4° Insert → 4° Domed Piston. Squish band is angled 4 degrees. MUST be used with the 4° piston, METEOR PISTON, TM OEM PISTON, etc.
4° Insert → 4° Domed Piston. Squish band is angled 4 degrees. MUST be used with the 4° piston, METEOR PISTON, TM OEM PISTON, etc.