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Yea, it looks like the P7 would make a little more power. 
Holy Smokes!!! Is that a W5 head on the bottom. I knew the P7s were big but WOW! I didnt realize. Im so nervous about buying used Nascar stuff, or else I would buy some P7 top end stuff and then be patient for the XR2 blocks that will fit P7 stuff. Im anxious to see how the XR2 blocks and the P7 heads work out. If I could get the heads, I would like basically everything including rockers,valves, valve covers. I think this stuff will be fun. All the cup rockers are crazy ratios it seems, like 1.95:1 ratios.
10.53 @ 125mph. 1.37 60 foot. Caltracs and Monoleafs, AFCO shocks.
Heads by INDIO MOTOR MACHINE; IMM.
CP Pistons, PC Carbs.
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