Dec 04

Tech Tuesday: LSX 376 Crate Motor Ready For Boost

Big horsepower means big, beefy technology, and no one is better at providing a base for big horsepower than GM. Their performance division has come up with a new Bowtie Block in the form of an LSX 376ci that is ready for boost. Lots of boost. GM claims that the all-forged rotating assembly is ready for 1000hp and about 15psi.

The engine is based on the LS7 but with some extra metal left in key parts such as the cylinder bores and deck. This means the engine is ready to be bored out to 454ci. That will get the job done. The block has been accommodated for a six bolt head just in case you need to strap on a turbo or blower… you know,  if 1000hp just isn’t enough for you. All the other provisions are set up for stock LS series accessories in case you want to run those.

You can hit the jump for the full press release.

ORLANDO, Fla. – A revised version of Chevrolet Performance’s LSX™ Bowtie cylinder block is the foundation for new, boost-capable LSX376 crate engines designed to support up to 1,000 horsepower. The new LSX376-B15 crate engine features a durable, all-forged rotating assembly that supports engines making up to 15 pounds of boost – or up to about 1,000 horses. A more economical version – LSX376-B8 – is rated for eight pounds of boost and is designed for lower-output combinations.

The LSX Bowtie engine block is the latest design from the Chevrolet Performance engineering team. This durable iron-block casting is based primarily on GM’s production LS7 block, but it is designed with more material in critical areas – including a thicker deck and cylinder bores – to support displacement of 454 cubic inches or more. Unique six-bolt cylinder head provisions provide clamping capability for power-adder combinations greater than 1,000 horsepower. Although designed with racing in mind, each LSX block is machined to stock LS dimensions to accept stock LS components as well.

“We have continually improved the LSX Bowtie block to make the best foundation for high-performance LS engine builds,” said Jim Campbell, GM U.S. vice president of Performance Vehicles and Motorsports. “The new LSX376 boost-capable crate engines take it to the next level, delivering strength and capability in an assembled base that only requires the builder to add the power adder of his or her choice.”

The LSX Bowtie block casting is made of 400mPa tensile-strength iron, for great overall strength, and the casting is available in four versions:

Standard deck, semi-finished – part number 19260093
Tall deck, semi-finished – part number 19260100
Standard deck, finished block (4.065-inch bores) – part number 19260095
Standard deck, finished block (4.185-inch bores) – part number 19260099

Additional LSX Bowtie block features include:

LSX specific six-bolts-per-cylinder head bolt pattern
Accommodates all LS-series oil pans and oil pumps
Billet-steel six-bolt dowel-located main bearing caps
Accommodates wet-sump or dry-sump oiling systems
Extra-thick deck for maximum clamping force
Maintains production exterior accessory mounting provisions
Extra-thick cylinder walls allow increased bore capacity
Maximum 4.200-inch bore still allows 0.200-inch minimum wall thickness
True priority main oiling system
Main web bay-to-bay breathing holes reduce crank windage
Orange powder coat finish
Machined bore at 3.880 is ready for final boring/honing.

The LSX bare blocks and the new LSX376 crate engines are available from the new 2013 Chevrolet Performance catalog, which is available from Chevrolet Performance retailers or online at www.chevroletperformance.com.

Crate engine details

Built for boost is the best way to describe Chevrolet Performance’s new LSX376-B15 (part number 19299306) and LSX376-B8 (part number 19171049) crate engines. Each is engineered to provide a durable, ready-assembled foundation onto which the builder can finish with the forced-induction system of his or her choice.

For the all-new LSX376-B15, Chevrolet Performance engineers started with the LSX Bowtie standard-deck block, added a forged steel crankshaft, forged H-beam rods and forged aluminum pistons (9.0:1 compression), then topped off the short-block assembly with high-flow, rectangular-port, six-bolt LSX-LS3 heads for supercharged and turbocharged combinations producing up to 15 pounds of boost and up to about 1,000 horsepower.

The LSX-LS3 aluminum cylinder heads feature 260cc L92-style rectangular intake ports and are fitted with 2.165-inch hollow-stem intake valves and 1.590-inch solid-stem exhaust valves. They provide excellent airflow capability that optimizes the power-building advantages of forced induction.

Chevrolet Performance delivers the LSX376-B15 without an intake manifold and other accessories, allowing the builder to tailor the induction system and other features to suit the forced-induction setup of choice.

The LSX376-B8 is a more economical version that is capable of approximately 8 pounds of boost, for engine producing approximately 600 horsepower. It is designed for production-style supercharger and turbo systems used without enhancements or modifications. Like the LSX376-B15, it features 9.0:1 compression and is delivered without an intake manifold and other accessories.

Founded in 1911 in Detroit, Chevrolet is now one of the world’s largest car brands, doing business in more than 140 countries and selling more than 4 million cars and trucks a year. Chevrolet provides customers with fuel-efficient vehicles that feature spirited performance, expressive design, and high quality. More information on Chevrolet models can be found at www.chevrolet.com.