LSX376-B15 Crate Engine

Karl Kustoms LSX376-B15 crate engine is the perfect - and surprisingly affordable - foundation for a supercharged or turbocharged monster build. With 473 hp and 444 lb.-ft. of torque on tap in a naturally aspirated configuration, the LSX376 Gen 4 small block is already a force to be reckoned with even without forced induction.  

However, built with a forged steel crankshaft and connecting rods, and forged aluminum pistons, Chevy engineered the rotating assembly to handle a massive 15 PSI of boost. So, turn up the wick, this LS can take the heat. The LSX376-B15 also features:

• High-flow rectangular port LSX cylinder heads with six-bolt attachment
• Forged internals capable of turning at a 6,600 rpm redline
• 473 naturally aspirated hp at 6,000 rpm
• 444 naturally aspirated lb. ft. of torque at 5,000 rpm

What”s Included

Important Information

• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications
• You do have a strong transmission and rear axle, don”t you– Can we suggest a Karl Kustoms SuperMatic 6L80-E Automatic Transmission that can handle up to 650 lb.-ft. of output torque–

• Assembly shipped without intake manifold or oil pan (dust shield installed for shipment)
• Assembly does not include any electronics
• Requires LSX Ignition Controller (P/N 19171130) for carbureted applications
• Includes LSX 8-bolt crank flange
• Recommended max boost – 15 PSI
• Replaces 19417356, 19355575, 19332320