These fixtures are designed to hold cases and heads when boring them for larger bore cylinders.

*SPECIAL ORDER PRODUCTS*
Products that are special orders can take 2-3 weeks to ship. A Zipper’s representative will contact you.

#798-305 – This boring plate kit is designed for boring stock Twin Cam® cases to accept 4” and 4-1/8” bore cylinders. A spacer is included with the kit which allows the cases to be bored without removing the cylinder studs.

#798-306 – This boring plate kit has Panhead and Shovelhead head bolt patterns in one end while the other end is machined with the cylinder base patterns of 1936-1999 Big Twin and 1986-2003 Sportster® cases. Spacers below are available for Evolution® engines which allow the cases to be bored without removing the cylinder studs.

#798-307 – 3-11/16” cylinder stud spacer, required for ‘86-’03 XL and ‘84-’99 BT cases.

#798-308 – 7/8” cylinder stud spacer must be used with #798-307 spacer for ‘84-’99 BT cases.

Weight 1 lbs
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