big block crank

[MidMichiganMudRun]

I have a crank and i know what it is but i cant find it online any where using the numbers stamped in it.... can you help me ??

got a few numbers on it first not really a number but letters.... it has KC with a circle around it stamped on it....
also has 8A01 Stamped on it and it has A08001264

[old school truck dude]

Chevrolet crankshafts fall into one of a number of catagories,big,small block,large and small journal,cast or forged,internally or externally balanced,round or two piece rear main seal.

The casting numbers on the Chevy cranks can be confusing to say the least.Forged crankshafts have less prominent numbers than cast-iron,that comes from the fact that the numbers are not cast into forged cranks.It can be very confusing as to how many numbers are actually on the crankshaft itself,quite often,only the last four digits show up! The number 3941178 Crank might be described by collectors as "1178"

Casting numbers on the crankshaft itself will obvoiusly I.D. it's application but,other features should be checked out at the same time. Be sure to look at the parting line on the crank.Cast cranks have a narrow parting line where the two pieces came together in the mold.Forged cranks have a much wider parting line giving the appearence that the line was ground off.Forged cranks are stronger by far than cast and were used in most of the high performance applications.

Something else to make a note of is weather or not the crank is internally or externally balanced.Externally balanced cranks are used in engines that do not have enough counter balance weight inside the block.The 400 small block and the 454 big block Chevy engines are the only ones from the factory that require external balancing.Requiring the use of balanced flywheels as well as harmonic balancers.

Early 1968 marked the enlargement of the small block crank journals,hence,small journal cranks are pre 68 and large journal cranks are post 68.

Crankshaft Date Castings.

Date codes I.D. the month ,year, and the day that the product was manufactured.A letter would indicate the month while numbers indicate the day & year.The year code can sometimes cause some problems because you will not always be able to I.D. the correct decade.Meaning an 8 could be 68 or 78.****Casting numbers are not always visible on the cranks.****

Example:C238
C=March
23=23 rd day
8=1968 or 1978

Month Codes
A=January
B=February
C=March
D=April
E=May
F=June
G=July
H=August
I=September
J=October
K=November
L=December


Casting #    CID    Year    Application    Comments
1130    327    68-69    Truck    Large Journal
1130    327    68-69    Pass,Camaro,Chevelle,Nova    Large Journal
1130    307    68-73    
   
1130    307    68-73    Truck    
1181    350    68-76    
   
14088526    305    85-89    Truck    Cast Iron, One piece rear main seal
14088526    350    86-89    Truck    Cast Iron, One piece rear main seal
14088526    305    86-89    Pass,Camaro,Monte Carlo    Cast Iron, One piece rear main seal
14088526    350    87-89    Camaro,Corvette    Cast Iron, One piece rear main seal
14088532    350    86-88    Truck    Forged,one piece rear main seal
14088535    305    85-89    Truck    One Piece Rear Main Seal
14088535    350    86-89    Truck    One Piece Rear Main Seal
14088535    305    86-89    Pass,Camaro,Monte Carlo,Malibu    One Piece Rear Main Seal
14088535    350    87-88    Camaro,Corvette    One Piece Rear Main Seal
310514    350    75-76    Truck    
310514    350    75-85    
   
3279    302    68-69    Z/28,Camaro    Forged,Large Journal,Hi-Perf
35431    262    75-76    Monza,Nova    
3727449    283    57-67    
   Forged
3727449    265    55-57    Pass,Corvette    Forged
3734627    283    57-65    
   Forged
3734627    327    62-67    Truck    small journal
3734627    327    64-67    
   small journal
3735236    265    55-57    
   Forged
3735236    265    56-57    Truck    Forged
3735236    283    57-67    
   Forged
3735236    283    58-63    Truck    Forged
3735263    283    57-63    
   Forged
3735263    283    58-62    Truck    Forged
3782680    327    62-67    Truck    Forged,small journal
3782680    327    62-67    Truck    small journal
3782680    327    62-67    
   
3782680    327    62-67    
   small journal
3815822    265    55-57    Pass,Corvette    Forged
3815822    283    55-67    Truck    Forged
3815822    283    55-67    
   Forged
3835236    283    57    Truck    Forged
3835236    283    57-65    
   Forged
3835236    283    57-65    
   Forged
3835266    265    56-57    Pass,Corvette    Forged
3835266    265    56-57    Truck    Forged
3835266    283    57-63    Truck    Forged
3835266    283    57-63    Passenger,Corvette    Forged
3849847    283    57-65    
   Forged
3849847    283    63-67    Truck    Cast Iron
3849847    283    64-67    
   Cast Iron
3876764    283    64-67    
   
3876764    283    64-67    
   
3876768    283    64-67    
   
3876768    283    64-67    Truck    
3892690    350    67    
   
3892690    350    67-72    
   
3892690    350    69-85    Truck    Forged Large Journal
3892690    350    75-76    Pass,Camaro,Chevelle Corvette,Nova    Forged Large Journal
3911001    327    68-69    
   Cast Iron,Large Journal
3911001    327    68-69    Truck    Cast Iron,Large Journal
3911001    307    68-73    
   Cast Iron
3911001    307    68-73    Truck    Cast Iron
3932442    350    68-81    Pass,Camaro,Chevelle Corvette,Nova    Cast Iron,Large Journal
3932442    350    69-85    Truck    Cast Iron,Large Journal
3932442    305    76-85    Truck    Cast Iron,Large Journal
3932442    305    76-85    
   Cast Iron,Large Journal
3932442    267    79-82    
   Cast Iron,Large Journal
39411182    350    69-85    Truck    Forged Large Journal
39411182    350    70    Z/28    Forged Large Journal
3941174    327    68-69    Truck    Cast Iron,Large Journal
3941174    327    68-69    
   Cast Iron,Large Journal
3941174    307    68-73    
   Cast Iron,Large Journal
3941174    307    68-73    Truck    Cast Iron,Large Journal
3941178    302    68-69    Z/83,Camaro    Forged Large Journal High Performance
3949847    283    64-67    
   Small Journal
3951529    400    70-80    
   Cast Iron,externally balanced
4577    327    62-67    
   Small Journal
4577    327    62-67    Truck    Small Journal
4672    327    68-69    Truck    Large Journal
4672    327    68-69    
   Large Journal
4672    307    68-73    
   
4672    307    68-73    Truck    

Next to be added are the big block chevy crankshaft numbers as time permits
Casting #    CID    Year    Application    Comments
3521    454    70-76    Chevelle,Monte Carlo    Forged,LS5,LS6,& High Perf
3521    454    70-88    Truck    Forger,Heavy DutY
353039    454    70-76    Passenger,Chevelle    Cast Iron,LS4,LS5
353039    454    73-88    Truck    Cast Iron
3732692    348    58    Passenger    Auto,Manual Trans
3633223    409    62-65    Passenger    
3733226    348    58    Passenger    
3741640    348    59-61    Passenger    Manual Trans
3741642    348    59-61    Passenger    Auto Trans
3788072    409    61    All    
3795589    409    61-62    All    
3804816    396    65-69    
   
3804816    427    66-69    
   
3804816    366    66-76    Truck    
3804816    396    68-72    Truck    
3804816    427    68-72    Truck    
3804816    400,402    70-72    Pass,Camaro,Chevelle Monte Carlo,Nova    70 was only Nova
3804816    400,402    70-72    Truck    
3815822    348    58-61    Passenger    Manual Trans
3824553    348    58-61    Passenger    Auto Trans
3829027    409    63    ALL EXC Z11    All Tans
3837466    409    63    Z11    Special Hi-Perf
3838416    409    64-65    Passenger    All Trans
3856223    396    65-69    
   
3856223    402    70-71    
   
3863144    396,402    68-72    Truck    
3863144    366    68-85    Truck    
3863144    400,402    70-72    
   
3874874    396,427    66-69    
   
3874874    396/402    68-72    Truck    
3874874    366    68-85    Truck    
3874874    400,402    70-76    
   
3882842    366,396,427    
   
   
3882842    366,396,427    
   
   
3904815    396    65-70    
   
3904815    427    66-69    
   
3904815    366    66-76    Truck    
3904815    396    68-72    Truck    
3904815    427    68-76    Truck    
3904815    400,402    70-72    Truck    
3904815    400,402    70-76    
   
3963524    454    70-72    Truck    Forged
3963524    454    70-72    
   Forged
3967416    454    70-71    
   
3967463    454    70-72    Truck    Forged
3967463    454    70-72    Pass,Chevelle,Corvette MOnte Carlo    Forged
3967463    454    73-86    Pass,Chevelle,Corvette    Forged
3967463    454    73-88    Truck    Forged
6223    427    66-69    
   Forged,hi-perf
6223    396    66-70    
   
6223    366    66-85    Truck    
6223    396,402    68-72    
   
6223    396    68-72    Truck    
6223    427    68-76    Truck    
6223    400,402    70-72    Truck    
6223    400,402    70-76    Truck    
7115    396    65-69    
   
7115    366    66-68    Truck    
7115    427    66-69    
   
7115    427    68    Truck    
7115    396    68-72    Truck    
7115    400,402    70-72    Truck    
7115    400,402    70-76    
   
7416    454    70-72    Truck    Forged,Heavy Duty
7416    454    70-72    Chevelle,Corvette    Forged,Special Hi-Perf
7416    454    73-76    Chevelle,Corvette Monte Carlo    Forged,LS5
7416    454    73-88    Truck    Forged,Heavy Duty

[MidMichiganMudRun]

Ok cool thanks for the website info... But non of which helps with my crank... The numbers i have posted are the only numbers on the crank... And there stamped in not forged

[old school truck dude]

It says the numbers aint always on the crank.. That stamp is most likely an id for some machine shop.. Probably have to take it to a machine shop and have them mike it out, they usually chuck them up on the lathe to measure crank throw accurately.. check mains and rod journals see if its turned down.. the sound of it ringing tells you if its cast or steel..

[old school truck dude]

Maybe thats a date, 8 january 2001