89" High Compression Stroker Pistons For 1984-'99 HD® Big Twins And 1986-'03 HD® Sportster® Models W/ Super Stock Heads - +.020"

These high compression 3-1/2" bore forged stroker pistons for 1984-'99 HD^® big twins are a high compression option for 89" stroker kits for 1984-'99 with 4-5/8" stroke flywheels and S&S^® Super Stock heads. 12:1 compression . These pistons may also be used in stock stroke 1200cc HD^® Sportster^® models with S&S^® Super Stock heads.10:1 compression. +.020" oversize.