[A Snake]

Thought it might be interesting to share this:

Leaded vs unleaded same octane for both. Believe it or not, the unleaded makes just a tiny bit more HP on the dyno.

While I was trying to figure out what my engine liked to drink, I tried several "octane boosters" including one reputed to be the best by the racers. That one was Moroso.

I never did succeed in doing anything but making a mess. The car was hard to start when warm....just like any FE with compression. Octane booster didn't help. What did work was Turbo Blue racing fuel. And this took a little time to clear things out. After a tank of it and a redo on the timing and a fresh set of plugs, the engine ran like a top with it. It started quick, idled right and made lots of power.

When I got back to the Northwest, there was no Turbo Blue to be had, so I started once again to run pump supreme. 92-93 octane. Surprise surprise. I just backed of the timing a couple of degrees and it worked fine. A little harder to start, but not too bad overall.

What I think I learned is that screwing around with the boosters had me so screwed up on my tuning that nothing would have worked.

Long story short....gave up on the boosters long ago.....with 11:1 CR.

Mr. Fixit is on by me. I'd agree with adding a portion of racing fuel to each fill up. I'd suggest about 4:1 or 4 gal pump gas to 1 gal racing fuel. Much less and I don't personally think you'd notice it. That's pretty diluted as it is.