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Zipper's 120” Stroker Big Bore Kit for 1999-Up Twin Cam® Engines Double click on above image to view full picture

Zipper's 120” Stroker Big Bore Kit for 1999-Up Twin Cam® Engines

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As low as: $57.50

Price as configured: $0.00

Overview

These cylinders, when used with our 4-1/2” stroker crankshaft, increase displacement to 120”. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .120” longer than stock and require a slightly longer intake manifold or throttle body. Modest height increase easily fits in all frames.

In compliance with ARB emissions laws, this product is not sold or shipped to California.

Price as configured: $0.00

Details

These cylinders, when used with our 4-1/2” stroker crankshaft, increase displacement to 120”. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .120” longer than stock and require a slightly longer intake manifold or throttle body. Modest height increase easily fits in all frames.

Zippers 4-1/8” bore cylinders allow the Twin Cam® owner the ability to increase their engine’s displacement with the largest bore you can safely fit to the stock case. These are completely new aluminum cylinders, cast around a .240” thick iron liner, 60% thicker than the stock cylinder liner. This thicker liner reduces twist and flex in an aluminum cylinder, providing a very stable bore for the rings to maintain seal. These cylinders can be ordered with the bore undersize for final fit by the purchaser, or sized by Zippers with our 4-1/8” big bore pistons. Top them off with our CNC ported TC cylinder heads, for a complete top end performance package. Installation requires engine disassembly for case boring (a service available from our machine shop). Cylinder/piston kits include head and base gaskets (cylinders-only do not include gaskets, order separately). Available in as-cast aluminum finish or powder-coated black with machined finsh.

 

This product is not for sale or use on pollution controlled vehicles.

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Additional Information

Brand Zipper's
Engine Type Big Twin®, Twin Cam®
Model N/A
Year Range N/A
Transmission Type N/A
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