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#26197 08/26/2003 6:54 AM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | No, I am not certain.
The 1954 shop manual gives .012/intake and .020/exhaust for the 248 and 270.
An old (1972) NAPA/Echlin Tune-Up Specifications book says .012/intake and .012/exhaust for the 270 and 302 (all years).
My guess is that the NAPA manual is wrong and that .012/intake and .020/exhaust are correct.
Maybe someone who knows GMC settings will post them.
Tim | | |
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