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2.080" Valve stuff goes 320 to 325 @ .700". Larger valve stuff can be a little better, but the pushrod window is a bit small to feed anything larger than a 2.100" effectively.
 

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ported my own very conservative on porting the pinch is the main issues.. cleaned up the runners raised roof a bit unshrouded the valve blended the throat and bowl..picked up flow all over 312 @700
also sounded good to 700lift but after that we could hear some terbulance ...I am not a porter just a guy with a few bits and i die grinder..
 

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