Editing Chrysler Slant-6 engine (section)

==Significant production changes==
* The combustion chamber shape was slightly modified for 1967 to promote more complete combustion and reduce exhaust emission toxicity.
* All G engines used [[forge]]d [[steel]] crankshafts until the middle of model year 1976, when a less costly [[cast-iron]] crankshaft was introduced. The cast crankshaft uses a different block, different main and connecting rod bearings and different connecting rods.
* The counterbore in the rear flange of the crankshaft was {{convert|1+1/4|in}} diameter until 1967. For 1968, it was enlarged to {{convert|1+1/2|in}}. This difference has implications when swapping engines with [[automatic transmission]]s.
* All G-engines used solid valve [[tappet|lifters]] through the 1980 model year, with the exception of a small production test of [[hydraulic lifters]] in the 1978 model year. For model year 1981, all North American G-engines received top-fed hydraulic lifters. Retrofitment in both directions is possible.
* Emission control devices and systems, carburetor make and specification, and engine assembly details changed over the years to comply with market requirements and preferences.
* [[Electronic ignition]], which had been made available on [[V8 engine]]s late in 1971, was made standard equipment on all engines including the RG in 1973.
* [[Induction heating|Induction]]-[[hardening (metallurgy)|hardened]] exhaust valve seats and upgraded exhaust valves were made standard in 1973 to withstand prolonged operation on [[unleaded gasoline|no-lead fuel]].