I've been talking at work and thought I would get answers from FABO. What octane gas would you use in a 273 four barrel with mild cam. I'm thinking 93.
Also do I really need an additive to replace the lead that was used in the day?
I'd use at least 91 w/ octane boost. Sometimes its a crap shoot getting quality gas, since gas quality & additives can vary from state to state. Here in Reno, NV, they start adding E85 & oxygenating the fuel around November & it plays havoc on my hemi. If I run 100 unleaded from VP @ $5+ per gal or their leaded 110 ($7.99 gal), I have no problems w/ the fuel boiling at a lower temp & causing vapor lock. I'm about to install the factory return line w/ vapor separator to help & will see if the cr-p Chevron 91 will be ok.
If you can get 93, you'll probably be ok.
