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Since its birth in 1990, when the old Chevy 2.0L engine was upgradedwith a stroke increased from 3.15? to 3.46?, the 2.2L powerplant hasbeen upgraded several times: the block has been revised four times andthe head has been changed three times (it was discontinued after 2003, replaced by the 2.2 L Ecotec). Let’s start in 1994 and see ifwe can’t clear up some of the confusion.

In 1994 the 2.2L Chevrolet became the base engine in the S-seriestruck line, replacing the 2.5L Pontiac engines. This presents us withthe 2.2L now being both FWD and RWD, which you would think would meannumerous differences. Actually, that’s not so. GM used two differenthead gaskets through 1997, and in 1998 went to a common head gasket forboth FWD and RWD. Using the incorrect head gasket will result in almostimmediate overheating. The castings made changes in those years butthey followed suit in both FWD and RWD alike.

In 1994, the valve stem diameter went from 8 mm to 7 mm as well asgoing to a roller lifter and assembled camshaft. The FWD requires theuse of a 34.4 mm soft plug in front of the head while the RWD is openand must have the bolt holes drilled and tapped (see below). The 1994motor could have casting number 10112391 or 10112391S that is theservice replacement. This same pattern was followed throughout the 1997production cycle.

In 1998, head c/n 24575507 arrived with a heart-shaped combustionchamber against a D shape. The engine also had smaller 1-1/8? diameterexhaust ports vs. 1-3/8?, and a triangular top of the intake ports vs.a smaller eyebrow top. This version of the GM 2.2L engine – asingle-year configuration – must have an open and drilled EGR port.

Since 1999 to present, cylinder head c/n 24576146 has been used andis basically the same as c/n 24575507 except for crucial long flatbosses that are now between the first two and last two exhaust ports(see illustration below). The latest exhaust manifolds have a balancechannel that runs between ports 1-2 and ports 3-4 that must sealagainst the cylinder head. As you can see, that exhaust manifoldconfiguration assembled against the 507 head would leak.

One last quirk, the 146 head may also be drilled for the EGR port asa service replacement for the 507 head in 1998. All later applicationswould require the use of an EGR block-off plate (GM p/n 24575919) whenused without EGR.

Well, there you have it, clear as a bell. No? Well perhaps the chartincluded on page 30 of this issue will help! Good luck and remember itis always easier to build it right the first time.

2.2L OHV L4 GM, CHEVROLET CYLINDER HEADS























OE PIN #

1994
12363166

1994-’97
12360424

1998
12563766

1999-2002
24577648

OE SUPER #

12360424

     

CASTING #

10112391

10112391S

24575507

24576146

7mm Valve Stem

X

X

X

X

8mm Valve Stem

*

     

Roller Rocker Arm

   

X

X

D Combustion Chamber

X

X

   

Heart Combustion Chamber

 

X

X

 

EGR Drilled w/Bolt Holes

Xc

Xc

Xc

Xc

EGR Not Drilles w/o Bolt Holes

Xc

Xc

Xc

 

Eyebrow Intake Port

Xa

Xa

   

Triangle Intake Port

   

Xa

Xa

Large 1.340? Exh. Ports

X

X

   

Small 1.120? Exh. Ports

   

X

X

Exhaust port balance boss

     

Xd

FWD water port closed with 34.3mm soft plug and no bolt holes

Xb

Xb

   

RWD Water open 34.3mm with 2 mounting bolt holes

 

Xb

   

FWD/RWD Water port open 1-21/64? with two mounting bolt holes

   

Xb

Xb

Lost foam casting

X

X

X

X

* prior to 1994 8mm valves were used

Notes:

  1. letter after X indicates illustration attachment
  2. Intake manifold EGR port on intake side in rear of head, the port goes around the back where EGR valve assembly connects, the channel than goes around on to exhaust ports down other side of head.
  3. #24576146 can be WOW drilled EGR port and bolt bosses, but is the only head that has exhaust manifold port balance boss between front two and rear two exhaust ports; this head w/EGR can be used as a replacement for 24575507
  4. 1998 is a stand alone MY application with heart shape chamber and roller rocker head with open EGR.

Special Note: 1998 applications all required an openEGR port; 1999-2002 are closed EGR, w/exhaust manifold port balancemounting face, (see Illustration D and observe area that arrows arepointing to). #24576146 cylinder head may also have open EGR port andwill retro for 24575507 in 1998, or may be used 1999-2002 with the useof EGR block off plate part # 24575919.

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Roy Berndt
Roy Berndt has decades of machine shop experience. He is the Program Manager for PROFormance Powertrain Products, a PER in Springfield, MO. You can reach Roy at [email protected]