S&S, forged 3-5/8" big bore piston kit. +.020"

Fits all 3-5/8" big bore 36-84 B.T. models with 4-1/4" to 5" stroke flywheels with the correct flywheel diameter of 8-1/2. Note that 4-3/4" & 5" strokes require 8-1/4 small diameter flywheels; all in combination with the appropriate cylinder length like mentioned below. Advanced alloy and piston skirt profile is used for low noise and long engine life. Piston dome volume 30cc; piston deck height 1.260". 88" (4-1/4" stroke; 8-1/2" flywheel dia.; 8.5:1 CR; 5.330" cyl. length). 93" (4-1/2" stroke; 8-1/2" flywheel dia.; 8.5:1 CR; 5.405" cyl. length). 93" HC (4-1/2" stroke; 8-1/2" flywheel dia.; 9.1:1 CR; 5.363" cyl. length). 96" (4-5/8" stroke; 8-1/2" flywheel dia.; 9.1:1 CR; 5.440" cyl.length). 98" (4-3/4" stroke; 8-1/4" flywheel dia.; 8.9:1 CR; 5.530" cyl. length). 103" (5" stroke; 8-1/4" flywheel dia.; 9.7:1; 5.630" cylinder length). Pistons include wrist pins; wrist pin clips and piston rings. Note: For a higher compression ratio S&S advises shortening the cylinders. Shortening cyl. .060" will produce approx. 1 point increase in CR. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.