3 Groove Crankshaft Pulley, 2 Groove Water Pump Pulley and 1 Groove Alternator Pulley for 283, 302, 327, 305, 350 and 400 engines with long water pump. NOTE: LONG WATER PUMP (LWP) ENGINES ARE 7.0 FROM FACE OF WATER PUMP TO BLOCK. CHEVY 283, 302, 327, 305, 350 AND 400 ENGINES WITH LONG WATER PUMP.
1969 - 1986 Chevy Small Block Engines came with the long pump from the factory. 2 Groove Water Pump Pulley. Professional Installation is Highly Recommended.