Crower Valve Springs - Dual AS02521 Steel bracket has three 3/4"

Steel bracket has three 3/4" holes

Rough idle

Go with the original---AVS Ventvisor

1965-1965 GMC PB1500 Series

Crower Valve Springs - Dual AS02521 Steel bracket has three 3/4"Product Description: Valve Spring Dual Spring 258 lb in Spring Rate 0. 910 in Coil Bind 1. 385 in OD Set of 8 Crower Cams and Equipment Company, Inc., is a leading producer of aftermarket camshafts and valve train components. But over the years Crower has developed a more diverse line of products. Today, Crower is the world's largest manufacturer of aftermarket crankshafts and connecting rods, and the Crower line of clutches has been dominating the