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The Jeep Comanche came out in 1987 with a AMC 4.0L in line 6 cylinder engine. This engine is a perfect fit for the 1986 Comanche. My 1986 4x4 was originally shipped with a Renault Diesel engine. The engine was pulled and replaced with the 1987 AMC 4.0L in line 6 which is still running at 260 000KM. These engines can be picked up for anything from $200 - $2000. But why not sell your Comanche and buy a 4.0L in line 6 with 4x4.
Yes
1986 to 1991
It sure will, as long as the engines are the same
Yes
a Chevy 350 small block will fit into a 86 jeep comanche with some modifications. -A 350 small block will fit in a 86 comanche without modification just be prepared for a lot of work beacuse when you do that the ENTIRE driveline needs replaced all the way back to the knuckles on the u joints at the differentials. you will also need to adjust the motor mounts. but nothing significant.
Yes
1970-1986 should fit
A ? to 1986 4.2 Jeep CJ-7.
Yes, it should work, as long as the engines are the same
No, the engines are different
Yes