I've got the full 4.25 stroke, and I shift at 6500 at the track.
I've never really thought about running it really high continuously, 4K in 3rd gear or higher is a speeding ticket on road in any jurisdiction.
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77 Trans Am, 469 w/ported E-Heads via Kauffman, matched HSD intake, Butler Performance forged rotating assembly, Comp custom hyd roller, Q-jet, Art Carr 200 4R, 3.42s, 3 inch exhaust w/Doug's cutouts, D.U.I. Ignition. 7.40 in the 8th, 11.61@116.07 in the quarter...still tuning.
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