Roush vs 427FE vs Keith Craft

[blykins]

Originally Posted by CobraEd

I agree with you on the oil 347 issue. It is just an old wives tale. I also agree about long stroke vs short stroke, but that has nothing to do with the issue at hand. An FE or 385 series crank and rods are noticably heavier and it takes more power/time to spin them up vs a small block unit. It is about rotational weight and nothing more. Again, think of an aluminum flywheel vs a steel one. A proven scenario over and over again and universally accepted that an aluminum unit will spin up much faster. The exact same physics applies to a heavier crank and rods. The premise cannot apply to one and not the other. Both are about accelerating rotational mass. No difference. :-)



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My point was Ed, that was too broad of a statement to make: "the small block will rev much quicker"...

Which FE's? Which small block? What does "rev" mean? Peak hp rpm? Sitting at idle and winging the throttle?

I will say that you are correct in that *some* FE's rotating assemblies are heavier, but not all. If you compare the bobweights between a 427W and a 428 FE, depending on what parts you use, the bobweights can be very similar.

I have also built many 4.250" stroke FE's that rev like chainsaws and pull past 7000 rpm.

It is certainly a case of physics, but you just can't make that broad of a statement, because it's not always true...thus being a lot of the issues about forum misconceptions.

BTW, thanks for the bump.