The AMC 360 was introduced in 1971 in J-series pickups and Wagoneers. It has a cast iron block and cylinder head with over head valves and hydraulic lifters.

In 1971, the AMC 360 have very high rating. I would assume these are gross ratings and the later are net ratings.

In 1972, the 2bbl 360 is more conservatively rated, presumably these are net ratings.

In 1973, an optional 4bbl carburetor was available. The horsepower and torque ratings for this version are significantly better.

The AMC 258 was introduced in 1971 in J-series pickups and Wagoneers and in 1972 in CJs. It continued to be used through 1990 in the Wrangler. It is basically a stroked 232 engine. The great thing about this engine is it reliable, inexpensive, and has horse power and toque peaks at low RPM.

The 258 inline 6 (I6) engine always came from the factory carbureted any many people complain about the Carter BBD carburetor and the maze of emmissions vacuum hoses. There are a couple articles below that can help you sort through those hoses and tune the Carter BBD. For a carbureted engine, the 258 with the Carter BBD performs very well off road. The 258 always came with a cast iron block and cylinder head, hydraulic lifters (with non-adjustable rockers), and 7 main bearings.

The 258 used in '87-'90 Wrangler YJs uses a computer controlled Carter BBD. It is very simlar to the 258 used in '82-'86 CJs, but performance suffers due to emmission controls.

The 258 used in '82-'86 CJs used a computer controled Carter BBD. The computer controls mixture based on an O2 sensor and other sensors.

The 258 used in '79-'81 CJs, some used a 1bbl carb and some used a 2bbl carb.

The 258 used in '72-'78 CJs, J-series pickups, and Wagoneers, some used a 1bbl carb and lower compression than later 258s.

The 258 was introduced in 1971 as the standard engine in J-series pickups and Wagoneers.