How street able are these 340 stroker motors?

autoxcuda said

neither will a larger cam in a 340 making the same HP and TQ.

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I agree, but both need to have a cam with the most efficient lo speed torque value at the cruising rpm.
The small motor should do better with careful cam selection.The stock 340 head is very efficient on the small block.Many stock 340's got 20 mpg.Geared for the cam they still do very well when built for power.Strokers...not so much.