Page 53 of GM Performance Parts 2006 Catalog by GM Parts Direct

ZZ383/425 DYNO CHART Horsepower: 425 5400 rpm Torque (lb-ft): 449 4500 rpm 500 400 300 200 100 0 RPM POSSIBLE APPLICATIONS* The perfect small-block for your 55-57 shoebox An 11-second starting point for your street/strip car A street car that deserves big power A weekend race car that sees a lot of action *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 page 320 for specific warranty information. Some applications may not be emission legal; check state and local ordinances. 51 INSTALLATION NOTES Requires addition of carburetor, ignition, intake manifold, fuel pump, water pump and starter (not included). 425-horsepower rating achieved during GM testing with high-rise single-plane intake manifold P/N 12496822 and a 750-cfm Demon carburetor with vacuum secondaries. GMPP dual-plane intake manifold P/N 12366573 may be used to avoid hood clearance problems, but peak power may decrease by approximately 15-20 horsepower. Comes with 12.75" automatic transmission flexplate. Requires 1986-1999 350-style externally balanced flywheel for manual transmission. See chart on page 171. Intended for pre-1977 street vehicles and all off-road vehicles.

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