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lead additive

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serai:
I have a '68 automatic 289. Should I add a lead additive to my gasoline?  If so, how much and how often?

Joe AZ 2 PA:
I use unleaded in my 66 and haven't had any issues. Depends on how much and hard you drive it. I use ours as a weekend cruiser. . . . PS: if you tear it down for engine work have hardened exhaust valve seats put in.

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