46,
To be totally honest, I have no idea what size I'm using. All I know is I bought it out LMC for the year that I needed. It fits in the engine bay, so it can't be too wrong!! An educated guess says a single diaphragm booster is what I've got. All things being equal, (and I doubt there would be much real difference), I have a 230 in my truck, but once again I don't see how it wouldn't be able to create enough vacuum.
