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"I figured since the intake and exaust valve size was the same it should be good to go. "
That could be where the difference is.
I had the M--6007-D392 w/ GT-40 heads (M-6049-X303).These heads come with 1.94" intake and 1.54" exhaust.
The AFR185 is 2.02" and 1.60".
Last edited by 392cobra; 03-26-2006 at 08:24 AM..
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