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Robert Street

Gasoline Recommendation

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I have a 61 SS Impala and a 62 SS Impala both with 409's and original AFB carbs.  Also have a 61 Impala with a dual carb 348 but is a lower compression engine.  Since these cars are not driven but shown I have always used racing gas and great results. But in my area racing gas is becoming a hassle to get.  I have been using ethanol free in my small engines and boat engines with great results.  Any recommendations about switching to mid grade (91) in these engines.  LL100 avgas is also an option for me.

Robert 

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If 91 is mid grade in your area, what is the highest octane available ? In any case, ethanol free gasoline of whatever highest octane is fine to use in any car which is driven lightly. Octane requirements go up as manifold pressure goes up. If you get on those cars occasionally, fuel accordingly. I gave my 10:1 Cadillacs a dose of 100, or 110 from time to time, and hammered them. They thanked me.  -   Carl 

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93 is the highest in this area, VA, MD, DE, at regular filling stations. What's a filling station you ask?😁

 

Typically 87, 89 and 92/3 at most stations. 91 non-ethanol is at a few stations, just not around DC. Hard to find non-ethanol in areas here that have emissions testing.

 

If you cannot hear ping getting on and off the trailer, you will be fine with low octane non-ethanol fuel.😉

 

 

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We are lucky in central Virginia, we have access to 89 and 93 oct. Non ethanol gas plus 110 oct. tacing gas. Actually we have a speed shop near me that has various octane racing gas. You could probably purchase 10 to 15 gal and it would be enough for the two show cars for a season. If you purchased it in those plastic racing jugs it shouldnt go bad

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Agree, I use 93 plus CD-2 and Sta-Bil in the Judge. Mercs I mix 89 and 93 to get 91.

 

cd2.jpg

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I deal in race gas. Most of the race gas has lead in it.

It is for OFF ROAD only.

OK, I cheat some on that. It works great for storage as it is quite stable. Also good for a treat once in awhile on these oldies.

But BEWARE, if your car has a catalytic converter the leaded  gas (or lead substitutes) will ruin it.

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On 8/13/2019 at 11:35 AM, padgett said:

Mercs I mix 89 and 93 to get 91.

 

Visit a blender pump and it does it for you. Once in a while you see a blender pump on steroids...😉

5 Selection Blender Pump.jpg

 

Most every new station just has 87 and 93 tanks in the ground around here. Midgrade comes form blending at a certain ratio.

Edited by Frank DuVal
Pictures added (see edit history)

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