Engine build on the brain
So if I'm bench racing this correct using my parts I could set the pistons down .020 in the hole with .054 head gasket a revised Isa of 68.5 and put me on the edge of pump gas
Am I on the right track?
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Yes, you are on the right track and working the numbers the right way. So that is very good.
I've run 8.3 DCR on iron heads (351C) WITH quench and it was fine on 93 pump premium ('back-in-the-day' gas). If I went from 1000' elevation to sea level I would see the engine get 'touchey' as to octane. And I'd have to limit timing... it did not make me at all unhappy to do that, as I am not drag racing.
I doubt that I ever tuned the thing nearly like YR and AJ have done. I'm actually a bit lazy on that LOL. And I can't say that YR is wrong to de-empahsize the quench factor... I just am not comfortable with NOT doing quench myself; all my builds in this range of DCR have had it and have all been successful in pushing DCR without detonation.
But heck... you have open chamber heads... no quench anyway unless you get some of the quench-dome types from KB or ICON.
Now if you are willing to do like you are thinking and run some higher octane for those times you want to create havoc on the streets, and then detune for pump gas on trips, that works.
Mind sharing the other input numbers that go into your computation of static CR? Piston type and chamber cc's....
