PONTIAC
Cyl.
Engine
Bore		 Years
Comp.
Ratio		 NOTES: Part No.
Sizes		 Rings O.E. Assy.
No.		 O.E. Casting
No.		 Head
Shape
V6-231
3.8L
3.800(IN)
96.5(MM)

BUICK
ENGINE
1976-87

8.0
Non-turbo, destroked .020". 3.05" dia. head recess .235" deep. NOT INTENDED FOR RACE APPLICATIONS.

APPROXIMATE HEAD VOLUME=25.5cc

Comp. Ht. 1.805
Pin Dia..9398 Offset
H1740
STD.
.020
.030
.040
.060
2-5/64
1-3/16
1249538
1257377
25501423
25527178
1394558
25518053
1247241
1255672
25522904
25519456
1231899
25516057
V6-231
3.8L
3.800(IN)
96.5(MM)

BUICK
ENGINE
1988-92

8.5
Destroked .020". 3.10" dia. head recess .25" deep.

APPROXIMATE HEAD VOLUME=25.5cc

Comp. Ht. 1.366
Pin Dia..9054 Offset
1738
STD.
0.5mm
.75mm
1.0mm
2-1.5mm
1-3.0mm

Shallow
Groove
25533087
24501072
25530461
V6-231
3.8L
3.800(IN)
96.5(MM)

BUICK
ENGINE
1993-94
Similar to 1738 except higher compression height and ring pack.

Comp. Ht. 1.446
Pin Dia..9054 Offset
1744**
STD.
0.5mm
.75mm
1.0mm
1-1.2mm
1-1.5mm
1-3.0mm

Shallow
Groove
24502953
25530461
L6-250
4.1L
3.875(IN)
98.4(MM)

CHEVY
ENGINE
1970-76

8.4
3" Diameter "D" head recess .060" deep.

APPROXIMATE HEAD VOLUME=4.5cc

Comp. Ht. 1.640
Pin Dia..9273 Offset
1446
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3886040
3886048
6270033
3874468
3877604
6262805
V6-252
4.1L
3.965(IN)
100.7(MM)

BUICK
ENGINE
1982

8.0
3.913" diameter head recess .256" deep.

APPROXIMATE HEAD VOLUME=28cc

Comp. Ht. 1.808
Pin Dia..9398 Offset
1732
STD.
.020
.030
.040
.060
2-5/64
1-3/16
25505374
25501263
V8-260
4.3L
3.500(IN)
88.9(MM)

OLDSMOBILE
ENGINE
1975-78

7.4
2.35" diameter head recess .165" deep.

APPROXIMATE HEAD VOLUME=11.5cc

Comp. Ht. 1.575
Pin Dia..9805 Offset
1634
STD.
.020
.030
.040
.060
2-5/64
1-3/16
231906
550136
V6-262
4.3L
4.000(IN)
101.6(MM)

CHEVY
ENGINE
1985-95

9.3
3.16" diameter head recess .08" deep with four valve reliefs. Use 1986 and earlier rings.

APPROXIMATE HEAD VOLUME=13cc

Comp. Ht. 1.540
Pin Dia..9273 Offset
3445
STD.
.020
.030
.040
.060
2-5/64
1-3/16
14077948
3991488
10159424
14075651
3991476
10128212
V6-262
4.3L
4.000(IN)
101.6(MM)

CHEVY
ENGINE
1985-95

9.3
Coated skirts. 3.16" diameter head recess .08" deep with four valve reliefs. Use 1986 and earlier rings.

APPROXIMATE HEAD VOLUME=13cc

Comp. Ht. 1.540
Pin Dia..9273 Offset
3445C
STD.
.020
.030
.040
.060
2-5/64
1-3/16
14077948
3991488
10159424
14075651
3991476
10128212
V6-262
4.3L
4.000(IN)
101.6(MM)

CHEVY
ENGINE
1985-95

8.8
9.4
Hypereutectic, destroked .020". 3.14" diameter head recess .07" deep with four valve reliefs. Use 1986 and earlier rings. NOT INTENDED FOR RACING APPLICATIONS.

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
14077948
10159424
3991476
14075651
10128212
* NEW PISTON, AVAILABLE NOW
**NEW PISTON, CHECK FOR AVAILABILITY
Page 81

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