Description:

Stage 1: single-cam motor. Excellent midrange and top-end power increase. Uses stock auto-decompression mechanism. Uses stock valve springs.

Stage 2: single-cam motor. More top-end than Stage 1. Requires Hot Cams spring kit part number SKYFM660S2. Uses stock auto-decompression mechanism.

Stage 3: single-cam motor. Specifically designed for Hot Rods big bore/stroker kit. Not for stock displacement. Requires Hot Cams valve spring kit part number SKYFM660S2. Uses stock auto-decompression mechanism.