Bobber Plans and Engines by: Custom Choppers Guide
Thanks for your interest in our frames. The Rigid and the Soft-tail bobber frames were both designed to hold the Evolution 1370 CCM but the builder has the ability to modify the locations of the engine mount as needed for their specific application. The parts should mount in relatively the same location and keep in mind that you should use the same plate thicknesses and block sizes. You can either drill and tap the block for mounting or just use a through hole and use hardware. Feel free to let us know with any additional questions or concerns.