Opening chambers vs dishing pistons?

[Desertjr]

Yep thats pretty much it. I am at 2800' so this thing should run on the 85 octane cougar piss...lol...and still be fine on 87 when I head down do 600'. It may not work out, but at least everyone knows the metal is there to do it! BTW, this was a 720 head off of eBay.

So you did add a valley around the valves?

[Desertjr]

Hey Chris do you think this would clear 87 octane?

.038 quench
50 Ivca
9:1 static
7.9:1 dynamic


That's half the quench area of stock with only .5 more dynamic compression

[SilverXJ]

I can't really answer that. However, it is lower than what I run on midgrade so it may cut it. There are just so many variables that its hard to determine what will run on what octane.