My experiance with them is relative to a BOSS302 motor, small CID, relatively huge heads/ports/valves. On a B2 motor, reviews tend to be mixed. On something with +50 CID, I beleive their value would be even less. BTW, they are available for both the intake as wwell as exhaust side of the head. Good luck.
http://www.mpgheads.com/
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