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Feb 15, 2022 | 08:20 AM

wtdoc2

Thread Starter

5th Gear

Joined: Feb 2022

Posts: 5

Likes: 3

From: Fruitland MO

Fuel

New member and new C3 owner. I have purchased a 1968 convertible with a 427. What fuel should I use? Any additives? The car is scheduled to be delivered next week.

Feb 15, 2022 | 09:11 AM

Jebbysan

Dr. Detroit

Joined: Mar 2012

Posts: 10,090

Likes: 4,015

From: New Braunfels Texas

What 427 is it? 390? 435?

Jebby

Feb 15, 2022 | 11:00 AM

wtdoc2

Thread Starter

5th Gear

Joined: Feb 2022

Posts: 5

Likes: 3

From: Fruitland MO

It is the 390

Feb 15, 2022 | 11:07 AM

Jebbysan

Dr. Detroit

Joined: Mar 2012

Posts: 10,090

Likes: 4,015

From: New Braunfels Texas

The 390 should run on Pump 93 if the curve isn't too aggressive and timing not too far advanced.....
Some will tell you to run lead additive but it takes tens and thousands of miles to beat the non-hardened seats in......
I ran my 427/400 on pump 93 with 37 degrees total timing and about 16 initial......it was fine but WOT in 4th at 50-60 mph you could hear a little spark knock.....

Jebby

Feb 15, 2022 | 11:26 AM

Jud Chapin

Race Director

Joined: Sep 2001

Posts: 10,560

Likes: 439

From: Wellington, FL

St. Jude Donor '11 thru '25

Check your local Sunoco station. They generally have 94 octane. See how that works out. Forget about additives...waste of $.

Feb 17, 2022 | 01:03 AM

Dino_'72

Pro

Joined: Aug 2000

Posts: 610

Likes: 167

From: Vancouver B.C.

Try to avoid gas with ethanol. Creates problems with some fuel parts, and if your car sits in storage for an extended period, gas with ethanol goes bad quickly. Also, as mentioned use higher octane fuel.

Feb 17, 2022 | 07:09 AM

Edward Ackley

Racer

Joined: Apr 2019

Posts: 300

Likes: 83

I have 3 vehicles and i never put any ethnol in my tank unless i travel

Feb 17, 2022 | 08:52 AM