Set the intake in dry (no gaskets) and slide it to one side. Observe the gap on the other head. If it's jacked, get the intake valley angle corrected; you'll be much happier. My BBO Performer was out .013 (measured with a feeler gauge) with the above method from the top to zero at the base. So, I had the machine shop take. 0065 from the bottom to the top off each side, and it was golden afterwards.
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