Red line is all about the valve train. The crank and pistons could handle high RPM no problem. Hydrolic lifters however can't rev too high. The 4.6 will rev the highest because it has OHC. Since there are no lifters if has the highest reving capabilty. As far as the lifter motors, I'm not sure which ones can rev higher.
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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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