422 dyno fail

Brooks James said

If you were hoping for bigger numbers, based on 340 to 422, I saw a Dyno test where a 360 mag was stroked to 408, stroker kit only, all else the same. it only raised the hp 34 hp. Loosely, using a ratio, 340 to 422 would give about 54 hp. Put a 150 shot of nitrous on it.

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I recently did this very thing went from 360 to 418.
swapped headers, cam, intake, carb, convertor, trans, etc over from 360 to 418
only difference was the 418 had more compression.
went from 11.26 to 10.77 ET. Half a second is a lot.
that is a whole bunch more than 34 horsepower.
I talked to Ken Hensley years ago about this( owner of Hensley performance, well known Mopar engine shop), and he said, all things being the same, he sees 3 to 4 tenths in ET going to the stroker. I have found that to be true in several combinations.
I suspect my 5 tenths in this case was the extra compression.