The E7TE heads are both on the mustang and truck. Same head. Therefore, same volume. As far as clearance. I'm assuming that you have flat topped pistons. I am running flat toppers with a stock HO cam and have no problems. I've heard that anything other than stock lift and duration will cause bad probs, but not sure. You're right about the compression, it is around 9:1 or so.
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Michael Black
Quantum Motorsports
Norman, Oklahoma
1988 Merc Cougar 5.0 HO, P&Ped heads, 2.25" custom mandrel bent dual pipes, T5 five speed tranny
15.43 @ 91.08mph (not shabby for a 3600 pound car)
60' 2.453 Street tires suck!!!
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