Motor

Some can — cam plates and certain air-cooled heads built on the same block architecture often bolt straight across. Others are machine-matched to CVO tolerances that the standard case doesn't meet, and fitting them blind can introduce clearance issues. Cross-reference the part number against the OEM fitment chart for your VIN before buying; a CVO-branded number isn't a guaranteed fit on a non-CVO engine.

On a high-compression big-bore M8, close the gap to approximately 0.030 to 0.034 inches — the increased compression demands a tighter gap to prevent spark blowout under load. Running the wider stock gap will cause full-throttle misfires even with a fresh tune. Confirm the specific setting with your kit supplier; different combustion chamber shapes affect the ideal number.

It's not a bolt-on swap. The Evo pump body uses a different port layout and mounting pattern from the Shovelhead case, so fitting it requires either a machined adapter plate or case machining. It is done, but it's a machine-shop job — confirm the specific case casting number against the pump manufacturer's fitment notes before committing.