Motorhead is right . You shouldn't run more octane than you need.
If, on the other hand, you only need 89 octane, then you need more mods for your engine. For the street, you need the compression and timing that would require 92 octane if you expect to run well.
Rev
__________________
'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
|