BBC Crankshaft Part Numbers

Casting    #Year    CID    Comments/Specs/RPO's/Apps

330570              427    truck,1053,forging number 6223

336782     1970-74  454    with automatic transmission

3879621    1967     427    L-88, See Note 1

3882841    1965-71  396    See Note 2

3882842    1965-69  427    forged, cross drilled, balanced for 11:1 CR

3882849    1966-69  427

3887114    1965     396    tufftrided, 5140

3963521             454    4 in stroke, 5140, raw forged

3963523    1970-71  454    LS-6, See Note 3

3963524    1970-71  454    LS-7, See Note 4

3965746    1965-69  430    raw forged, semi finished, 3.4-3.8 stroke

3965753    1970-72  495    raw forged, semi finished, 3.9-4.25 stroke, 5140

3967811    1968-69  427    L-88/ZL-1, See Note 5

3975945    1970     454    with manual transmission

3993804             427    raw forged, 3.75 stroke, 5140

3993878    1971-72  454    LS-610051169454raw forged, 4340, 3.75-4.25

Note 1: L-88, with 3/8 in bolt rods, balanced for 12.5:1 CR, tufftrided, cross drilled

Note 2: forged, cross drilled, 3.76 stroke, tufftrided, balanced for 11:1 CR

Note 3: 1053, tufftrided, cross drilled, balanced for 9.25:1 or 11.25:1 CR, forging number - 3520 and 7416

Note 4: 4 in stroke, HD, 5140, LS-7, balanced for 12.5:1 CR, tufftrided, cross drilled

Note 5: tufftrided, 5140, with 7/16 in bolt rods, tufftrided, cross drilled, forging number - 7115