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In my opinion 318 Street car that's running in the mid 12s is definitely killer! You could continue to build it all the way up with a solid roller killer heads and tap into the mid 8000 RPM range but how many times? I think a huge part of a street motor is its durability,, riding the razor's edge of a maximum output of a stock block not really my thing. And definitely not a good recipe for the street. My two cents