Gents, I have a '40 model 1/2 ton truck which is fitted with a '55 Blue Flame engine. I am wondering what the compression ratio is. I have seen figures ranging from 7.5 to 1, to 8.5 t0 1. I would like to bump it up a bit, fit valve seats for unleaded fuel, etc. Can someone tell what the CR should be, and what I could safely take it up to please? I don't intend to go overboard & make a real hot motor! Mant thanks, Riggles
