LSX Crate Engine – Chevrolet Performance LSX376 B15 6.2L Gen IV Small Block Engine


  • 473 hp @ 6,000 rpm/444 lb.-ft. @ 5,000 rpm
  • High-flow LSX-LS3 6-bolt rectangular-port heads
  • LSX Cast iron 6-bolt block
  • Customize with your own intake manifold and other accessories

Shipping is free, but there is a delivery fee for residential addresses.

LSX376-B15 Crate Engine

Built for boost – and a lot of it.

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

Karl Kustoms delivers the LSX376-B15 without an intake manifold and other accessories, allowing you to tailor the induction system and other features to suit the forced-induction setup of your choice.

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?

Installation Notes

  • 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
Weight 539 lbs

LSX376-B15 Crate Engine Tech Specs

P/N 19355575

473 hp @ 6,000 rpm / 444 lb.-ft. @ 5,000 rpm

  • Engine Type: LSX-Series Gen IV Small-Block V-8
  • Displacement (cu in): 376 cu in (6.2L)
  • Bore x Stroke (in): 4.065 x 3.622 (103.25 x 92 mm)
  • Block (P/N 19260095): LSX cast-iron with 6-bolt, crossbolted main caps
  • Crankshaft (P/N 12603616): Forged steel
  • Connecting Rods (P/N 12604857): Forged powdered metal
  • Pistons (P/N 19259381): Forged aluminum
  • Camshaft Type (P/N 12638426): Hydraulic roller
  • Valve Lift (in): 0.560″ intake / 0.555″ exhaust
  • Camshaft Duration (@0.050 in): 210° intake / 230° exhaust
  • Cylinder Heads (P/N 19354243)
  • LSX-LS3 rectangular port; with “as cast” 68cc chambers and 6-bolt attachment
  • Valve Size (in): 2.160 intake / 1.550 exhaust
  • Compression ratio: 9.0:1
  • Rocker Arms (P/N 12669995 int): Investment-cast, roll trunnion
  • Rocker Arms (P/N 12681275 exh): Investment-cast, roll trunnion
  • Rocker Arm Ratio: 1.7:1
  • Recommended Fuel: Regular Pump
  • Maximum Recommended RPM: 6,600
  • Reluctor Wheel: 58x
  • Balanced: Internal

Dyno Chart




Chevrolet Performance Crate Engines carry a 24 Month or 50,000-mile warranty (whichever comes first) when installed by a qualified independent service center. Chevrolet Performance Crate Engines also come with a 30-day start-up warranty (parts only).

There are some additional limitations on the warranty – please see the official GM warranty documentation for more information.


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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