Dyno - headers

Not all “fenderwell” headers are created equal.

So, what the results of a test between a particular pair of headers on a 450hp SBC does......... has no bearing on what might happen on a different set of headers on a 600hp BBM.
The results might be similar, they might be way different.

The only conclusions that can be drawn from a header swap test on a given engine is........ that’s how those parts worked on that particular engine.

Any trying to correlate that data into another build is just a guess.