With 8:1 pistons and good tuning... I would shoot for a slightly richer mixture at higher rpms... around 11.5:1.

Anyways, you could probably run 20 psi all day long on pump gas. smile.gif

The guys here run 15 psi on 8.5:1 pistons and 89 octane fuel.

 

those are some nice numbers......holy chit, if only i could get mine up in that area....{wets his pants just thinking about it. well done man.

 

Wow. eek!

Hope it could last long.

 

jesus i need to go take a vacation to puerto rico and check out the tibs down there. my boy's shop and all his brothers keep tellin me about the tibs down there