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
V8-427
7.0L
4.250(IN)
108(MM)

CHEVY
ENGINE
1984-93
Not destroked. Off center combustion recess with one valve relief.

APPROXIMATE HEAD VOLUME=9cc

Comp. Ht. 2.160
Pin Dia..9898 Center
3401D
STD.
.020
.030
.040
.060
1-3/32
2-5/64
1-3/16
Iron Top
Groove
10106490
3893251
14087482
10106487
3874816
14084331
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1970-83

9.0
8.2
Flat head with two valve reliefs. Used in either left or right cylinder bank. 1970 full sets only.

APPROXIMATE HEAD VOLUME=2cc

Comp. Ht. 1.627
Pin Dia..9898 Offset
1448
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3976015-6
3993874
353058
340206
3963553-4
3993825
353062
V8 454
7.4 L
4.250(IN)
108(MM)

CHEVY
ENGINE
1970-83

9.0
8.2
Flat head piston with two valve reliefs. Used in either left or right cylinder bank. For 1970 replace in full sets only. Same as 1448 with coated skirt.

APPROXIMATE HEAD VOLUME=2cc

Comp. Ht. 1.627
Pin Dia..9898 Offset
1448C
Std.
.020
.030
.040
.060
2-5/64
1-3/16
3976015-6
3993874
353058
340206
3963553-4
3993825
353062
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1970-83

9.0
8.2
Hypereutectic, destroked .020". Flat head with two valve reliefs. Used in left or right cylinder bank.

APPROXIMATE HEAD VOLUME=2cc

Comp. Ht. 1.627
Pin Dia..9898 Offset
1475H
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3976015-6
3993874
353058
340206
3963553-4
3993825
353062
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1970-83

9.0
8.2
Coated skirts, Hypereutectic, destroked .020". Flat head with two valve reliefs. Used in left or right cylinder bank.

APPROXIMATE HEAD VOLUME=2cc

Comp. Ht. 1.627
Pin Dia..9898 Offset
1475HC
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3976015-6
3993874
353058
340206
3963553-4
3993825
353062
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1984-90

8.9
8.1
Hypereutectic, not destroked. 2.00" dia. head recess .085" deep, with two valve reliefs. Full sets only

APPROXIMATE HEAD VOLUME=5cc

Comp. Ht. 1.647
Pin Dia..9898 Offset
3403H
STD.
.020
.030
.040
.060
2-5/64
1-3/16
10106471
14071100
340209
10106436
14071092
340204
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1984-90

8.9
8.1
Coated skirts. Hypereutectic, not destroked. 2.00" dia. head recess .085" deep, with two valve reliefs. Full sets only

APPROXIMATE HEAD VOLUME=5cc

Comp. Ht. 1.647
Pin Dia..9898 Offset
3403HC
STD.
.020
.030
.040
.060
2-5/64
1-3/16
10106471
14071100
340209
10106436
14071092
340204
V8-454
7.4L
4.250(IN)
108(MM)

CHEVY
ENGINE
1991-95

8.75
Hypereutectic, not destroked. 2.00" dia. head recess .05" deep, two valve reliefs.

APPROXIMATE HEAD VOLUME=5cc

Comp. Ht. 1.627
Pin Dia..9898 Offset
H3408
STD.
.020
.030
.040
.060
2-5/64
1-3/16

Shallow
Groove
12506746
10126746
12522358
10166822
10101178
10166821
V8 454
7.4 L
4.250(IN)
108(MM)

CHEVY
ENGINE
1996-99
Hypereutectic. Flat head with two valve reliefs. Not intended for race applications.

Comp. Ht. 1.627
Pin Dia..9898 Offset
H3440**
Std.
.020
.030
.040
.060
2-5/64
1-3/16
12555794-5-6
10171065
57071255
* NEW PISTON, AVAILABLE NOW
**NEW PISTON, CHECK FOR AVAILABILITY

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