RE: Metrics first appeared in '82? Uh-uh. 78-88 is the decade of the G-Body. Hate using my old 78 Monte as a reference but it was my first introduction to the weird world of metrics. The chassis and cabin were metric, the engine was half metric and half fractional. Eg, exhaust bolts were 3/8ths NC but the cross bolts and mount to frame bolts for the engine mounts were metric. The clam or shell or upper half of the engine mount was 3/8ths NA fractional.
Nick
Nick