Cummins Engine Swap Kits

CMW Trucks - 1947 - 1972 Chevy Truck Parts


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Discontinued - LS1 5.7L without ECM and Wire Harness - A new small-block legend in its own time!

When GM dared to release a redesigned small-block in 1997, it succeeded beyond the expectations of enthusiasts around the world. Known as the LS Family V-8 small-block, the first and most popular version is the high-performance LS1—available here as a complete crate engine from GM Performance Parts.

In many ways, the LS1 is superior to any small-block that came before it. A deep-skirt, six-bolt-main block, with structural oil pan and other carefully engineered features, helps make the LS1 a strong, smooth running and dependable engine. A highlift camshaft actuating big 2.00/1.55 valves in symmetrical-port cylinder heads helps make it a uncompromised performer.

The engine is rated at 350 horsepower and 365 lb.-ft. of torque. The engine includes a GTO-style oil pan, electronic drive-bywire throttle body, intake manifold, exhaust manifolds, fuel rail with injectors, balancer, and 14" automatic transmission flexplate. It makes a great performance engine for your performance vehicle project—just add your wiring and electronics.

A handy reference guide is available to help install the engine in older cars with minimal guesswork.

Go high-tech with your next project!

Possible Applications

  • The perfect replacement engine for your Gen 4 Z28
  • Add a high-tech twist to an old friend
  • Discover the potential of a fuel-injected small-block Chevy.

*Applications have not been validated. They are merely suggestions of how you might enjoy your GM Performance Parts crate engine. Some applications may affect engine warranty. See specific warranty information. Some applications may not be emission legal; check state and local ordinances.

Part Number: 17801267
Engine type: LS Series small-block V-8
Displacement (cu in): 346 (5.7L)
Bore x stroke (in): 3.90 x 3.62 (99 x 92 mm)
Block (P/N 12561166): Cast aluminum with 6-bolt, cross-bolted main caps
Crankshaft (P/N 89017522): Nodular iron
Connecting rods (P/N 12568734): Powdered metal steel
Pistons (P/N 88984245): Hypereutectic aluminum
Camshaft type (P/N 12560965): Hydraulic roller
Camshaft lift (in): .500 intake / .500 exhaust
Camshaft duration (@.050 in): 200'c1 intake / 203'c1 exhaust
Cylinder heads (P/N 12559855): Aluminum, symmetrical port
Valve size (in): 2.00 intake / 1.55 exhaust
Compression ratio: 10.25:1
Rocker Arms (P/N 10214664): Investment cast, roller trunnion
Rocker arm ratio: 1.7:1
Recommended fuel: 92 octane
Maximum rpm: 6000
Reluctor wheel: 24X

Chevy Performance LS1 5.7 Liter Engine Image

Part #:17801267

LS1 5.7 liter dyno image

Installation Notes

  • Crate engine kit includes ECM (shown) and wire harness that allows the engine to be installed with a four-speed (4L60 or similar) automatic transmission in a pre-1977 vehicle.
  • 14" automatic transmission flexplate included.