Cylinder pressure? Help.

Fishy, the old school 284 is not a fast rate cam by todays standards, just bigger duration at mid lifts than what was avaialabel in the early 70s.

I know you guys place a lot of faith in Desktop Dyno. I can tell you it is good at plotting trends, but not specific numbers. It is only a trend. The margin of error is more than the differences you are noting in the results. The reason it is like that is it averages a lot of things for the ease of the calcuations. The original version (which I played with a lot back in the mid 90s :) ) didnt have flow numbers, it had "stock, ported, and race ported" for heads...lol. I know it's gotten a lot better, but in terms of cam lobes, it is woefully lacking. That is why the roller profiles pull similar numbers, and even the hydraulic lifter calculations are iffy.

I do not want to be known as a thread killer, so if this was aimed at me, I apologize. It seemed to me there were two identical (or very close) threads posted simultaneously, and it's easier to stay focussed on one.