recommended fuel octane for 1970 Dodge 340?

Asked by Dec 30, 2013 at 02:01 PM about the 1970 Dodge Challenger

Question type: General

What type of fuel is required for 1970 Dodge Challenger 340?

4 Answers


Leaded fuel, but they don't make it anymore. So most muscle car guys put 93/94 octane in and some an off the shelf additive. I know some guys run 87 octane only. Depends on how much driving you do. Check online of some muscle car forums for more opinions.

2 of 2 people found this helpful.

Premium (93+ octane) with a bottle of lead substitute at each fill up. If you have problems with dieseling, and/or pinging use a bottle of octane booster at each fill up as well. That was the regimen I used with my '70 Catalina. It had the V8 400. Worked very well. HTH. -Jim

1 of 1 people found this helpful.

There is leaded gas available in Oregon.......94 octane at select stations. I buy mine currently for $4.73 per gallon....and use it in all my Carb equipped vehicles.....

There is leaded gas available in Oregon.......94 octane at select stations. I buy mine currently for $4.73 per gallon....and use it in all my Carb equipped additives needed.

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