Home Shop Engine Power Kits S&S 3-5/8” Big Bore Kits for Shovelhead
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S&S 3-5/8” Big Bore Kits for Shovelhead

For all Shovelhead Big Twins. More displacement with stock-like reliability that makes those engines perfectly suited for long two-up trips. When installed in a stock 80cui./1343 cc engine the displacement increases to 1442 cc @ 7.5:1 compression. Cases and heads must be bored for the larger cylinders. S&S Big Bore cylinders feature much more stability than original cylinders with all critical areas reinforced. Each complete kit contains:

Big Bore front and rear cylinder, two pistons with rings and bolts, head and base gaskets as well as head bolts and S&S base nuts.

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Installation on stock 74” engines is not recommended as compression ratio is very low (6.1:1), which results in lack of performance.
S&S Power Kits

S&S Power Kits

Since the first V-twin rolled out of Milwaukee there were people who thought about increasing the displacement in their search for more horsepower and since 1958 there´s none who does this better than S&S. Stroker flywheel assemblies and big bore cylinders, installed as separate components or in combinations allow to achieve various displacement increases. Depending on your personal needs and preferences choose from different kits for increases up to 116 cubic inches. The performance of S&S components has been proven in thousands of engines on the open highways as well as on the race tracks of the world and the brand name is synonymous for highest quality in material and guaranteed positive horsepower results.
Big Bore kit by S&S; fits Shovelhead Big Twin 1966-1984; nominal bore: 3-5/8 ”; compression: 7.5:1; with forged pistons
W&W# Picture net price* Available from warehouse Germany?
64-001 S&S 3-5/8” Big Bore Kits for Shovelhead $1,363.47 kit
in stock
* United States of America: Tax free shipping. Please check your local import fees.

Spare parts:

  • 63-996

    63-996 Gasket by S&S; for Cylinder head; fits Shovelhead; copper; nominal bore: 3-5/8 ”; 0.035” thick; gross weight: 60 g


  • 58-130

    58-130 Gasket »SLS« by Cometic Gasket; for Cylinder base; fits Shovelhead; steel / fluoroelastomer; nominal bore: 3-5/8 ”; 0.020” thick; gross weight: 40 g

  • 55-399

    55-399 Gasket kit by James Gaskets; for Cylinder base / Cylinder head; fits Shovelhead; with PTFE coated head gasket, paper base gasket; nominal bore: 3-5/8 ”; gross ...

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