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Then you need to go ot the basics and stop thinking about forced inducation for the time being. A stock A12 revs to 5000 no problem. Add a weber carb and it should go to 6000 without a noticeable power dropoff.

A stocker generally will rev over 6000 if the springs are good (stock springs) but power drops off fast after 5000, which is the peak torque spot.

Test this in 2nd or 3rd gear. In fourth gear you are areodynamically limited.