I wouldn't use any thing over a 4.00" crank in a high power stock block combo,preferably a 3.75" crank. An extra pound or two of boost will more than make up for the (maybe) less low down torque, and will be much easier on the stock block. Side loading is dramatically increased with long strokes. Rod length and piston height (and piston speed) can be better manipulated with shorter stroke. JMO.
The trend in turbo solid roller cams these days seems to be shorter duration but with massive/aggressive lift, spring eaters for sure. Necessary for very high hp though I suppose.
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