Iron Duke carburetor

[craveman85]

Have any of you guys used carbs besides the Weber's on the GM 151 gm engines? I was thinking maybe the smaller sized autolite 2100s would work. Or is there something better I should use.

 

[Posi]

What's wrong with the stock carb? The Rochester is a great carb.

 

[craveman85]

No longer have it. And I'm upgrading the cam and a header as well.

 

[craveman85]

Had a Weber on it before I tore it down for a rebuild. Never could get it running 100% neither can my friend with his.

 

[Manic Mechanic]

The Iron Duke Pontiac engine VIN code A (also called the 2500, GM 151 , Pontiac 2.5, and Tech IV, though the decal on the air filter assemblies actually reads "4 Tech") is a 2.5 L (AMC 150 .8 cu in) I4 piston engine. All Iron Dukes were built by Pontiac beginning in 1977 and ending in 1993. After this time, the GM 2.2 L OHV 4-cylinder replaced it across the entire lineup of vehicles that offered it. This engine is not to be confused with the Chevrolet 153. Early Iron Dukes had a Chevrolet V8 bellhousing (also shared with its third generation inline six) instead of the Buick-Oldsmobile-Pontiac bellhousing bolt pattern until the early 1980s when the later versions were installed in FWD applications where the 2.8L bellhousing bolt pattern was phased in. Cylinder head design had the intake manifold mounted on the passenger side, and the exhaust manifold on the driver side.

This GM 151 was also used by American Motors (AMC) starting in 1980, as the base engine option in the RWD Spirit and Concord, and continuing in both cars through 1982. The AWD (4x4) Eagle carried the GM 151 as standard equipment for 1981, and carried it midway through the 1983 model year. It was also available (as the Hurricane) in economy model Jeep CJs. When coupled to a Chrysler Torqueflite Transmission a special version of the TF904 with a Chevrolet V8 bellhousing was manufactured when optioned with AMC/Jeep vehicles; this also holds true with the manual Transmission bellhousings. AMC replaced the Iron Duke 2.5L I4 with a 150cid Inline-4 derived from their own six.

if this is indeed the motor u have (iron duke) find a 1990 grandam or equivalent and take the throttle body off of it. this way u can have fuel injection with little effort and cost

https://www.thirdgen.org/forums/attachments/tbi/105148d1129669047-tbi-my-duke-no-dcao0276.jpg

 

[craveman85]

Won't be putting efi in it. I like to keep them period correct so it's staying carb.

 

[Manic Mechanic]

Won't be putting efi in it. I like to keep them period correct so it's staying carb.

fair enough just thought id give u an option however if u search for earlier iron dukes by pontiac u may have a better chance finding a carb that works better for that motor and will remain period correct

 

[craveman85]

The other ones I found were all the Rochester computer controlled one. A 2100 could be found in junkyards back in 81 so I thought I'd try that route if possible.

 

[Posi]

The early to mid 80s Chevy s-10 had a non-computer Rochester.

 

[Manic Mechanic]

The other ones I found were all the Rochester computer controlled one. A 2100 could be found in junkyards back in 81 so I thought I'd try that route if possible.

if its a 2100 u want thats what i run in my AMC 258 i6 / 4.2l they r good carbs and easy to find and work on