crankshaft question?

[ir3333]

..was reading Larry Sheppards' mopar performance book last night and in the section on crankshafts it says all '72 and '73 manual transmission 340's received forged crankshafts.
.. correct?

 

[moparlover]

he's probably right, there may have been a few leftovers used in '73 but that would be extremely rare.

looking at the harmonic balancer on a car is a quick way to check what kind of crank it's attached to.

 

[ir3333]

..tx mplover...how do the dampers differ?
..forged narrower or is a part # req'd

 

[moparlover]

there is a picture here:
http://www.forabodiesonly.com/mopar/showthread.php?t=180307

and there will probably be a part number on it that you can look up.

the cast crank balancers have usually some sort of offset/weight etc. on them so they are not neutral balanced.

 

[Snake]

..tx mplover...how do the dampers differ?
..forged narrower or is a part # req'd

Al have you look at that Dart in Pearson yet?

 

[ir3333]

heh Don shhh!..still negotiating.

 

[70aarcuda]

there was a memo published by Chrysler stating as on April xx, 1972, 340 engines would have cast crank..and it outlined the new damper and converter requirements...

Note: In ’72, the cast crankshaft replaced the forged crank in production on April 11,1972 with 340 engine #HM340R-3911-8000. Damper stamped ‘Use with 340 cast crank only’

Maybe Larry did not get that memo....

 

[ir3333]

..well that is exactly why i asked...was hoping for some '72,'73 manual trans.
owner input?
anybody?

 

[OldmanRick]

The memo mentions flywheels also. I believe it was for all engines.......
View attachment 340 bulletin.jpg

Sorry, i can't get it to stay blown up here? The flywheel number listed is #3751163

Pick of the damper... "340 cast crank only" stamping.
View attachment cast.jpg