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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#23569 04/04/2005 10:55 PM | Joined: Apr 2005 Posts: 1 Junior Member | | Junior Member Joined: Apr 2005 Posts: 1 | Hi. Can unleaded fuel be used in a 1969 250 straight six. The vehicle is a Grumman Olsen Stepvan that I bought here in England in 1978. At the moment I am using a lead replacement additive in the fuel, but was wondering if the engine would be damaged if I was to stop using it? | | |
#23570 04/05/2005 2:03 PM | Joined: Apr 2004 Posts: 37 Junior Member | | Junior Member Joined: Apr 2004 Posts: 37 | I use unleaded in mine said to wear valve seats there are many opinions on how fast the only way to prevent this is with additives or having hardened seats installed in your head and new valves I'm running mine with unleaded and when the time comes I'll have the head redone | | |
#23571 04/05/2005 2:30 PM | Joined: Mar 2001 Posts: 384 Shop Shark | | Shop Shark Joined: Mar 2001 Posts: 384 | I used unleaded in a 250 for years with no ill effects.
Buzz'n Half Dozen
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#23572 04/05/2005 4:33 PM | Joined: Jan 2005 Posts: 35 Junior Member | | Junior Member Joined: Jan 2005 Posts: 35 | Someone credible told me some time ago that if a vehicles engine has at least 50,000 miles on it running leaded gas, that it will be fine without additives if you switch to unleaded. | | |
#23573 04/05/2005 9:58 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | If it was in a car or 1/2 ton pickup I would say you would never have a problem. These step vans pull real hard on an engine. I would use an additive or put on a later model head unless you just run it till it wallers out the seats & than put in hardened seats or use a later model head. 1971 or later. If you need body parts for that grumman I know a good place to get them. Post it if you are interested. I repaired & sold step vans for 35 years. 
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#23574 04/08/2005 3:12 AM | Joined: Jan 2002 Posts: 622 Member | | Member Joined: Jan 2002 Posts: 622 | I wouldn't worry about it.
delete my account and pictures
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