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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.
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