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

For all Evolution Big Twins. More displacement with stock-like reliability that makes those engines perfectly suited for long two-up trips. When installed in a stock 1343 cc engine the displacement increases to 1442 cc. Cases must be bored for the larger cylinders. S&S Big Bore cylinders feature much more stability than original cylinders with all critical areas reinforced. A slightly increased compression ratio provides additional torque but does not affect the longevity. Each complete kit contains Big Bore front and rear cylinder, two pistons with rings and bolts, head and base gaskets.

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The cylinders are 4.5 mm shorter than stock. Adjustable pushrods and shorter cover retainers are required.
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 Evolution Big Twin 1984-1999; aluminum, cast finish / bare; length: 5.375”; nominal bore: 3-5/8 ”; compression: 9.5:1; with forged pistons
W&W# Picture net price* Available from warehouse Germany?
64-003 S&S 3-5/8” Big Bore Kits for Evolution Big Twin $1,175.45 kit
in stock
* United States of America: Tax free shipping. Please check your local import fees.


  • 57-428

    57-428 Gasket by James Gaskets; for Cylinder base; fits Evolution; rubberized steel with silicone seal; nominal bore: 3-5/8 ”; 0.020” thick; gross weight: 40 g

  • 55-409

    55-409 Gasket kit by James Gaskets; for Cylinder base / Cylinder head; Evolution engine; nominal bore: 3-5/8 ”; gross weight: 10 g

  • Retainers for Pushrod Covers

    Retainers for Pushrod Covers Upper retainers only, for OEM-style pushrod covers.

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