Chevy LS1 5.7L without ECM and Wire Harness

GM released a new small block called the LS line of engines. The LS1 crate engine was the first LS engine and comes with a deep skirt, six bolt main block. Oil pans are structural in nature. This LS1 has a high lift cam pushing on 2 inch intake valves and 1.55 exhaust valves. Symmetrical port cylinder heads flow very well to make great power.

Rated at 350 horsepower and 365 lb.-ft. of torque, you'll like the performance of the LS1. This crate 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. You add your wiring and electronics.

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: 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

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.