When did the hardened valve seats go into production in the slant 6's? I assume around 1970/71 as no lead was becoming available then. But I am not 100% sure.
I'm asking so to know when to worry about ugrading the seats in a rebuild versus not. Tnx!
I'm asking so to know when to worry about ugrading the seats in a rebuild versus not. Tnx!
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