Main >> Engine >> Factory >> Buick 225 V6
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 descendent of this engine, the 231 (3.8L) V6, is used in GM cars
to this day. The modernized and common 231 is a good candidate 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 help prevent
stalling at low speeds. The flywheels used in Buick cars are much
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 Stroke
||3.75" x 3.40"