is 11.2:1 compression too much for 91 Octane

Thanks Clinteg,
so the bore and stroke you mentioned there are based on a stroked 440 (500cui) correct?

I'm just trying to wrap my head around if the car that I'm looking at (that has this engine) will run on the fuel I have available here. Like you mention 91 octane might not be enough (not that we'd know for sure until we try it LOL).

The current owner mentions that the car seems to have some rattling under load, so I assume this is pre-ignition and I'm trying to figure out if It would be possible to tune this out (timing, curve and carb setup) or if something more drastic is needed to make it run on 91 octane.

How much difference would a thicker head gasket make you think, or maybe porting and polishing the heads would make a difference (not sure if this is already done).

I guess the only other way (and probably best way) to reduce compression would be to go with different pistons, but I'm not sure if the current cam would work with anything lower than 11:1.

ha ha, questions, questions, questions LOL.