[DanEC]

I will admit I was a little apprehensive when I selected the 4.25 crank for mine having been mostly a magazine engine builder for the most part and buying into the long strokes don't rev hype. But I have a Lightning PU and a Mustang GT with those long stroke modular motors and they rev like crazy so I went ahead with it. I mated it with a mid-weight Mcleod aluminum flywheel and I swear this hydraulic cam 459 revs like an electric motor nearly. I think a lot of it is in the balance work and care in assembly.

But, I can kind of agree with Patrick's view. If building a mechanical lifter, high compression, high reving motor a 4.125 crank makes Spock-type logical sense. If building a hydraulic lifter, mid-range torque motor, a 4.25 crank would appeal to Spock.

But from my limited experience I'm with Brent.