same compact physical size as the classic small block V8, this block can accept a 4-inch stroke as an option in its stock form, due to the cam location being elevated slightly, compared to previous block designs.

Also, the cam bearing journals are larger, to allow for a higher cam-lift profile than was previously possible. The stock aluminum heads can provide a high amount of air-flow, which previously could only be found in aftermarket race-performance heads. The aluminum heads also incorporate steam vents to prevent gas pockets from building up in critical areas, and this is vital in allowing the coolant to manage heat build-up for high-performance applications.

Such design features allow for a higher compression ratio with no fear of detonation. The thermostat has been located at a low position, which eliminates the possibility of a gas pocket preventing the thermostat from properly sensing the heat of the coolant. Previous generations incorporated a coolant passage through the intake manifold to warm the incoming fuel-air mixture in very cold climates.

However, modern fuel-injection techniques eliminate fuel atomization concerns under all conditions, so the LS family uses a dry intake manifold.

ls7 block

This removes a common coolant leakage point, and also allows the incoming air to remain as cool as possible for better power production. The architecture of the LS series makes for an extremely strong engine block with the aluminium engines being nearly as strong as the iron generation I and II engines. The LS engine also used coil-near-plug style ignition to replace the distributor setup of all previous small-block based engines. The cylinder firing order was changed toso that the LS series now corresponds to the firing pattern of other modern V8 engines for example the Ford Modular V8.

The first of the Generation IIIs, the LS1 was the progenitor of the new architecture design that would transform the entire V8 line and influence the last of the Big Blocks. The Generation III 5.

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The extra horsepower was claimed to come from the intake ram-air effect available in the SS and WS6 models. The LS6 shares its basic block architecture with the GM LS1 enginebut other changes were made to the design such as windows cast into the block between cylinders, improved main web strength and bay to bay breathing, an intake manifold and MAF-sensor with higher flow, a camshaft with higher lift and more duration, a higher compression ratio of The casting number, located on the top rear edge of the block, is The 4.

Catharines, Ontario and Romulus, Michigan. It uses flat top pistons. L59 denoted a flexible fuel version of the standard fuel LM7 engine. Vortec s are built in St. Another engine variant, the L33, shares the same displacement, but has an aluminum block with cast in cylinder liners, much like the LS1. It has a cast iron block and aluminum heads, and can be considered the "garden variety" version of the Generation III V8s. The L33 uses flat top pistons from the 4.

It also uses cylinder heads, which are identical to castings found on LS6s and LS2s, lacking only the Corvette spec valve springs and hollow stem exhaust valves on the LS6.Due to shipper and supplier delays, your order may take longer to arrive.

ls7 block

If you are an international customer who ships to a US address choose "United States delivery" and we will estimate your ship dates accordingly. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Image is a representation of this item. Actual item may vary. Change Currency. Engine Block, Aluminum, 4. Loading Today Estimated International Date Check Fit. Chevrolet Performance 7.

Brand: Chevrolet Performance. Manufacturer's Part Number: Part Type: Engines, Bare Blocks.

ls7 block

Product Line: Chevrolet Performance 7. Main Journal Type: LS mains. Deck Height in : 9. Cylinder Bore as Shipped: 4. Cylinder Bore Diameter: 4. Maximum Bore Diameter: 4. Engine Block Material: Aluminum. Main Caps Included: Yes. Main Cap Material: Nodular iron. Main Cap Fasteners Included: Yes. Main Bearings Included: No. Rear Main Seal Style: 1-piece. Finished Cylinder Bores: No. Raised Cam Location: No. Cam Bearings Included: No.

Freeze Plugs Included: No. Quantity: Sold individually. Tool Stroker Combinations. These Chevrolet Performance 7. They are manufactured from T5 aluminum alloy with pressed-in sleeves, a production oiling system, and 6-bolt dowel-located steel main bearing caps. The Chevrolet Performance 7. Siamesed cylinder bores eliminate any heat issues and allow for larger bore diameters.JavaScript seems to be disabled in your browser. You must have JavaScript enabled in your browser to utilize the functionality of this website.

Be the first to review this product. By far the most established member in the LS engine family, the LS7, has proven time and time again to be the prime choice of late model hot rodders worldwide. Send us your GM factory cores and allow us to sculpt our proven port configuration and build you a set-up that will dominate any street or track you choose to bo battle on.

Get going faster even faster with the LME core exchange program! Standard Core Exchange - We will swap out your useable cylinder heads with a freshly ported and prepaired set once we recieve them via your prefered shipping method or drop-off. Therefore, you will not be charged for the core exchange. Expedited Core Exchange - We will ship you a set of CNC ported heads fresh out of the machine and set up to your cam specs once the order is placed.

Once your usable cores have made their way to us, LME will refund the cost of the cores. We will cover any details and clearify any question or concerns you may have. We will also seek out all possible information of the build to better provide the best service and parts for your project. This expedited service allows you or your installation shop to have all the parts in hand to complete a CNC ported head install without the down time and hassle of waiting on ported heads to arrive.

Exclusions apply. Get Details. By specifying your cam lift LME will assemble your cylinder heads with the proper spring installed height. This will result in optimal spring pressures and coil bind distance for maximum performance. Please include rocker ratio to ensure acuracy. Clean carbon from intake exhaust and chambers used cores. Valve guide clearance measured and adjusted for application.

Combustion chambers measured and adjusted for application. Meticulous final cleaning of cylinder head and components.We know, advertisements are annoying and slow down the internet. Unfortunately, this is how we pay the bills and our authors. We would love for you to enjoy our content, we've worked hard on providing it. Please whitelist our site in your adblocker, refresh the page, and enjoy! The 7. The LS7 is also one of the most powerful naturally-aspirated engines in the world.

The LS7 is easily identified under the hood by red engine covers with black lettering. It also uses a racing-style dry-sump oiling system that helps ensure adequate oil pressure during high-load cornering.

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The ,square-foot facility weaves the best practices of low-volume niche manufacturers and the established quality and manufacturing standards at GM to ensure the highest-quality specialized engines. Follow our coverage of GM LS7 engine news.

Inside Secrets: SAM Tech’s 825 hp Stock Eliminator LS7

The LS7 uses unique pressed-in cast iron cylinder liners to accommodate the largest cylinders bores in the engine family. The LS7 block also features very durable, doweled-in, forged-steel main bearing caps, which hold the balanced, forged-steel crankshaft in place and reduce crank flex.

Its deep-skirt design helps maximize strength and minimize vibration. A structural oil pan further stiffens the powertrain. Deck Plate Honing : a precision machining process typically reserved for high-performance engines is used on the LS7 cylinder block to maximize engine life, reduce friction between engine parts, and increase horsepower. It is advantageous in applications where cylinder head pressures are greater than average — such as with a supercharged engine — to ensure cylinder sealing and prevent scuffing of the piston against the bore wall.

In the LS7 engine, this means improved bore life and ring sealing. True bores and better sealing are keys to optimizing power.

Titanium Connecting Rods : lightweight titanium connecting rods are used in the LS7 to reduce the pressure on the rod end bearings and the main bearings, and allow the bearings to be optimally sized for the least amount of friction. The lightweight rods are matched with pistons that feature tapered wrist pins to reduce weight. The piston rings are anodized to reduce blow-by and friction, while the skirts are coated with a polymer material to limit bore scuffing and reduce noise.

To that end, the LS7 is fitted with high-flow cylinder heads that are derived from racing heads first proven on the track with the Corvette Racing team.

The composite manifold is manufactured with a lost core process to improve runner-to-runner variation and to reduce flow losses. Advanced Electronic Throttle Control : with ETC, there is no mechanical link between the accelerator pedal and the throttle body.

A sensor at the pedal measures pedal angle and sends a signal to the engine control module ECMwhich in turn directs an electric motor to open the throttle at the appropriate rate and angle. The ETC system can deliver outstanding throttle response and greater reliability than a mechanical connection. Engine starting is also more consistent in all operating conditions. Hydroformed Exhaust Manifolds : the exhaust manifolds are made of hydroformed stainless steel, which is lighter than cast iron, and feature a unique four-into-one collector designed to maximize airflow.

Exhaust pipes on the LS7-equipped Corvette Z06 are three inches in diameter, compared to the 2. GM Authority Newsletter Subscribe for free to receive our daily newsletter in your inbox.

First Name. Last Name.This build features higher quality parts from the ground up at a more reasonable cost. Some of this engines main features include a new aluminum LS7 Series 6 bolt block, completely forged bottom end, custom ground hydraulic roller camshaft, performance cylinder heads, full trunnion rocker arms and a muscle car oil pan designed to fit almost every application. We can also assist you in picking out the correct motor mount and header combination that will fit your hot rod, as well as a complete serpentine pulley kit and transmission.

All of the Proformance Unlimited turn-key LS engine packages will include an engine harness and an ECM to allow for full engine control and the best driving characteristics possible. All of our turn-key engine packages will allow your engine to run and function exactly like a new car straight off of the production line!

This will not only help the power output, but it will also help to maximize the fuel mileage!

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However, we do offer upgrades for all of these items, which are listed above in the drop-down menus. Let us know if you are looking for an item that is not listed, and we will be glad to provide you with a price!

The aluminum coil pack relocation kit allows you to hide the ignition coil packs anywhere you would like under the hood, which provides you with a clean and uncluttered engine bay. All Proformance Unlimited turn-key engine packages will come standard with a one-year, unlimited-mile warranty as standard!

This will require all tuning to be performed by us. We stand behind our work, and when you purchase a Proformance Unlimited engine you are not only buying the parts but also the knowledge, experience, and know-how! We know what works and what is required to complete the installation!

GM 7.0 Liter V8 LS7 Engine

Facebook Twitter. Request More Information. Follow Follow Follow Follow.The team collected 45 wins in 66 starts-a win ratio of about 70 percent. It will certainly go down in history as the most auspicious racing program in the Corvette's history. Much of the credit for those continuous wins can be ascribed to the fortitude of the powerful C5-R 7. It was also designed as a structural member of the Corvette C5-R race car's chassis.

Weekend racers and street enthusiasts rejoiced-and winced.

GM LS7 CNC Ported Heads

That's just the cylinder case, mind you-not a whole engine. Granted, for the money, one receives a race-prepped block with some serious hardware. To date, about C5-R blocks have been purchased outside of the Corvette racing program. Like the C5-R, the LS7 block is an aluminum block that enables the construction of a ci engine.

The LS7's production manufacturing, however, means it costs substantially less than the C5-R block. This is huge. The High Cost of Racing Invariably, the question is begged The LS7 block's rear bulkhead has a cast-in reminder of its intended displacement.

Admittedly, those are performance parameters most private enthusiasts won't push-making the LS7 look even more like a value. One of the caveats of jumping onto the LS7 bandwagon is the current absence of an over-the-counter controller from GM for the engine.

But just as engine builders have adapted stand-alone systems for their C5-R-based engines, so too will they find a workaround for LS7-based buildups. Gen IV engines have a front sensor mounted in the timing cover. Production differences include details such as varied external ribbing-the C5-R has increased ribbing because the engine was designed as a structural member of the race-car chassis-and conventional LS7 versus screw-in C5-R galley plugs. The major differences are the ones that account for much of the price disparity between the two blocks.

To begin, the C5-R block is cast with a very specific recipe of M aluminum.

ls7 block

Once cast, it is heat-treated and hipped. Hipping, a reference to hot isostatic pressure, is a procedure in which the block undergoes a multistep treating process that pressurizes, heats, and cools it to ensure strength and all but eliminate porosity. Approximately 20 percent of the C5-R block castings that undergo this expensive several hundred dollars per block and time-consuming process are rejected.

The production LS7 block doesn't receive this treatment, but it also wasn't designed for professional endurance. Both the LS7 and C5-R blocks receive precise machining and leak testing, but the C5-R block features align-honed camshaft and crankshaft journals.

The align-honed cam journals ensure the camshaft and crankshaft are squared up, which is essential to engine life under extreme racing conditions. The main caps are also significantly different between the blocks.

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