Pontiac Exhaust manifolds have the following casting codes. Note that these are the high performance manifolds only.
Casting
|
Date
|
CID
|
Side
|
Port
|
Notes
|
523539
|
1957
|
347
|
LH
|
D
|
FI
|
524883
|
1957
|
347
|
RH
|
D
|
FI
|
528598
|
1958
|
370
|
LH
|
D
|
FI
|
530374
|
1958
|
370
|
RH
|
D
|
FI
|
530961
|
1958
|
389
|
RH
|
D
|
T395A
|
530965
|
1958
|
389
|
LH
|
D
|
T395A
|
532021
|
1959-60
|
389
|
RH
|
D
|
420A, 425A
|
532216
|
1959-60
|
389
|
LH
|
D
|
420A, 425A
|
535504
|
1960
|
389
|
RH
|
D
|
SD
|
535505
|
1960
|
389
|
LH
|
D
|
SD
|
537454
|
1961-62
|
389
|
RH
|
D
|
425A
|
537455
|
1961-62
|
389
|
LH
|
D
|
425A
|
540297
|
1961-62
|
389
|
RH
|
D
|
SD
|
540297
|
1961-62
|
421
|
RH
|
D
|
SD
|
540298
|
1961-62
|
389
|
LH
|
D
|
SD
|
540298
|
1961-62
|
421
|
LH
|
D
|
SD
|
543053
|
1962
|
421
|
RH
|
D
|
Aluminum SD
|
543054
|
1962
|
421
|
LH
|
D
|
Aluminum SD
|
9772001
|
1963
|
421
|
RH
|
D
|
SD
|
9772002
|
1963
|
421
|
LH
|
D
|
SD
|
9772147
|
1963
|
421
|
RH
|
D
|
NASCAR steel SD
|
9772148
|
1963
|
421
|
LH
|
D
|
NASCAR steel SD
|
9772292
|
1963
|
421
|
LH
|
D
|
SD
|
9772521
|
1963
|
421
|
RH
|
D
|
Aluminum SD
|
9772522
|
1963
|
421
|
LH
|
D
|
Aluminum SD
|
537455
|
1963-64
|
421
|
LH
|
D
|
HO
|
545106
|
1963-64
|
421
|
RH
|
D
|
HO
|
9779493
|
1965-67
|
421
|
RH
|
D
|
HO
|
9779493
|
1965-67
|
428
|
RH
|
D
|
HO
|
9779495
|
1965-67
|
421
|
LH
|
D
|
HO
|
9779495
|
1965-67
|
428
|
LH
|
D
|
HO
|
9777641
|
1967
|
400
|
RH
|
D
|
GTO HO
|
9777646
|
1967
|
400
|
LH
|
D
|
GTO HO
|
9779493
|
1967
|
400
|
RH
|
D
|
Firebird RA
|
9779495
|
1967
|
400
|
LH
|
D
|
Firebird RA
|
9777641
|
1968
|
400
|
RH
|
D
|
GTO RA
|
9779495
|
1968
|
400
|
LH
|
D
|
GTO HO
|
9779495
|
1968
|
400
|
LH
|
D
|
Firebird RA
|
9791607
|
1968
|
400
|
RH
|
D
|
GTO HO
|
9791607
|
1968
|
400
|
RH
|
D
|
Firebird RA
|
9791607
|
1968
|
400
|
LH
|
D
|
GTO RA
|
9791637
|
1968
|
400
|
LH
|
D
|
GTO RA3
|
9794033
|
1968
|
400
|
RH
|
R
|
GTO RA2
|
9794035
|
1968
|
400
|
LH
|
R
|
GTO RA2
|
9794036
|
1968
|
400
|
RH
|
R
|
Firebird RA2
|
9794038
|
1968
|
400
|
LH
|
R
|
Firebird RA2
|
9797072
|
1968
|
400
|
RH
|
D
|
GTO RA3
|
9794035
|
1969
|
400
|
LH
|
R
|
GTO RA4
|
9797038
|
1969
|
400
|
LH
|
R
|
Firebird RA4
|
9797073
|
1969
|
400
|
RH
|
D
|
GTO HO
|
9797073
|
1969
|
400
|
RH
|
D
|
Firebird RA3
|
9797074
|
1969
|
400
|
RH
|
R
|
Firebird RA4
|
9797075
|
1969
|
400
|
RH
|
R
|
GTO RA4
|
9799495
|
1969
|
400
|
LH
|
D
|
GTO HO
|
9799495
|
1969
|
400
|
LH
|
D
|
Firebird RA3
|
478140
|
1970
|
400
|
LH
|
D
|
GTO RA3
|
478140
|
1970
|
400
|
LH
|
D
|
Firebird RA3
|
478141
|
1970
|
400
|
LH
|
R
|
GTO RA4
|
478141
|
1970
|
400
|
LH
|
R
|
Firebird RA4
|
9799720
|
1970
|
400
|
RH
|
D
|
GTO RA3
|
9799720
|
1970
|
400
|
RH
|
D
|
Firebird RA3
|
9799721
|
1970
|
400
|
RH
|
R
|
GTO RA4
|
9799721
|
1970
|
400
|
RH
|
R
|
Firebird RA4
|
478141
|
1971-72
|
455
|
LH
|
R
|
GTO HO
|
478141
|
1971-72
|
455
|
LH
|
R
|
Firebird HO
|
9799721
|
1971-72
|
455
|
RH
|
R
|
GTO HO
|
9799721
|
1971-72
|
455
|
RH
|
R
|
Firebird HO
|
490802
|
1973-74
|
455
|
RH
|
R
|
Firebird SD
|
490803
|
1973-74
|
455
|
LH
|
R
|
Firebird SD
|
Exhaust Manifold Codes
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