Quote:
Originally Posted by Stan Weiss
Mike,
I know because of the bore spacing that they could not go really big bore, but they could have gone 4.2" bore and 4.11" stroke and gotten the same cubic inches.
Stan
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Agree. Very limited by bore spacing.
I am currently running a 4.050 stroke in my 421 and feel it is a great combo.
Have a few 421/428's as back ups and they all ran as well as expected.
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65 GTO, Tiger Gold, Nostalgia Super Stock 421, 2-Carter AFB carbs, Stock Suspension, 3550lbs Full Exhaust-- 9.70's@135
66 GTO (Retired race car)
421 CID
Multiple NSCA/NMCA World Champion
66 GTO 389 3x2, 4 speed, 3.90 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
80 Trans Am Black SE Y84 W72 WS6
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