Not Ranked
DD,
I ran some numbers....I couldn't find any flow numbers for GT-40X, so I used some ported GT-40P heads that I found....the numbers are around the same as Summit Racing shows 240cfm at .550 lift.
I used an RPM Air Gap dual plane intake with the cam I spec'd above, roller lifters, and a 650cfm carb. 10.5:1 compression.
436hp @ 6000 revs
409 lb-ft @ 4500 revs
It does seem a little optimistic, so I think the flow numbers for the heads were a little above average....
But I think you should see 400hp or a touch over with this combo.
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