Relocating A Cam Hole on a 1973 Shovelhead Motor

Published on October 1, 2025
Duration: 8:32

This video demonstrates an advanced gunsmithing technique for relocating a cam hole on a 1973 Shovelhead Harley-Davidson alternator motor. The process involves welding the original hole, precisely locating the new position using a milling machine with a digital readout and dial indicator, and then carefully machining the new hole to accept a cam bearing. The instructor emphasizes the importance of using the right equipment for accuracy and efficiency.

Quick Summary

To relocate a cam hole on a 1973 Shovelhead Harley-Davidson motor, first weld the original hole shut and flatten the area. Then, use a milling machine with a digital readout and dial indicator to precisely locate the new center. Finally, machine the hole to size using a specialized endmill that is 3-4 thousandths of an inch smaller than the cam bearing.

Frequently Asked Questions

What is the first step in relocating a cam hole on a 1973 Shovelhead motor?

The initial step involves completely welding shut the existing cam hole using solid welding rod. After welding, the area needs to be flattened to create a solid surface for subsequent machining operations.

How do you precisely locate the new cam hole position on a Harley-Davidson engine case?

Precision is achieved by using a milling machine equipped with a digital readout and a dial indicator. A template is used to find the approximate center, and the dial indicator is manipulated to find the exact center where the needle consistently stays on zero.

What type of tool is used for the final sizing of the relocated cam hole?

A specialized endmill is used for the final sizing. This endmill is intentionally manufactured 3 to 4 thousandths of an inch smaller than the cam bearing that will be installed, ensuring a snug and accurate fit.

What are the key tools required for relocating a cam hole on a vintage motorcycle engine?

Essential tools include a milling machine with a digital readout, a dial indicator, specialized endmills, various drill bits, cutting oil, a hammer, and a specific punch for installing cam bearings. Templates are also crucial for accurate positioning.

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