Big Block Chevy Engine Block Casting Numbers

Big Block Chevy Engine Block Casting Numbers

CASTING#…..SIZE……YEAR….MAIN CAP BOLTS
340220………427T……68-85…4-bolt
345014………454……..70-86
346236………454……..75-76…2-bolt
359070………454……..70-90
361959………454……..73-90…2 or 4 bolt
364776………427T……68-85…4-bolt
364779………366T……68-90…4-bolt
399204………509……..70-71…4-bolt, Alum., CanAm, 4.5″ bores, Cylinder liners
399289………454……..73-79
399293………366T……77-78…4-bolt
473478………427T……77-90…4-bolt
3782870…….427T……68-76…4-bolt
3824553…….366T……66-67…4-bolt
3855961…….396……..65-66…2 or 4 bolt
3855961…….427……..66……..2-bolt
3855962…….396……..65-66…4-bolt
3855977…….366T……66-73…4-bolt
3869942…….427……..66-67…2 or 4 bolt
3902406…….396……..67……..2 or 4 bolt
3904351…….427……..67……..2 or 4 bolt
3904354…….366T……66-76….4-bolt
3916319…….366T……68………4-bolt
3916321…….427……..68………2 or 4 bolt
3916323…….396……..68………2 or 4 bolt
3925521…….427T……68-85…..4-bolt
3935439…….427……..68-69…..2 or 4 bolt
3935440…….396……..68-69…..2 or 4 bolt
3937724…….366T……68-85…..4-bolt
3937726…….427T……68-84…..4-bolt
3946052…….427……..69……….4-bolt, Alum. ZL-1, Mark IV
3946053…….427……..97……….4-bolt, Alum. ZL-1, 2nd version, Mark IV
3955270…….427……..69……….2 or 4 bolt
3955272…….396……..69……….2 or 4 bolt
3955274…….366T……68-85……4-bolt
3955276…….427T……68-73……4-bolt
3963512…….427……..69………..2 or 4 bolt
3963512…….454……..70-76……2 or 4 bolt
3969852…….366T……68-84……4-bolt
3969854…….396……..69………..2 or 4 bolt
3969854…….402……..70-72……2 or 4 bolt
3969858…….427T……68-84……4-bolt
3999289…….454……..72-79……2 or 4 bolt, some “CE” replacement blocks had four bolt main caps
3999290…….396……..68-69……2 or 4 bolt, Truck
3999290…….402……..70-72……2 or 4 bolt, Truck
3999290…….402……..72………..2 or 4 bolt, Passenger
3999293…….366T……68-90…….4-bolt
3999294…….427T……68-84…….4-bolt
10051107…..454…………………..4-bolt, Bowtie, MkIV, 9.8″ deck, siamesed cylinder barrels,
4.25″ semi-finished bores, can be bored to 4.50″
10069282…..366T……90-91……..4-bolt, Mark IV, Tall deck
10069284…..427T………………….4-bolt, Mark IV, Tall deck
10069286…..454……. 90-91……..4-bolt, Mark IV, Short deck
10114182…..454……..91-up……..4-bolt, Gen.V
10114183…..366T……91-up……..4-bolt, Gen.V
10114184…..427T……91-up……..4-bolt, Gen.V
10134366…..454T………………….4-bolt, Bowtie, Gen.V, Tall deck
10185050…..454……………………4-bolt, Bowtie, Gen.V, Short deck
10237297…..454……..96-up……..4-bolt, Vortec 7400″, “L-29″ Gen.VI
10237300…..502……..96-up……..4-bolt, Gen.VI, 4.466″ bore
12550312…..427T……96-up……..4-bolt, Gen.VI, 4.250″ bore, fuel pump boss, clutch linkage pivot boss
12550313…..454……..91-up……..4-bolt, Gen.V crate motor, Gen. VI 4.25″ bare block, fuel pump boss
12556110…..496……..01-up……..4-bolt, Gen.VII 8.1L, “Vortec 8100″, Truck
12561357…..454……..96-up……..4-bolt, Gen.VI
12561358…..502……………………4-bolt, Gen. VI
14015443…..454……..87-90……..2 or 4-bolt, Mark IV, Truck, Motorhome
14015445…..454……..78-90……..2 or 4 bolt
14044807…..454T………………….4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25″ bore or 4.495″ bores
14096859…..502……………………4-bolt, Gen.V, HO
24502504…..454……………………4-bolt, Bowtie, Gen.V, Race prep, 9.8 “short” deck height
24502506…..454T………………….4-bolt, Bowtie, Gen.V, Race prep, 10.2 “tall” deck height
24502572…………………………….4-bolt, 4.5″ bore Olds DRCE 2, 9.5″ deck height
25534402…………………………….4-bolt, 4.590″ bore Olds DRCE 3, 9.25″ deck height