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Originally Posted by wrench87
this is why i get confused on what to do, i set out to build a 427 using all new parts to find out no one makes a new 3.78 crank. with scat i can go 3.98,4.125 or the 4.250 stroke they all cost about the same i wanted a 427 not a 451 or a 468 or a 482. i thought also with the bigger strokers you need a lot more cyl head to feed them the stage 3 heads are over 3k.
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An original 3.78 crank cast/steel will be strong enough for normally aspirated engines. As everybody has eluded to, a stroker crank will give more torque/hp in the lower rpm range, peak hp will be at lower rpm, although absolute peak hp may not be that less.
Whether you run a stock or stroker crank, power can be excessive, and acceleration brutal, deadly.
I actually have a stock stroke 427, cast crank, and had it chassis dyno'd, and it surprised me how much torque/hp it made. 488 rwtq @ 3900 rpm's, which is about 600 at the flywheel, more than what I would have expected from a stock displacement 427. I wanted a stock stroke 427, just like it would have come from Ford/Shelby.