adriver
Blazing Apostle
These are the facts as I know them.
Thanks in advance for sharing your knowledge.
383 was original 1967 auto car that was changed to four speed by someone a long time ago.
I'm sure this is s 1967 383 engine.
I'm swapping in 1977 440 cast crank engine.
I'm guessing the 383 was internal ballanced and I'll need a new fly wheel.
This is what I've found so far.
http://www.forabodiesonly.com/mopar/showthread.php?t=189291&highlight=383+crank+ballanced
(This thread doesn't really help. More about engine build)
and
http://www.moparts.org/Tech/Archive/motor/36.html
All early crankshafts are steel forgings. In 1971 Chrysler used a cast crank in low performance 383 engines. The use of cast iron crankshafts in 440's began in 1972. All cast cranks and certain forged steel cranks are externally balanced. These require the use of specially balanced harmonic dampeners, torque converters and flywheels. The appropriate components must be used to ensure that the reciprocating assembly is in balance. If an internally balanced crank is used with an external balanced converter or dampener (or vise- versa) a severe out of balance condition will occur. Externally balanced crankshafts can be internally balanced by adding a heavy metal called Mallory metal to the crank throws. 440's equipped with 3x2 barrel carbs were also externally balanced to compensate for heavier rods. They require the use of externally balanced dampeners and converters or flywheels.
Thanks in advance for sharing your knowledge.
383 was original 1967 auto car that was changed to four speed by someone a long time ago.
I'm sure this is s 1967 383 engine.
I'm swapping in 1977 440 cast crank engine.
I'm guessing the 383 was internal ballanced and I'll need a new fly wheel.
This is what I've found so far.
http://www.forabodiesonly.com/mopar/showthread.php?t=189291&highlight=383+crank+ballanced
(This thread doesn't really help. More about engine build)
and
http://www.moparts.org/Tech/Archive/motor/36.html
All early crankshafts are steel forgings. In 1971 Chrysler used a cast crank in low performance 383 engines. The use of cast iron crankshafts in 440's began in 1972. All cast cranks and certain forged steel cranks are externally balanced. These require the use of specially balanced harmonic dampeners, torque converters and flywheels. The appropriate components must be used to ensure that the reciprocating assembly is in balance. If an internally balanced crank is used with an external balanced converter or dampener (or vise- versa) a severe out of balance condition will occur. Externally balanced crankshafts can be internally balanced by adding a heavy metal called Mallory metal to the crank throws. 440's equipped with 3x2 barrel carbs were also externally balanced to compensate for heavier rods. They require the use of externally balanced dampeners and converters or flywheels.