Six Cylinder Engines

[BusaDave9]

“Dauntless” Buick 225
V6 Engine


The Dauntless V6 engine was used in some CJ5's and CJ6's from 1966 to 1971. It is called an “odd fire” V6. It is a 90 degree V6 that is basically a V8 with 2 cylinders removed. Because the crankshaft was not changed to even out the rotation of the cylinders this V6 this engine has a distinctive rumble.
The 225 has 3 main bearings.

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Bore – 3.75 inches
Stroke – 3.4 inches
Compression – 9:1
Horsepower - 160


Information for this post was obtained from Novak's web site

 

[BusaDave9]

Amc 232

AMC 232
Strait Six


When AMC bought Kaiser Jeep in the early '70s AMC made some changes to the CJ model line. The most important change was to lengthen the hood 3 inches in 1972. This was done to install the longer AMC engines. In 1972 the standard engine was the AMC 232. It was available until 1979. The 232 strait 6 produced much less horsepower than the Dauntless V6.
The 232 has 7 main bearings.

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Bore: 3.75"
Stroke: 3.5"
Displacement: 232/3802 (cu in/cc)
Compression Ratio: 8.0:1
Main Bearings: 7
Net Horsepower: 100 @ 3600 rmp
Net Torque: 185lb/ft @ 1800 rpm
Carb: 1bbl
Intake Valves:
Head dia: 1.787"
Lift: 0.372"
Exhaust Valves:
Head dia: 1.406"
Lift: 0.372

 

[BusaDave9]

Amc 258

AMC 258
Strait Six


The AMC 258 was based on the 232. The stroke was increased to bring the displacement to 258 cubic inches. The 258 has a reputation of a strong, torquey, reliable motor. The 258 has 7 main bearings.

AMC 258
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Bore: 3.75 inches
Stroke: 3.9 inches
Compression: 8.3:1 (after '82 compression was 9.2:1)
Bore: 3.75"
Stroke: 3.90"
Displacement: 258/4299 (cu in/cc)
Main Bearings: 7
Net Horsepower: 110 @ 3500 rmp
Net Torque: 195lb/ft @ 2000 rpm
Carb: 1bbl
Intake Valves:
Head dia: 1.787"
Lift: 0.372"
Exhaust Valves:
Head dia: 1.406"
Lift: 0.372