octane?
 

I have a sbc 355 with 11.5.1 dome pistions,dart heads,lunati 515 lift cam.that i use to have in my drag car,i use to run 110 octane in it with no problem.my question is what is the lowest octane i can in this?i want to be able to run this in car that is street legal.

VP RACING FUEL TOLD ME 110 ON MY 11.30COMP. SBC

IU think hammertime posted this last yr sometime, since he is a VP dealer.

Zip.

Here is a rough recomendation. I have left out the lead count, the aromatic hydrocarbon content and specific gravity. There is also a difference in burning speed, energy value and cooling effect.
PM me if you want it all.

105 octane, CR under 12.5 to 1
108 octane, CR under 14.0 to 1 (75% of all racing engines)
114 octane, high CR and 8500+ rpm (comp cars)
116 octane, high CR and high RPM (ProStock, comp eliminator)
117 octane, Turbo and blown applications

Dave

Re: octane?
 

I ran a 50/50 mixture of 110 and 93 pump gas in a 11.5-1 396 with no problems.

I believe straight 110 is a bit overkill for a 11.5-1 motor, that's what I run in my 13-1 496.

JMO<Cp

Vp red mixed 50/50 pump will work on 11-1comp. mix the 110 50/50 no less than 60/40 and you will be fine. keep total timing to 36* max.

Re: octane?
 

Ran the same 50/50 mix in my 11.5 383. I beleive with aluminum heads you may be able to cheat that down a little more and save a few bucks on fuel...

I built a 11.5: 355 for my 70 Chevy 4X back in 1988, it was my daily driver for 8 years on nothing but 89 octane and 104 booster with 35* total timing. The same engine is still in the truck today, it's tired and only sees action once a month but on days I need to get two cars out to the track I can still drag the open trailer with it.

I ran 105 Octane Avgas in my 11.5:1 Camaro. 496ci with nitrous. No probs.