Posted By: 70Runnerdude
440 and 413 steel cranks - 09/16/10 11:35 PM
Is there a difference between a 440 steel crank and a 413 steel crank I have one of each in the garrage and they seem to be the same even the numbers on the crank. Not sure on this one ????
Thanks!
Dave
Posted By: MoparforLife
Re: 440 and 413 steel cranks - 09/16/10 11:42 PM
You will hear a lot of yes they are different in balance but they have been interchanged for years with no hardships.
Posted By: JohnRR
Re: 440 and 413 steel cranks - 09/17/10 12:25 AM
Depends on the year I guess , pics posted of early cranks had an extra chunk of metal on the rod throws. Balance will be different , not sure how much lighter a 413 piston is vs a 440 but there is a very large difference in bore size , .195 .
Posted By: Anonymous
Re: 440 and 413 steel cranks - 09/17/10 12:57 AM
Quote:
Depends on the year I guess, pics posted of early cranks had an extra chunk of metal on the rod throws. Balance will be different , not sure how much lighter a 413 piston is vs a 440 but there is a very large difference in bore size , .195 .
4.32 - 4.1875 = .1325
Early 413 cranks had an extended flange with 8 holes (looks allot like a Hemi crank). The extended flange was engineered to work with cast iron automatics which used no flex plate, the crank bolted directly to the converter. Later 413 cranks (easy to ID because they have 6 bolt holes in the flange) were basically identical to a 440 crank.
Posted By: Anonymous
Re: 440 and 413 steel cranks - 09/17/10 03:14 PM
Quote:
Quote:
Early 413 cranks had...
I never knew that.
Another gem from Scott to add to my BB memory banks.
Actually, ALL pre-62 Mopar V-8 cranks - big and small block; hemi, poly and wedge - had extended, 8-bolt crank flanges that the torque converter bolted directly to, w/o a flex plate.
Here's a pre-62 318 poly crank with extended 8-bolt flange
Posted By: Anonymous
Re: 440 and 413 steel cranks - 09/17/10 03:21 PM
Here's a six-bolt regular-flange 413 forged crank next to a 440 forged crank. I have no idea if the balance is different, but you will notice that every rod throw on the 413 crank (on the left) has a tab on it; the 440 crank has none.
