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Quote:

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The real power is in the cam and ignition timing and carb tuning.

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The real power is in the whole combination, but it's been my experience that a good set of heads is #1 in the combination.

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Obviously the heads are #1, but they were already
talked about. His chosen combo (cam/carb and ignition timing) has to be set up and fine tuned
(trial and error at the track) for max power. Seems like the poster wants to use what he has for the 400, and to RUN with less cash outlay possible. And YES it can be and HAS been done (since the B motor was built)! Thanks Dean for stating that point!