a 400 sbc for street/strip use. I'd like to run
11-1 compression. 91 octane pump fuel won't cut
it here, so I'd like to spike it with 110 leaded
race gas. How well does octane improve as leaded
race fuel is added? I've heard small amounts help
considerably and it is a case of diminishing returns
as the percentage continues to increase. What
do you think?
I have never had a reason to mix pump gas so the answer is
that I do not know. I do think that if you have a true 11:1
that you should purchase the right fuel the first time. It
would seem to me that mixing pump gas based on hearsay might
cost more than purchasing the right fuel or using the 110
to begin with.
I recommend giving Torco or VP a call and see what they recommend.