422 dyno fail

ir3333 said

Stock iron heads stall out at about .480 lift.I know of quite a few 408's with iron heads that made your numbers. But don't forget 440's made 375 hp.

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His stock iron is ported so those numbers fly out the window for his build.
Your mention of the big block 440 doesn’t help much since it’s bore and stroke are different by a huge margin and it’s cylinder heads are not comparable.