The casting numbers for most RB, B, LA heads are found in two
places. On the underside of the head on an intake runner, and under the valve cover on an intake runner.
Casting Number Under
Valve Cover on Intake Runner.
Casting Number on the
Underside of Head on
Intake Runner.
Slant 6 Engine Cylinder Heads Casting Numbers
Casting Number
Engine CID
Year
Intake
Exhaust
2206035
170/225
1962-65
1.62
1.36
2843169
170/198/225
1966-74
1.62
1.36
3698995
198/225
1972
1.62
1.36
3614850
198/225
1972-73
1.62
1.36
LA
Engine Cylinder Heads Casting Numbers
Casting Number
Engine CID
Year
Intake
Exhaust
2465315
273
1964-65
1.78
1.50
2532080
273
1964-65
1.78
1.50
2536178
273
1966
1.78
1.50
2658234
273
1966
1.78
1.50
2658920
273/318
1966-67
1.78
1.50
2843675
273/318
1968-74
1.78
1.50
2268341
318
1962-67
1.84
1.56
2658234
318
1967
1.78
1.50
2843675
318
1968-74
1.78
1.50
3769973
318
1975-83
1.78
1.50
4027163
318
1977-86
1.78
1.50
4027593
318
1977-84
1.78
1.50
4323302
318 Fast Burn
1985-86
1.78
1.50
4323345
318 Police
1983-86
1.78
1.50
2531894
340
1968-70
2.02
1.60
3418915
340TA
1970
2.02
1.60
3418915
340
1971-72
1.88
1.60
3671587
340
1973
1.88
1.60
3418915
360
1970-72
1.88
1.60
3671587
360
1973-74
1.88
1.60
3769974
360
1975-76
1.88
1.60
3671587
360
1976
1.88
1.60
4027569
360
1977-86
1.88
1.60
RB/B Engine Cylinder
Heads Casting Numbers
Casting Number
Engine CID
Year
Intake
Exhaust
4021051
360
1977-86
1.88
1.60
1737637
361
1958-59
1.94
1.60
1944705
361
1958-59
1.94
1.60
1737637
383
1960
1.94
1.60
2206324
361/383/413
1961-62
2.08
1.60
2206924
361/383/413
1961-62
2.08
1.60
2463200
361/383/413
1963
2.08
1.60
2406516
361/383/413/426
1964-67
2.08
1.60
2408520
413
1964
2.08
1.60
2402557
413 - 300J
1963
2.08
1.74
2402286
413/426 Max Wedge
1962-63
2.08
1.88
2463209
426 Max Wedge
1963
2.08
1.88
2406518
426 Max Wedge
1964
2.08
1.88
2406158
383/440
1967
2.08
1.60
2780915
383/440
1967
2.08
1.60
2780915
440HP
1967
2.08
1.74
2843906
383/440
1968-70
2.08
1.74
2951250
440
1968
2.08
1.74
3462346
383/400/440
1971-72
2.08
1.74
3462346
400/440
1973
2.08
1.74
3751213
400/440 Motor Home
1973
2.08
1.74
3769902
400/440
1974
2.08
1.74
3769975
400/440
1975
2.08
1.74
4006452
400/440
1976-78
2.08
1.74
Hemi
Engine Cylinder Heads Casting Numbers
Casting Number
Engine CID
Year
Intake
Exhaust
2468016
426 Hemi
1964
2.25
1.94
2531110
426 Hemi (SS) -
Aluminum
1965
2.25
1.94
2780559
426 Hemi
1966-71
2.25
1.94
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