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BBC Block Casting Numbers
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Casting Number
|
Size
|
Year
|
Main Bolts
|
Notes
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0-326711
|
|
|
4
|
�Alum., CanAm,
4.44" bores, steel cylinder liners
|
340220
|
427T
|
68-65
|
4
|
|
345014
|
454
|
70-86
|
|
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346236
|
454
|
75-76
|
2
|
|
359070
|
454
|
70-90
|
|
|
361959
|
454
|
73-90
|
2 or 4
|
|
364776
|
427T
|
68-85
|
4
|
|
364779
|
366T
|
68-90
|
4
|
|
399204
|
509
|
70-71
|
4
|
Alum., CanAm, 4.5" bores, steel Cylinder liners
|
399293
|
366T
|
77-78
|
4
|
|
473478
|
427T
|
77-90
|
4
|
|
495102
|
|
|
4
|
Alum., CanAm, 4.5" bores
|
3782870
|
427T
|
68-76
|
4
|
|
3824553
|
366T
|
66-67
|
4
|
|
3855961
|
396
|
65-66
|
2 or 4
|
|
3855961
|
427
|
66
|
2
|
|
3855962
|
396
|
65-66
|
4
|
|
3855977
|
366T
|
66-73
|
4
|
|
3869942
|
427
|
66-67
|
2 or 4
|
|
3902406
|
396
|
67
|
2 or 4
|
|
3904351
|
427
|
67
|
2 or 4
|
|
3904354
|
366T
|
66-76
|
4
|
|
3916319
|
366T
|
68
|
4
|
|
3916321
|
427
|
68
|
2 or 4
|
|
3916323
|
396
|
68
|
2 or 4
|
|
3925521
|
427T
|
68-85
|
4
|
|
3935439
|
427
|
68-69
|
2 or 4
|
|
3935440
|
396
|
68-69
|
2 or 4
|
|
3937724
|
366T
|
68-85
|
4
|
|
3937726
|
427T
|
68-84
|
4
|
|
3946052
|
427
|
69
|
4
|
Alum. ZL-1, Mark IV
|
3946053
|
427
|
97-UP
|
4
|
Alum. ZL-1, 2nd version,
Mark IV
|
3955270
|
427
|
69
|
2 or 4
|
|
3955272
|
396
|
69
|
2 or 4
|
|
3955274
|
366T
|
68-85
|
4
|
|
3955276
|
427T
|
68-73
|
4
|
|
3963512
|
427
|
69
|
2 or 4
|
|
3963512
|
454
|
70-76
|
2 or 4
|
|
3969852
|
366T
|
68-84
|
4
|
|
3969854
|
396
|
69
|
2 or 4
|
|
3969854
|
402
|
70-72
|
2 or 4
|
|
3969858
|
427T
|
68-84
|
4
|
|
3999289
|
454
|
71-79
|
2 or 4
|
Some "CE"
replacement blocks had four bolt main caps
|
3999290
|
396
|
68-69
|
2 or 4
|
Truck
|
3999290
|
402
|
70-72
|
2 or 4
|
Truck
|
3999290
|
402
|
72
|
2 or 4
|
Passanger
|
3999293
|
366T
|
68-90
|
4
|
|
3999294
|
427T
|
68-84
|
4
|
|
10051107
|
454
|
|
4
|
Bowtie, MkIV, 9.8" deck, siamesed
bores, 4.25" semi-finished bores, can be bored to 4.50"
|
10069282
|
366T
|
90-91
|
4
|
Mark IV, Tall deck
|
10069284
|
427T
|
|
4
|
Mark IV, Tall deck
|
10069286
|
454
|
90-91
|
4
|
Mark IV, Short deck
|
10114182
|
454
|
91-UP
|
4
|
Gen.V
|
10114183
|
366T
|
91-UP
|
4
|
Gen.V
|
10114184
|
427T
|
91-UP
|
4
|
Gen.V
|
10134366
|
454T
|
|
4
|
Bowtie, Gen.V, Tall deck
|
10185050
|
454
|
|
4
|
Bowtie, Gen.V, Short deck
|
10237297
|
454
|
96-UP
|
4
|
Vortec 7400", "L-29" Gen.VI
|
10237299
|
427T
|
96-UP
|
4
|
Gen.VI, 7.0L, truck
|
10237300
|
502
|
96-UP
|
4
|
Gen.VI, 4.466"
bore
|
12550312
|
427T
|
96-UP
|
4
|
Gen.VI, 4.250"
bore, fuel pump boss, clutch linkage pivot boss
|
12550313
|
454
|
91-UP
|
4
|
Gen.V crate motor, Gen. VI 4.25" bare block, fuel
pump boss
|
12556110
|
496
|
01-UP
|
4
|
Gen.VII 8.1L, "Vortec 8100", Truck
|
12561357
|
454
|
96-UP
|
4
|
Gen.VI
|
12561358
|
502
|
|
4
|
Gen. VI
|
14015443
|
454
|
87-90
|
2 or 4
|
Mark IV, Truck, Motorhome
|
14015445
|
454
|
78-90
|
2 or 4
|
|
14044807
|
454T
|
|
4
|
Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495"
bores
|
14096859
|
502
|
|
4
|
Gen.V, HO
|
24502504
|
454
|
|
4
|
Bowtie, Gen.V, Race prep, 9.8 "short" deck height
|
24502506
|
454T
|
|
4
|
Bowtie, Gen.V, Race prep, 10.2 "tall" deck height
|
24502572
|
|
|
4
|
4.50" Bore Olds
DRCE 2, 9.5" deck height
|
25534402+A34
|
|
|
4
|
4.590" bore Olds
DRCE 3, 9.25" deck height
|
T = Tall deck,
10.2" deck height 1991 and later Gen.V, VI and VII production BBC motors have one-piece
rear main crank seals.
We would like to thank everyone that has contributed to the data provided on this site. This information has been gathered from several sources and has not been verified.
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