G.M.C. TRUCK
Cyl.
Engine
Bore
Years
Comp.
Ratio
NOTES: Part No.
Sizes
Rings O.E. Assy.
No.
O.E. Casting
No.
Head
Shape
V8-350
5.7L

4.000(IN)
101.6(MM)

CHEVY
ENGINE
1971-96

8.0
Hypereutectic, destroked.020". 3.14" dia. head recess .07" deep with 4 valve reliefs. Use 1986 and earlier rings.

APPROXIMATE HEAD VOLUME=11.5cc

Comp. Ht. 1.540
Pin Dia..9273 Offset
H1476
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3991488
6271097
10159424
12520264
12514101
3991476
6271096
10128212
10144178
V8-350
5.7L

4.000(IN)
101.6(MM)

CHEVY
ENGINE
1986-94

9.0
3.250" dia. head recess .130" deep with two trough valve reliefs.

APPROXIMATE HEAD VOLUME=16.5cc

Comp. Ht. 1.540
Pin Dia..9273 Offset
1487
STD.
.020
.030
.040
.060
2-5/64
1-3/16
Shallow
14093989
10159430
14088933
10144084
V6-351C/M
5.8L

4.562(IN)
115.9(MM)

GMC
ENGINE
1964-72

7.5
3.16" dia. head recess .375" deep. Hollow pin.

APPROXIMATE HEAD VOLUME=24.5cc

Comp. Ht. 2.615
Pin Dia..1.240 Center
5584D
STD.
.020
.030
.040
.060
3-3/32
1-3/16
Iron Top
Groove
2401166
2484686
687203
2365776
2477186
687072
V8-366
6.0L

3.937(IN)
100(MM)

CHEVY
ENGINE
1966-85

8.0
Not destroked. Flat head with one valve relief.

APPROXIMATE HEAD VOLUME=.5cc

Comp. Ht. 2.160
Pin Dia..9898 Center
1435D
STD.
.020
.030
.040
.060
1-3/32
2-5/64
1-3/16
Iron Top
Groove
3886172
10106498
3856253
10106497
V8-366
6.0L

3.937(IN)
100(MM)

CHEVY
ENGINE
1991-93
Hypereutectic, not destroked. .095" dome, one valve relief. Except H5D

Comp. Ht. 2.160
Pin Dia..9898 Center
H3410
STD.
.020
.030
.040
.060
1-3/32
2-5/64
1-3/16
Shallow
Groove
10126748
10101180
V8-366
6.0L

3.9375(IN)
100(MM)

CHEVY
ENGINE
1985-90

8.0
Small
Chamber
9.0
3/32" step head propane pop-up, single valve relief, 1985-90 gas truck, except H5D. Not destroked.

Comp. Ht. 2.160
Pin Dia..9898 Center
1490D
STD.
.020
.030
.040
.060
1-3/32
2-5/64
1-3/16
Iron Top
Groove
10106480
10046482
10108926
10106477
V8-379
6.2L

3.976(IN)
101(MM)

CHEVY
ENGINE
1982-93

20.1
Diesel, Ricardo recess. Minimum clearance cylinders 1 through 6 .0045", cylinders 7 and 8 .0055". Keystone top groove.Same as H1497 below except not hypereutectic and has iron ring.

APPROXIMATE HEAD VOLUME=6cc

Comp. Ht. 2.119
Pin Dia..1.220
1467D
STD.
.5mm
.75mm
1.0mm
1.5mm
Keystone
1-2.0mm
1-4.0mm
Iron Top
Groove
14053377
23500393
23500391
14045106
14079406
14077141
V8-379
6.2L

3.976(IN)
101(MM)

CHEVY
ENGINE
1982-93

20.1
Same as 1467D above except hypereutectic and no iron ring. Diesel, Ricardo recess. Minimum clearance cylinders 1 through 6 .0045", cylinders 7 and 8 .0055". Keystone top groove.

APPROXIMATE HEAD VOLUME=6cc

Comp. Ht. 2.119
Pin Dia..1.220
H1497**
STD.
.5mm
.75mm
1.0mm
1.5mm
Keystone
1-2.0mm
1-4.0mm
14053377
23500393
23500391
14045106
14079406
14077141
V8 395
6.5 L

4.055(IN)
103(MM)

CHEVY
ENGINE
1992-97

Diesel Turbo and Non-Turbo, flat head with Ricardo recess .062" deep. Same as 3421D with ANODIZED HEAD.

Comp. Ht. 2.119
Pin Dia..1.220 Center
3436D*
Std.
.5mm
.75mm
Keystone
1-2.0mm
1-4.0mm

Iron Top
Groove
10183937
12550059
12550061
10163787
10236517
V8 395
6.5 L

4.055(IN)
103(MM)

CHEVY
ENGINE
1992-98

Diesel Turbo and Non-Turbo, HO. Flat head with Ricardo recess .062" deep and full floating pin. Same as 3436D except has no anodized head.

Comp. Ht. 2.119
Pin Dia..1.220 Center
3421D*
Std.
.5mm
.75mm
Keystone
1-2.0mm
1-4.0mm

Iron Top
Groove
10183937
12550059
12550061
10236521
10163787
10236517
* NEW PISTON, AVAILABLE NOW
**NEW PISTON, CHECK FOR AVAILABILITY

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