zeker van? op wikipedia staat dat ze de 4L in '87 voor het eerst in productiewagens hebben gemonteerd...
The 242 cu in (4 L) engine was developed by AMC in just 26 months using many off the shelf components while featuring, among others, additional strength, improved combustion chamber, port setup, and cam profile.[12] The total weight of the new engine was 483 pounds (219.1 kg), only one pound more than the 258 six despite its heavier components and parts.[12] For example, the cast aluminum valve cover featured 15 bolts, the industry's most, to achieve a positive seal.[12]
The new engine, which was introduced in 1986 for the 1987 model year, was a further evolution of AMC's 258 six.[13] It had a 3.875 in (98.4 mm) bore and a 3.414 in (86.7 mm) stroke giving it a displacement of 241.6 cu in (3,959 cc).[14] Connecting rod length was 6.125" - similar to the discontinued 199 which was phased out in 1970.
The 4.0 is one of AMC's best-known engines.[15] It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 is regarded as one of the best Chrysler 4x4 off-road engines.[16] A Motor Trend long-term test of a 1997 Cherokee XJ noted "this long-lived OHV powerplant has a reputation for getting people where they need to go" as well as "much love expressed by owners for the torquey 4.0-liter/190-horsepower inline six."[17] The engine is known for longevity, and can sometimes go more than 300,000 miles (482,803 km) without rebuilding.[18][19] There are many aftermarket parts available.[20]