Proform Adjustable Piston Ring Compressor 4" - 4.090" - Blue 3450 MSD supplies different advance springs

MSD supplies different advance springs and stop bushings so you can tune a timing curve to match your Nailheads needs

GM A-Body / F-Body / X-Body 1969-78

Single-Layer Pyrovatex® FRC Construction

2006-2006 Chevrolet Trailblazer

428 lb/in Spring Rate

Proform Adjustable Piston Ring Compressor 4" - 4.090" - Blue 3450 MSD supplies different advance springsPutting the connecting rod through first, simply place the piston (with rings) into the tapered end of the ring compressor. Tighten the compressor snugly around the base of the piston. Then lay the compressor flat on the engine cylinder bore. NOTE: Image shows #PFM66766 and is for reference only. PROFORM invites racers to experience the strength, innovation, and power behind the PROFORM brand. PROFORM Parts (Specialty Auto Parts U. S. A., Inc.) is a