Big Bore Kits

The Revolution Performance Bolt-On Big Bore Kit has proven itself time and time again on the dyno, but now it’s ready to prove itself to you! We’ve done the research for you, picked the proper components and packed on the savings in an all-inclusive kit ready for installation.

For maximum horsepower output, the Stage 3 kits are available in bigger cubic inch packages. These kits are custom tailored to your needs and budget. Call for details!

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Twin Cam Bolt-On Big Bore Kits

Twin Cam Bolt-On Big Bore Performance Kit includes the famous Revolution™ aerospace grade all aluminum cylinders with nickel-silicon-carbide electroplated bores. Also included are our new Revolution Performance pistons and high performance head gaskets. This is a true bolt-on kit and absolutely no machine work is required. Revolution™ cylinders are the only cylinders in the world that carry a lifetime warranty against warping and/or plating defects!

Choose either the 98 inch kit for your 99-06 or the 107 inch kit for your 07-up Twin Cam.

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Zipper's Muscle Kit

New from Zipper’s is the Muscle 107 kit for 2007-Up Twin Cam® engines. Zipper’s has carefully developed this package with optimized compression, porting, camshaft design and inlet flow, combined with our best-in-class finish work, extensive dyno and ride testing to deliver a very balanced engine kit that will not disappoint! The Muscle 107 delivers fantastic power curves with both torque and horsepower reaching north of 120. This power is very smooth and broad, with torque over 100 ft/lbs from below 3,000 RPM’s to above 6,000! Kit includes CNC porting with premium components on your heads, fi tting forged, 3.937” bore domed pistons to your cylinders, Red Shift® cams and dual piston cam chain tensioners, Axtell oil bypass valve, Pro-Taper pushrods, quality gaskets, high flow injectors and MaxFlow air cleaner assembly with a pre-programmed ThunderMax® EFI controller. TBW models require separate purchase of H-D® Screamin’ Eagle® 58mm throttle body (not included); everything else you need is supplied in a single part number!

Requires your heads and cylinders for modification. We keep exchange heads and cylinders in stock already modified for super quick turn-around; parts must be in nearly perfect cosmetic condition, expect the same from us. If preferred, Zipper’s can process your cores directly; expect 1-2 weeks completion time. You can also purchase any combination of kit components separately if desired.

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Stock Harley performance numbers:

Harley-Davidson Twin Cam (1450cc / 88” 45 degree single plug v-twin with F.I.) – 62hp & 77 ft lbs of torque

Harley-Davidson Twin Cam (1584cc / 96” 45 degree single plug v-twin with F.I.) – 66hp & 82 ft lbs of torque

Harley-Davidson Twin Cam (1688cc / 103” 45 degree single plug v-twin with F.I.) – 83hp & 95 ft lbs of torque

Harley-Davidson Twin Cam (1800cc / 110” 45 degree single plug v-twin with F.I.) – 95hp & 110 ft lbs of torque