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Discussion Starter #1
4000 miles on them or about 10 yrs.
im running one step hotter b/c i had carbon issues sitting in parades and shows.
just wondering if they are running too hot or lean for comfort.





 

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1966 Mustang GT Fastback 289 4BBL
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My opinion is that those look pretty good. You've got that nice light brown that appears that everything is burning correctly.
 

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They look good, almost a tad lean.
Do you have a O2 wide band sensor and gauge available to determine your O2 readings?

What gas mileage are you getting?

Do you know what primary jets are in the carb?
 

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Discussion Starter #6
thanks
i thought them to be a tad lean but just was wondering if it was issue or not. im going to install a new set and leave well enough alone

and yes chebby plugs., ive always had had good luck with them.

not the first time i cracked a plug on this car. Fords super tight engineering fitment at its best. lol
 

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They look good. I always bought Autolite, but when I couldn't get them, I'd buy the AC equivalent. That's for copper plugs for these old cars.
 
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