What gasoline?

[Jerry K.]

Just bought a '66 roadster and was told by the seller to use the highest grade Sunoco gas in it. Any opinions? Also how do you make a seal with the gas pump hose into the gas tank so the gas pump does not keep shutting off?

[Donald T.]

Re: What gasoline?

Just bought a '66 roadster and was told by the seller to use the highest grade Sunoco gas in it. Any opinions? Also how do you make a seal with the gas pump hose into the gas tank so the gas pump does not keep shutting off?

Jerry,

Congratulations on your acquisition! Of course, I'm partial to midyear convertibles. I would recommend you check the archives. You will find extensive information on fuel, additives, and octane. If properly tuned, your car will probably run fine on high octane pump gas. Check the archives for more info that you will ever care to know.

As far as the automatic shut off, I don't use it. I have lacquer paint so I hold a paper towel around the nozzle to ensure gas doesn't get on the paint.

Good luck with the new ride!

Don

[Cathy S.]

Re: What gasoline?

My 66 327/350 runs fine on 91 octane. The auto shutoff valve does not work with our tanks. Just rest one edge of the rubber boot on the tank neck and push down gently, keep an eye on the level and your good to go.

Greg

[Edward S.]

Re: What gasoline?

As stated the other day I have a 65 396/425 in which I always put Sunoco Ultra which in Jersey is 94% and the car runs just fine. It might help if you told everyone what size engine you have in the car?

[John F.]

Re: What gasoline?

I have always run Shell high octane. Started back in the 60's and with whatever additives are in it, it sure keeps the insides of a carb clean. Therefore I would guess the valves, etc. look good as well. Just my $2.65 worth. 327/250

John

[Jerry K.]

Re: What gasoline?

Sorry about that. It's a small block, 327/300.

[Larry M.]

Re: What gasoline?

Jerry:

93 octane premium gas will be fine for this engine unless it has been significantly modified from stock (cam, compression, etc), or the ignition advance curve (initial + centrifugal + vacuum) has been significantly modified.

If either of these has occurred, then you MAY need to blend some av gas or racing gas along with the 93 octane pump gas. Otherwise you should be fine. Check the archives for similar questions from others.

Larry

[Donald L.]

Re: What gasoline?

If you are getting detonation with 327-300 using 93 octane gas perhaps you should check the ignition map.

[Jerry K.]

Re: What gasoline?

Thanks to everyone for the info. No ping or knock with 93, so I'll stay there.

[Joe L.]

Re: What gasoline?

Thanks to everyone for the info. No ping or knock with 93, so I'll stay there.

Jerry-----


Not necessarily the best thing to do. What you want to do is to use the LOWEST octane gasoline that will keep you out of significant pre-ignition or "pinging". You might find that a mid grade, 89 octane will get it done. If so, you won't gain a thing by using a higher octane. If 89 doesn't work, then you might try alternating one fill with 93 and the next with 89 (with the tank half empty for each fill).

Want the best shot at keeping your valves and piston crowns free of deposits? Use only "Top Tier" gasoline. www.toptiergas.com