408 dyno test

PRH said
I’m surprised the HP peaked at that low of an rpm.
The TQ peak occurred at what I would consider a pretty normal, and sufficiently high rpm, that I would have expected it to end up making peak HP a little higher.

Any idea which stock heads were used?
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Imo it's timing. Its a big part of that, read about the distributor.

As for the heads..they could flow less than as cast depending on A. Valve job B. The valve job with no blending done @2.02 ...now picture the flow curve...then the low lift cam.