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Jeep Engine: GM 151

151 pasenger side

 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

Engines

Upgrades
Factory Options
General


The 151 (2.5L) inline 4 engine was used in '80-'83 CJs including the CJ-8, CJ-7, and CJ-5. The 151 is often called the "Iron Duke", but is actually a Pontiac engine designed to replace the Chevy "Iron Duke" I4 engine. The engine does have the Chevy bell housing bolt pattern though. The engine is manufactured by GM and uses a cast iron block and cylinder head with hydraulic lifters and 5 main bearings. The 151 cetainly is not a screamer, the AMC I4 has much better HP and torque ratings.

The neat part about the engine is it has the same bell housing bolt pattern as a Chevy small block. The bell housing makes a great low buck Ford/Jeep to Chevy adapter since it is basically Ford on the transmission side and Chevy on the engine side. A regular Chevy bell housing will bolt to the 151, so if you plan a transmission swap, a Chevy transmission would be the way to go. Also, a Chevy 305 or 350 will bolt right to the Iron duke bell housing. The down side of dropping in a V8 is most transmissions used with the Iron Duke are light weight units.

The GM 151 has the intake and exhaust manifolds on opposite sides of the cylinder head, but the AMC 150 has the intake and exhaust manifolds on the same side of the cylinder head. The picture at the top of the page is the passenger side with the intake manifold and carb. The drivers side is pictured below with the exhaust manifold removed.

GM 151
Bore x Stroke4.00" x 3.00"
Displacement151 ci(2.5L)
Compression Ratio8.2:1
Horsepower (net)82@4000
Torque (net)125@2600
Main Bearings5
Valve ConfigurationOHV
FuelRochester staged 2bbl

Contributors

Thanks to David Ewing for the manifold identification tip. Thanks to Ed Lowe for keeping my GM engine history straight.

151 drivers side

Last modified Wednesday, 01-Dec-2010 08:33:45 MST


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John Coakley and the Bluesicia (7/25/2013)
I have one in a 1980 CJ why is the exhaust on the orger side?

Dean (10/3/2012)
kansas racing products makes the Super Duty version of the iron duke blocks/heads which is are beefier and more expensive and higher performance than the standard iron duke.

Dean (10/3/2012)
The Jeep iron dukes, and the old vega/monza/nova versions have the SB Chevy bellhousing. The later fwd versions have a different bellhousing, and the S10 (rwd) is the same as the fwd, except the starter is on opposite side.

edward (3/3/2012)
I read that you can still buy that engine new from kansas racing products. Is that correct?

AllenS (2/1/2012)
Does anyone have a service manual for the GM 151 4 cylinder motor? I need to know what to torque the bolts to. And in what sequence. Stuff like that.

scot forrester (8/3/2011)
what is a good replacement carb. for the 152ci.?

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