Do these old 49's require high octane fuel?

Fuel & Fluids - What to feed the beast.

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rustbucket
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Do these old 49's require high octane fuel?

Post by rustbucket » Fri Mar 9th, 2007 12:56

Trying to fire up an old 49 Plymouth, among other issues, I was wondering if it needs higher octane than what is available at the pump these days. I wouldn't think so given the compresion of 7:1, but I have been wrong before.

Any info would be greatly appreciated!

Johnny_S
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Post by Johnny_S » Fri Mar 9th, 2007 6:56

Nope.....unleaded 85 works fine. The flatheads already have hardened seats from the factory. You shouldn't have problems with pinging unless you have timing issues or excessive carbon buildup.

rustbucket
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Joined: Fri Mar 9th, 2007 12:49
Plymouth: No_Plymouth

Post by rustbucket » Sat Mar 10th, 2007 5:49

Thank you much! I got her running after a 12 year nap. I was quite suprised when she fired up, and after a few cough and wheezes, idled fairly smooth.

Johnny_S
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Post by Johnny_S » Mon Sep 8th, 2008 12:58

Anything new to report?

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