For what it`s worth, I have a 78 Ford Fairmont bracket car with a 428 Cobra Jet and a Jerico 4 speed that runs 10.0`s at 132MPH, has gone 1.29 60 foot. All the 428 Fords came with cast cranks, I don`t rev my engine to 7000 RPM, but it does hit 6700 thru the traps. The crank is a .010" under stock Ford 40 plus year old piece, and has been in the car for 14 seasons now, never had any problems with the crank. I have the crank MagnaFluxed every 4 or 5 years when I freshen the engine, and so far, it looks like it will outlast me! I have heard that sitting on a 2 step for a long time isn`t a great idea, but I don`t normally do that anyhow. Maybe the Ford cranks are just a bit better!