1981 GMC 1/2 ton

Mailbag: Leaning Out a Rich Condition

J.S. • Saltillo, MS Q: I have some questions concerning my 1981 GMC 1/2 ton truck. It has a 350 that’s bored .040 inches over with flat top pistons, ported and polished LT1 heads, a Lunati Bracket Master II cam, and an Edelbrock RPM intake topped with a Carter AFB 600 cfm carb. This combination

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