Our pistons are Forged Aluminum Pistons and are of Superior Quality. They are slightly higher compression than factory pistons and run great with modern fuels. Rings, wrist pins, and keepers are included with the pistons.
61" Pistons all have .625" wrist pins and have a compression height of 1.8"
74" Pistons all have .791" wrist pins and have a compression height of 1.6"
We do not make standard pistons.
Piston net diameter is measured at the base of the piston skirt.
Make sure your cylinders are Round and Straight beforemeasuring for pistons. Harley tapered the cylinders in these motors and that taper needs to be removed. We recommend .005" to .010" clearance on pistons. We try to set up at .008" clearance. Loose is good! We highly recommend running a lead additive in you fuel such as Marvel Mystery Oil. It will help with increased lubrication at the top end and will also help to keep engine temps lower. Limited Quantities of sizes are available. First come, first serve. We will not hold or set aside. *There will be a 20% restocking fee on returned pistons. Non-negotiable. (Pistons do not qualify for any discounts)