Using full on race fuel, in a street car, yes, i can see it damageing the engine, but i thought we were refering to Higher octain pump fuel.....I know the 76 station by my house sell 100 Octain Street Race fuel as Unleaded....In my old car it ran great, when I tore down the engine to replace the pistons and rings, with forged, (becasue of nitrous and turbo) the combustion chamber was still pristine! I replaced all seals as well in the tear down...none showed any signs of ware.....But thats what i thought by higher octain you were refering to.
Roz