∆∆∆ Won't run as efficient but it will run OK.. If you know someone with a lathe than they can turn it down/open up the gasket.... Or you could get a new one.... If you happen to be on the tight side of things, meaning your squish. Than you could get hot spots and end up with detonation ~~~ not good.. The gasket sticking out into the bore won't really have a chance to cool and your fuel won't burn so efficient.. All in all you will prob be OK since these things are so under tuned from the start.. But like as stated above, you may lose some hp.