I run 93 octane ethanol free ... if I can find it.
The intake is a Performer so the ports on the intake and heads are the same size.
The valves have been back cut.
Air fuel velocity is through the roof.
I have no detonation problems but like said the over lap of the cam helps that... purple shaft .474
Its a torquey little SOB that's for sure.
The package wasn't built for all out performance but for having a little fun on the streets, burn outs, chrip the gears etc...