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Originally Posted by 392cobra
"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".
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I was referring to the intake and exaust for the "Z" heads that Ford said would bolt on no problem. They are 2.02 and 1.60.