**Note: Camshaft incorporates an integral cast iron distributor drive gear, aluminum-bronze distributor drive gear not required.

***Note: Beginning in 1987, most of the V-6 and V-8 engines were equipped with hydraulic roller camshafts. There are differences in the block to accommodate a cam retention thrust plate and the anti-rotation mechanism for the lifters. These blocks are identifiable by bolt holes for a cam retention plate under the upper timing sprocket, as well as bosses and tapped holes in the lifter valley for lifter retention hardware. The camshafts on these engines have a step nose and smaller bolt circle on the front of the cam. An earlier model camshaft may be used in these blocks by using the appropriate timing chain set and adding a thrust button when using a roller cam.
1988-99 GM 305 and 350 V-8 engines (and some 1987 350 V-8 engines) use a different configuration camshaft core than the 1957-87 engines and cannot be interchanged.

FAIR IDLE, MODERATE PERFORMANCE USAGE, GOOD MID-RANGE HP, MILD BRACKET RACING,AUTO TRANS W/2500+ CONVERTER, 3000-3800 CRUISE RPM, 9.5 TO 11.0 COMP.RATIO ADVISED.