Thread: Measuring for coil bind/guide interference?

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There are a couple of ways to do this.

Not Recommended:
Sink the valve on its seat a little to move the spring mounting surface on the bottom of the retainer further away from the head. Use shims between the spring mounting surface of the retainer and head to establish correct spring installed height.

Recommended but expensive: (new valves)
Use a little longer valve to move the spring mounting surface on the bottom of the retainer further away from the head. Use shims between the spring mounting surface of the retainer and head to establish correct spring installed height.

Recommended and not so expensive: (new retainers)
Consult with the cam grinder who furnished your cam to supply new retainers which will move the spring mounting surface on the bottom of the retainer and the center part of the retainer which will interfere with the seal further away from the head. Use shims between the spring mounting surface of the retainer and head to establish correct spring installed height.