• Machined cast iron with precision ground working surfaces
• This boring plate kit has panhead and shovelhead head bolt patterns in one end. The other end is machined with the cylinder base patterns of 1936-99 Big Twin engines, and 1986-2003 Harley-Davidson Sportster models. Spacers are available for Evolution engines which allow the cases to be bored without removing the cylinder studs.
• Spacers are not included in this kit.




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