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  unleaded gasoline

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Author Topic:   unleaded gasoline

Posts: 117
From: Florida
Registered: Oct 2001

posted 12-02-2001 09:09 PM     Click Here to See the Profile for beachbum     Edit/Delete Message   Reply w/Quote
Have a question about unleaded gasoline. My 1968 Mustang with a 289 is original as far as I know with about 130,000 miles. When these engines were designed almost all gasoline was leaded with the exception of Amoco white gas. How will the valves and seats hold up without leaded gasoline?

[This message has been edited by beachbum (edited 12-02-2001).]

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Posts: 1060
From: Athens,GA
Registered: Jul 2001

posted 12-02-2001 09:50 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I have been using a set of standard heads now for 6 yrs on my 289 and have not seen or noticed any ill effects from unleaded fuel as of yet..

I discussed this with a head rebuilder awhile back and he said that he only recommends hardened seats for the larger displacement chryslers and chevys.. Take it for what it's worth..

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Posts: 733
From: Demopolis AL
Registered: Jun 99

posted 12-11-2001 11:06 PM     Click Here to See the Profile for 74merc   Click Here to Email 74merc     Edit/Delete Message   Reply w/Quote
my cousin's 68 289 didn't last long...
maybe 20K miles...
he only had 38k on it when he got it...

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Posts: 30756
From: Saco, Maine
Registered: May 99

posted 12-12-2001 11:47 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I used to know a great auto machinist that passed away a few years ago, he had over 50 years in the business and his nickname was 'God' because he could do anything. I remember asking him this question and he told me when unleaded fuel came out everyone said the valve seats and valve faces would wear like crazy. Everyone was sure they'd have valve jobs night and day. But it never happened. The older engines seem to run fine on unleaded. He advised me to use hardened seats if I wanted to, but I could leave them out and not lose any sleep over it.

I still use hardened seats on the exhaust when I get heads done, just to be safe. But if I had an old engine that was running fine, I'd be in no rush to change them.


'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC

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