Chevy LS1 5.7L with ECM and Wire Harness


Get a complete LS1 engine assembly with electronics and wiring harness for easy installation. This crate engine package provides awesome small block LS power. GMP LS1 engine comes with composite intake manifold, single-bore throttle body, fuel rail with injectors, balancer, log-style exhaust manifolds, water pump and a 14" flexplate for auto. transmissions. The oil pan used is from the Camaro/Firebird. This is the perfect engine to add to an older car to get modern LS power!

Possible Applications

  • Gen 4 Z28 Replacement
  • High tech HP
  • Add a fuel-injected LS 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: 25534322
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

LS1 5.7 liter engine image

Part #:25534322*

LS1 ECM computer 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.