[Yarek]

Hi
Do you know what kind of fuel (how many octanes) should be used to 440 with lowered cylinder heads - compression ratio about 10.5:1.
What gasoline was used in standard 440 in the sixties and seventies?

[Ron]

I have a 440 with 10.5:1 compression ratio and I use 92 - 94 Octane gas with good results.