ya i said more than the engine needs is bad... your engine probly needs a higher octane than 93. By domes i assume you mean cylinder head? What do you have, a banshee? And smaller cylinder head volume means more compression which requires more octane.If you have some good mods it may be better. I through in some 93 with a booster one day because i was lazy to go get 110 and it was sluggish. Maybe it could be the domes but i also run a boost bottle and a pro-cool head with modded pipes with a bore done?
