Stock internal 318 redline??

33IMP said

My guess (note:Guess) is that the bottom end is probably safe to 6000/6200. Whether there is ANY point going there, or even trying to get there, is determined by head flow and camshaft/valvetrain.
Stock cam and springs? I see no benefit past 5200. Maybe less.

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shifting a stock 340@5200 with 3.23s and 727 gets you a 14.9 quarter
5800 in 1st 5600 in 2nd gets 14.3@97 mph and change
100s of passes
the motor reved to 6k cleanly the listed shift points speak for themselves
6500 7000 == you need sleeves
3.55s slighty less
3.91s slighty less then 3.55s
3.23s you need to rev it