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SBC Crank Casting Numbers
Small Block Chevy Crankshafts
All crankshafts have a casting number located on one of the rough finished throws or counterweights towards the front of the crank.
Two types of crankshafts are offered, cast nodular iron and forged steel. Since forged cranks are more expensive to produce, they are generally used only in high performance or severe duty (truck) applications.
Forged crankshafts are easily identified vs cast because a forged crank will have a wide parting line running down the length of the crank, while the cast crank has a thin parting line. Some forged cranks are tufftrided, which is a chemical heat treating process that hardens the bearing journal surfaces. When a crank is tufftrided it will have a dull grey color to it. Many cranks used in severe applications are cross-drilled, which helps ensure constant oiling to the main bearings. All tufftrided cranks are cross-drilled. Not all cross-drilled cranks are tufftrided.
Rear Main Seal
Beginning in 1986 all production small block chevy engines used a 1 piece rear main seal. This means the bolt pattern on the end of the crankshaft was reduced to 3.00".
Journal Size
Journal sizes were increased in 1968.
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Rod
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Main
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Displacments
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Small Journal
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2.00
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2.30
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265, 283, 302, 327
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Large Journal
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2.10
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2.450
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262, 267, 302, 305, 327, 350
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| 400 Crank
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2.10
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2.650
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400, "Some pre 86 Bowtie have 2.450" Mains"
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Click on the header to sort.
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Casting Number
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CID
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Year
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Application
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Notes
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1130
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327
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68-69
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Truck
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Large Journal
|
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1130
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327
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68-69
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Pass,Camaro,Chevelle,Nova
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Large Journal
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1130
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307
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68-73
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|
|
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1130
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307
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68-73
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Truck
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|
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1181
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350
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68-76
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|
|
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14088526
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305
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85-89
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Truck
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Cast Iron, One piece
rear main seal
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14088526
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350
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86-89
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Truck
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Cast Iron, One piece
rear main seal
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14088526
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305
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86-89
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Pass,Camaro,Monte Carlo
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Cast Iron, One piece
rear main seal
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14088526
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350
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87-89
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Camaro,Corvette
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Cast Iron, One piece
rear main seal
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14088532
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350
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86-88
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Truck
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Forged,one piece rear main seal
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14088535
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305
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85-89
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Truck
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One Piece Rear Main
Seal
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14088535
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350
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86-89
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Truck
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One Piece Rear Main
Seal
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14088535
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305
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86-89
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Pass,Camaro,Monte Carlo,Malibu
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One Piece Rear Main
Seal
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14088535
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350
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87-88
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Camaro,Corvette
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One Piece Rear Main
Seal
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310514
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350
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75-76
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Truck
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|
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310514
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350
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75-85
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|
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3279
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302
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68-69
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Z/28,Camaro
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Forged,Large Journal,Hi-Perf
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35431
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262
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75-76
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Monza,Nova
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|
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3727449
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283
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57-67
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Forged
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3727449
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265
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55-57
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Pass,Corvette
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Forged
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3734627
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283
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57-65
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Forged
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3734627
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327
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62-67
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Truck
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small journal
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3734627
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327
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64-67
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small journal
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3735236
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265
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55-57
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Forged
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3735236
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265
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56-57
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Truck
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Forged
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3735236
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283
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57-67
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Forged
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3735236
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283
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58-63
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Truck
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Forged
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3735263
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283
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57-63
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Forged
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3735263
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283
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58-62
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Truck
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Forged
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3782680
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327
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62-67
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Truck
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Forged,small journal
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3782680
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327
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62-67
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Truck
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small journal
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3782680
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327
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62-67
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|
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3782680
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327
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62-67
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small journal
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3815822
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265
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55-57
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Pass,Corvette
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Forged
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3815822
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283
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55-67
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Truck
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Forged
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3815822
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283
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55-67
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Forged
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3835236
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283
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57
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Truck
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Forged
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3835236
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283
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57-65
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Forged
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3835236
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283
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57-65
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Forged
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3835266
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265
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56-57
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Pass,Corvette
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Forged
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3835266
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265
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56-57
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Truck
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Forged
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3835266
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283
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57-63
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Truck
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Forged
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3835266
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283
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57-63
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Passenger,Corvette
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Forged
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3849847
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283
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57-65
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Forged
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3849847
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283
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63-67
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Truck
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Cast Iron
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3849847
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283
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64-67
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Cast Iron
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3876764
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283
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64-67
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|
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3876764
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283
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64-67
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|
|
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3876768
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283
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64-67
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|
|
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3876768
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283
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64-67
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Truck
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|
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3892690
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350
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67
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|
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3892690
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350
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67-72
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3892690
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350
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69-85
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Truck
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Forged Large Journal
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3892690
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350
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75-76
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Pass,Camaro,Chevelle Corvette,Nova
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Forged Large Journal
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3911001
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327
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68-69
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Cast Iron,Large Journal
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3911001
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327
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68-69
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Truck
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Cast Iron,Large Journal
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3911001
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307
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68-73
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Cast Iron
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3911001
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307
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68-73
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Truck
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Cast Iron
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3932442
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350
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68-81
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Pass,Camaro,Chevelle Corvette,Nova
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Cast Iron,Large Journal
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3932442
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350
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69-85
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Truck
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Cast Iron,Large Journal
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3932442
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305
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76-85
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Truck
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Cast Iron,Large Journal
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3932442
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305
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76-85
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Cast Iron,Large Journal
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3932442
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267
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79-82
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Cast Iron,Large Journal
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39411182
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350
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69-85
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Truck
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Forged Large Journal
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39411182
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350
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70
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Z/28
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Forged Large Journal
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3941174
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327
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68-69
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Truck
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Cast Iron,Large Journal
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3941174
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327
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68-69
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Cast Iron,Large Journal
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3941174
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307
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68-73
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Cast Iron,Large Journal
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|
3941174
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307
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68-73
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Truck
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Cast Iron,Large Journal
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3941178
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302
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68-69
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Z/83,Camaro
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Forged Large Journal
High Performance
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3949847
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283
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64-67
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Small Journal
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3951529
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400
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70-80
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Cast Iron,externally balanced
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4577
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327
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62-67
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Small Journal
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4577
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327
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62-67
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Truck
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Small Journal
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4672
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327
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68-69
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Truck
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Large Journal
|
|
4672
|
327
|
68-69
|
|
Large Journal
|
|
4672
|
307
|
68-73
|
|
|
|
4672
|
307
|
68-73
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Truck
|
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Small Block Chevy Flywheel Part Numbers
| Part # | DIA. | Teeth | Comments |
3991469 | 14" | 168 | two-piece seal, internally balanced |
3986394 | 14" | 168 | 400 External balance, two-piece seal |
10105832 | 14" | 168 | 86-later, one-piece rear seal, ext. balance |
14085720 | 12.75" | 153 | Lightweight (15 lbs.), nodular iron, two-piece seal, int bal |
14088646 | 12.75" | 153 | 86-up, Lightweight (15 lbs.), nodular iron, one-piece rear seal, ext bal |
14088648 | 14" | 168 | 86-up, one-piece rear seal, ext. balance |
14088650 | 12.75" | 153 | 86-up, one-piece rear seal, ext balance |
10174482 | | | 89-up with six-speed m/t, requires starter (10455709) |
| Common clutch: | 10.4", 11.0", and 11.85". Some flywheels are drilled for two different clutch patterns. |
Small Block Chevy Flexplate Part Numbers
| Part # | DIA. | Teeth | Comments |
471529 | 12.75" | 153 | Two-piece seal blocks, int balance |
471578 | 14" | 168 | 400 ext. bal, two-piece rear seal |
471598 | 14" | 168 | Two-piece seal blocks, internal balance |
10128412 | 12.75" | 153 | 86-up, one-piece rear seal ext. balance |
10128413 | 14" | 168 | 86-up, one-piece seal, extra thick, HD, ext bal |
10128414 | 14" | 168 | 86-96, one-piece rear seal, ext. balance |
14088761 | 14" | 168 | 89-up 350 HO, one-piece rear seal, ext. bal. |
14088765 | 12.75" | 153 | 86-up, one-piece rear seal, ext. bal. |
14088767 | 14" | 168 | 89-up 350 HO, one-piece rear seal, HD, ext. bal |
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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