FITS ALL SB CHEVY ENGINES WHEN USING A SHORT WATER PUMP FITS SB CHEVY 265 283 305 327 350 383 400 USING A SHORT WATER PUMP PULLEY DIAMETER IS 6 9/16" PULLEY IS 2" TALL BOLT PATTERN IS 2 3/4" CENTER HOLE IS 1 1/8" MACHINED FROM BILLET ALUMINUM THESE FEATURE DEEP GROOVES TO PREVENT BELTS FROM SLIPPING .
