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By Cactus - 17 Years Ago
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Has anyone used leaded racing gas in a street motor to increas the lead content. I realize the octane would be too high to use straight , but I would consider mixing some in.
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By paul2748 - 17 Years Ago
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Seems to me that it would be a waste of money unless you have a ultra high compression engine. If you are worried about the valve seats have them replaced.
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By Y block Billy - 17 Years Ago
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You can use as high an octane as you want, the higher the octane the cooler and slower the flame front which reduces detonation, thats why you can (or should I say have to) use it in higher compression motors and you can use more timing advance. I put LL avgas 100 - 110 octane in mine occasionally (especially when letting the vehicles set for the winter) to keep the system clean. The new gas gums and craps up in no time and smells like varnish in about 2 months time.
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By Hoosier Hurricane - 17 Years Ago
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As an added thought, NASCAR has swithched their fuel to unleaded, so in my opinion, leaded racing gas will disappear from the market when the existing supply is gone. Maybe you should buy a barrel now. I'm sure NASCAR is the biggest user of racing gas in this country. John
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By pegleg - 17 Years Ago
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You can often purchase 100 or 110 octane gas at your local drag strip. Often this will be Torco leaded fuel and is therefore illegal for street use. Torco makes gas for "off road" use 100, 106, 110, and up to 118 octane. They hae a web page with local distributors listed. They also carry an additive that can be added to unleaded gas an is legal for the street, it's easier to handle and store. None of this is cheap though.
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By NewPunkRKR - 17 Years Ago
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What is a good octane to run in these motors? As much as your wallet can handle? I've been running premium - I think 93-94 around here - and I've paid as high as $3.77 a couple weeks ago. Is there any benefit to putting in those 100 / 105 octane boosters you see and hear about? - John
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By LordMrFord - 17 Years Ago
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I have been running with 95 (your 91) for years and cylinder heads looked fine.
Of course with lead addon.
...1.342€/L (6.76$/gallon) in Finland.
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By pegleg - 17 Years Ago
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I run 93 on the street without additives in my F code @ 32 degs, works fine.
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By Hoosier Hurricane - 17 Years Ago
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John: If you are happy with the way your car runs in it's present state, you might try a little 89 and see if it pings. If not, try some 87. No need to pay for octane you don't need. If you only have 4 or 5 gallons of 89 or 87 in it, and it needs more octane, you can top it off with 93 to finish off the low octane stuff. John
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By NewPunkRKR - 17 Years Ago
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I tried to run regular gas for a short period of time when I first got the car running and then the car started to diesel when I turned it off. Since I started running the higher octane again it hasn't happened... But since then I've also tuned the idle mix, because it was running rich. I just wasn't sure if the car would run better or have more power with a little more octane. (again, not so educated in this area - My world of automotive knowledge comes from working on Model's and that's a pretty basic machine) 
- john
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