PONTIAC
Cyl.
Engine
Bore		 Years
Comp.
Ratio		 NOTES: Part No.
Sizes		 Rings O.E. Assy.
No.		 O.E. Casting
No.		 Head
Shape
V8-307
5.0L
3.800(IN)
96.5(MM)

OLDSMOBILE
ENGINE
1981

7.9
2.70" diameter head recess .107" deep.

APPROXIMATE HEAD VOLUME=9cc

Comp. Ht. 1.595
Pin Dia..9805 Offset
1636
STD.
.020
.030
.040
.060
2-5/64
1-3/16
22506658
22504964
V8-307
5.0L
3.800(IN)
96.5(MM)

OLDSMOBILE
ENGINE
1985-90

8.0
Recessed head .270" deep. Broken sets sold from Factory only.

APPROXIMATE HEAD VOLUME=15.5cc

Comp. Ht. 1.605
Pin Dia..9805 Offset
1639LR
STD.
.020
.030
.040
.060
2-5/64
1-3/16
22527479(L)
22527480(R)
22527033
V8-307
5.0L
3.875(IN)
98.4(MM)

CHEVY
ENGINE
1971-72

8.7
Flat head with four valve reliefs.

APPROXOMATE HEAD VOLUME=4cc

Comp. Ht. 1.655
Pin Dia..9273 Offset
1438
STD.
.020
.030
.040
.060
2-5/64
1-3/16
3923294
3911076
V8-350
5.7L
3.800(IN)
96.52(MM)

BUICK
ENGINE
1976-79

8.0
Non-turbo, VIN H. 3.05" diameter head recess .215" deep.

APPROXIMATE HEAD VOLUME=24.5cc

Comp. Ht. 1.805
Pin Dia..9398 Offset
1731
STD.
.020
.030
.040
.060
2-5/64
1-3/16
1249538
25527178
1394558
125377
22501423
25518053
1247241
1255672
25522904
1231899
25516057
25519456
V8-350
5.7L
3.800(IN)
96.5(MM)

BUICK
ENGINE
1976-79

8.0
Non-turbo, VIN H. Hypereutectic, destroked .020". 3.05" diameter head recess .235" deep. NOT INTENDED FOR RACING 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
25527178
1394558
125377
22501423
25518053
1247241
1255672
25522904
1231899
25516057
25519456
V8-350
5.7L
3.875(IN)
98.4(MM)

PONTIAC
ENGINE
1968-77

7.8
VIN P. Flat head with four valve reliefs.

APPROXIMATE HEAD VOLUME=2cc

Comp. Ht. 1.700
Pin Dia..9805 Offset
1520
STD.
.020
.030
.040
.060
2-5/64
1-3/16
9792415
9794465
478809
493165
499054
9790466
9794917
495470
V8-350
5.7L
4.000(IN)
101.6(MM)

CHEVY
ENGINE
1977-81

8.4
VIN L. 3.16" diameter head recess .08" deep. Use 1986 and earlier rings.

APPROXIMATE HEAD VOLUME=13cc

Comp. Ht. 1.540
Pin Dia..9273 Offset
1470
STD.
.020
.030
.040
.060
2-5/64
1-3/16
6271097
3991488
10159424
6271096
3991476
10128212
V8-350
5.7L
4.000(IN)
101.6(MM)

CHEVY
ENGINE
1977-81

8.5
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
6271097
10159424
3991476
6271096
10128212
* NEW PISTON, AVAILABLE NOW
**NEW PISTON, CHECK FOR AVAILABILITY
Page 83

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