need a heads recommendation Compression related.

I lived in every place you listed for at least a year...except Gimli, but my parents live there half the year so I’m there quite a bit.
The only local fuel I have any great luck with is shell premium, I run it in everything except for the newer 5.0 Mustang my wife drives,she just runs regular co-op gas in that thing.
Even in my lawn equipment E87 goes bad in a few months or it gums up the carb jets in no time...I would not dare to even try it in my 9.5 comp 340 with the iron heads.
:thumbsup:
Though I’d like to know what cam you have in it.
The ultimate question, for every street/ strip gear head.
Well, yes. But there is a fundamental problem with that.
Once it is known, there will be someone
(and by that I mean hoards of people)
that will unknowingly, stupidly or daringly exceed the math by pushing the limits. And then ***** about how it is wrong.

The general guide lines put forth by past engineers should not be bent to hard. If you follow what they suggest, all will be fine. While there is more than likely more to extract from a build as suggested, it can backfire in your face like that cartoon Coyote!

A suggestion for everybody, don’t go nuts, follow the manufacturers suggestions.

The altitude at the airport is 654 ft or so , maybe 1000 ft on one of the hills or okc. ???
:thumbsup:
I quoted your post because you (knowingly?) make a excellent point in air pressure and this effects how a engine runs and performs.

THIS, I know you get. But I find it amazing how many miss this or ignore it and freak when there altitude changes in a large way. There due diligence and research was (probably) ill done. Combined with changing quality of fuel... OH boy!

This is were you see the “Suggestions” put for ignored and crying men enter.