engine because of cost savings, as engines must last 1,500 miles and rebuilds are about one-thirds the cost of a new engine. LSX376 Chevrolet Performance LSX376 crate engines are updated versions of LSX crate engine family designed to support up to . All models use the Chevrolet Performance LSX Bowtie block. LSX376-B15 (part number 19299306) includes forged steel crankshaft, forged powdered metal I-beam rods (both the crankshaft and rods from LSA engine) and forged aluminum pistons (9.0:1 compression), high-flow rectangular-port six-bolt LSX-LS3 heads for supercharged and turbocharged combinations producing up to of boost and up to about . LSX376-B8 (part number 19171049) is a more economical version that is capable of approximately , for engine producing approximately . It is designed for production-style supercharger and turbo systems used without enhancements or modifications. LSX454 and LSX454R Chevrolet Performance created the 454 big-block Chevy race engine in 1970 and continued production of the crate engine through 2001. The addition of EFI and picking up the Vortec 7400 name took place in 1996 which was replaced with the 8100 series Vortec platform once the 7400 was retired. Chevrolet Performance released the 454 again in 2011 as a small-block crate engine dubbed the LSX454R officially rated at 776 horsepower at 7,000 rpm and 649 lb-ft of torque at 5,100 rpm. The LSX454R was discontinued in July 2018 but will be recorded as one of the more powerful LS crate engines to be assembled from Chevy Performance. Noonan Race Engineering Noonan Race Engineering developed two billet aluminum blocks based on the LS engine. Bore sizes are up to 4.185 in and stroke up to 4.5 in are available, making a 495 cu in displacement possible. The billet construction provides added block integrity suited to high horsepower applications. The block design incorporates turbocharger pressure feed lines in the front of the valley and oil dump ports in the side of the block to return oil to the sump. In addition to the solid block, a waterjacketed version was also designed to provide better cooling options for street or endurance purposes. Noonan also has developed intake manifolds for the LS; specifically for turbocharging or twin turbo charging or supercharging. See also Chevrolet 90° V6 engine General Motors Vortec engine List of GM engines References External links Gen 5 press kit History of the Gen III LS1 V8 Engine V8 engines Engines by model Gasoline engines by model