S&S 86" Stock Bore Stroker Kit For 1970-'84 Big TwinsStock bore stroker kits have always been an economical way to increase the displacement of your engine. The S&S 84" stock bore Hot Set Up Kit upgrades 74" and 80" shovelhead engines to 86" displacement at approximately 9. 4: 1 or 8: 1 compression. Includes a dynamically balanced 4 5 8" stroke flywheel assembly complete with S&S heavy duty connecting rods and mainshafts. Stock bore stroker kits reuse the stock cylinders, saving cost and retaining stock
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S&S 86" Stock Bore Stroker Kit For 1970-'84 Big Twins