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I have a set of standard bore speed pro forged pistons with valve reliefs. I want to know how much lift/duration i can run with these. I will most likely run victor jr heads with these pistons.
 

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No way it will clear a 2.02 valve..

Mabe a 1.90

They releifs aren't any bigger than stock.. Mabe even smaller..
 

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With my Speedpros, Crane 2031 cam, and Edelbrock 60379s(1.90/1.60) I had about .010" of radial clearance. The eyebrows just arent big enough. With Victors you will need alot of fly cutting.
 
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