What psi do I have to be to use pump gas.
I have 22cc Domes for my Banshee and would like to run 21cc or 20cc Domes

 

From what I have been told, if you have 151 psi or better you had better run racing fuel.

 

like mentioned....as long as you don't over do it with your compression...you should be just fine.
I think you should be able to get away with close to 20cc domes without the use of race fuel.

From what I read on these forum pages...looks like everyone makes the change somewhere around 19cc for race fuel.

 

I've got 20cc domes on my Banshee & run premium unleaded & have had no problem.

 

well from what i have heard/read, 20cc is the border line, you may either run pump or race gas with these domes anything below is race gas material, nythig about is pump gas, if u would use race gas for a 21cc/22cc it is possible to hurt the performance

 

i use 19cc domes on pump gas. i live at 3200 feet and have approx 139lbs of comp cold. talk to an engine builder in your area and he will tell you what to use. i talked with kim muchmore and i havent had a single problem with my setup. i run 2 kns toomey pipes boysen reeds and it runs fantastic at the idaho dunes