I've got a 68 435HP 427 and can't run 92 octane. I live in the Everett, WA area and have found two places that sell 110, but you must purchase it with 5 gal. cans. Since its leaded, it is illegal to run on the road. They sell it for racing. Our course they said once you leave, they don't care what you do with it. It costs $5.00 per gallon. I currently mix 5 gallons with 7 gallons of 93. Runs like a charm. I trailer the car when taking it to shows far away and then carry an extra 5 gallons on the trailer. Muscle Cars love 110.

Mark

Hi Mark,

It sure is great to run these cars like they were originally designed!! I see that you are running over 40% 110 octane, have you tried anything less? I've worked my way down to 25% 110 and I'm running 11:1 compression and it runs great. The math works out well too because I just take the quantity of race fuel added and I multiply by 3 when I go to the gas station for 93 octane.

Just trying to save you a buck!

PS That 427/435 must really be something on 40% race fuel!!!!!!!!!!!!

Rick

I may try your ratio and see how it runs. The reason I use the mixture that I described is that its easy. I have a 12 gallon tank and when its just about empty, then I dump in the 5 gallons of 110 and rush off to the gas station and top it off with 93.

Runs great and since I started using the 110 it runs cooler. In the past I've been having trouble keeping it cool when in a cruise or stop and go traffic. I cleaned out the radiator and drained the coolant. Now I'm running distilled water (ionized) and then dump in a pint of wetter water. The distilled water I've been told will not corrode like regular water will. The wetter water product also helps prefent corrosion. In the Seattle area, we don't really get freezing weather where I have to worry about the block freezing.

Mark

Hi Mark,

If you don't care to get caught up in the math, just keep using the same system you're using but cut down the amount of race fuel you put in that five gallon can by a half gallon each time. Keep this up until you aren't happy with the performance and then go back to the quantity you were using before you went too far.

I used to do the same thing but I got tired of trying to run the tank down to the bottom. Plus, when the wife wants to go for a 60 mile ride she becomes quite annoyed when I tell her that we don't have enough gas and the tank isn't empty enough to put more in!!! Talk about a way to kill off buying toys!! (do the words "why do we have it if we can't drive it" ring a bell with anyone? Never let this happen.) Needless to say I have worked out a better way.

For a 25% mix, multiply the race fuel quantity by 3 for the gallons of 92 octane. For a 33% mix (judging by my understanding of your engine, this is probably your best choice), multiply the race fuel quantity by 2 for the 92 octane (this will make a 98 octane mix).

By the way, do you have 93 octane in your area? And, how far can you possibly drive with a 12 gallon tank??? I have an 18 gallon tank and I still can't make more than 175 miles!

Also, your current mix comes out to 99.5 octane, let me know what you finally end up with.

Best of luck!
Rick

am i the only one that remembers buying Hess 101 octane or sunoco 260 for 35 cent a gallon?

I had a type-o above. Only have 92 in the area. Anyway, I'm going to do some different mixtures and see how low I can go. At the moment, my overheating problems are causing more worry. It doesn't like stop and go traffic. Had to take a diversion Saturday coming home from a show going through Seattle. Should move to Montana. No traffic in Montana!

Mark

At the Corvette show Saturday, they asked me if I wanted to drive to Bowling Green with the group. Told them that I'd pass, as I would be stopping for gas more than driving. Can't figure out why they put such a small tank in the car! Of course I could pull a gasoline tanker behind the C3!

Mark

You might want to start by putting the CORRECT gas tank in the car. An extra 50% ( 6 gallons ) should make quite a difference in mean time between fill-ups