Wildcat 30%, what head shims on a SZH with VH?

[Mille aka Fredrik]

Have just switched to Wildcat 30% fuel (from home blended) and is wondering how much head shims I need with Viperhead. Have .016 on now.

Also have the Cline + BB carb on it with SB-18.

[Mille aka Fredrik]

Have done some testing now and it seems to work best with .024. Lots of power. :noteworthy

The shims ive tried is, .016, .020, .024 and .028

At .028 I lost top end power and at .016 got some predetonation.

Just letting you know :wink: