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You don't need custom valves, I'm using standard 11/32 "chevy" valves in these heads with + retainers and/or locks and can get 1.75 - 1.8 installed height springs in them. Thus I'd say leave the spring seats alone and get Jim Miller to do a Magnum rocker arm to take care of geometry problems.

The geometry was fairly good on the 520/408 though.



All magnum based heads except eddys have an 8mm stem so you still can not just drop those valves in there and they are thicker makeing more weight and slightly restrictin flow.

I am not causing global warming, I am just trying to hold off a impending Ice Age!