Note : Early 3-bolt crank pulleys generally bolt directly to the damper with flanged pulley pilot (damper is drilled for 3- and 4-bolt patterns). PART NUMBER ENGINE CRANK PULLEY BOLT PATTERN SPACER THICKNESS M-8510-A351 302/351W 4 0.350" M-8510-B351 302/351W 4 0.950" M-8510-C351 302/351W 4 0.875" M-8510-D351 302/351W 4 0.909".
