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For the extra $250, the summit motor has larger intake and exhaust valves and Hypereutectic pistons instead of the cast ones in the SDPC motor. I'd also hope for more compression out of the summit motor as opposed to the 8.5:1 SDPC piece.
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'99 Z28 M6 w/ Long tubes/4" exhaust, air lid+tune 349whp
'91 Z28 cam'd/carb'd w/ manual th-350 and a 9"
'89 Formula350 w/ T-Ram injected motor coming soon
'85 Trans Am L69 5speed car w/ t-tops and a leather gut. (Hers)
'04 WRX w/ turbo swap + (Traded/sold)
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