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Jeep Engine: Dauntless Buick 225 V6

 Jeep Engines 

287(4.7L) V8
360(5.9L) V8
318(5.2L) V8
242(4.0L) I6
150(2.5L) I4
173(2.8L) V6
GM 151 I4
AMC 401 V8
AMC 360 V8
AMC 304 V8
AMC 258 I6
AMC 232 I6
"Dauntless" 350 V8
"Dauntless" 225 V6
"Vigilante" 327 V8
"Tornado" 230 I6
Perkins 192 I4
"Hurricane" 226 I6
"Hurricane" 134 I4
"Go Devil" 134 I4


Factory Options

The "Dauntless" 225 V6 engine was introduced in 1966 in the CJ and C101 models. The V6 configuration of the engine makes it very compact which is a big plus in tight Jeep engine compartments. Kaiser purchased the tooling to build the 225 from Buick and later, AMC sold the tooling back to Buick.

A desendent of this engine, the 231 (3.8L) V6, is used in GM cars to this day. The modernized and common 231 is a good canidate for replacing a blown 225. There are differences in the balancing of the engine though, so it can be tricky. The 225 is externally balanced and the 231 is internally balanced. This means you cannot just throw your 225 fly wheel on a 231, the 231 must be balanced.

The flywheel itself used with the 225 is not typical. The flywheels used in the Jeep vehicles are very thick and heavy to increase torque. The flywheels used in Buick cars are much lighter.

Since the 225 is a Buick engine, it uses the standard Buick bell housing. The standard Buick bell housing will bolt to a SM420, so this is probably the best transmission swap option for Jeeps equipped with this engine. The T-14 and T-86 3 speed transmissions used behind this engine are not known for their strength.

The Buick 225 uses a cast iron block and cylinder heads with mechanical lifters and 3 main bearings.

Dauntless Buick 225 V6
Bore x Stroke3.75" x 3.40"
Displacement225 (3.68L)
Compression Ratio9.0:1
Horsepower (net)160@4200
Torque (net)235@2400
Main Bearings3
Valve ConfigurationOHV

Last modified Wednesday, 01-Dec-2010 08:33:42 MST

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