vbanshee Posted May 21, 2010 Report Share Posted May 21, 2010 i have 19cc domes on my cool head by pro design . pro design said if i run anything under 22cc domes i need to run race fuel? is this true? ive ran it off pump 91 and never had a problem Quote Link to comment Share on other sites More sharing options...
tonyown Posted May 21, 2010 Report Share Posted May 21, 2010 (edited) depends on altitude and mods... if you are really high it may be good... 21cc may be safe at sea level so... Edited May 21, 2010 by tonyown Quote Link to comment Share on other sites More sharing options...
springer Posted May 21, 2010 Report Share Posted May 21, 2010 i'm running 21cc domes with a fresh bore and hittin about 150 psi in each cylinder. I'm running 91 no problem. I was even thinking about droppin to 20cc, but i figured i should leave well enough alone. Quote Link to comment Share on other sites More sharing options...
toytech Posted May 21, 2010 Report Share Posted May 21, 2010 i have 19cc domes on my cool head by pro design . pro design said if i run anything under 22cc domes i need to run race fuel? is this true? ive ran it off pump 91 and never had a problem if your compression is over 160 psi you need race fuel. Quote Link to comment Share on other sites More sharing options...
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