440 crank question?

[DoubleDlover]

ok. How do you tell a 70 383 from a 70 440 crank?  And is there a regular and hp crank? thanks

[JB400]

 

[1966hemi]

Externally, it is hard to tell the difference between the 2 cranks. The 440 and 383 cranks were made from forged steel. Measure the diameter of the main journals to tell the difference.

[pettybird]

Measure the diameter of the main journals to tell the difference.

This.  440's are larger.

[John_Kunkel]

In '70 the 383 could have a cast crank, 440 is forged. The 440 mains are 2.750" while the 383 are 2.625".

[randy73]

In '70 the 383 could have a cast crank, 440 is forged. The 440 mains are 2.750" while the 383 are 2.625".

70 383 cranks for HP engines are forged, only 2bbl engines got cast.

[GPULLER]

I thought all 383 cranks were forged?

[John_Kunkel]

'70 and '71 383-2 got cast cranks when mated to the automatic...standard shift got forged. The factory Parts Catalog has a note to be sure of type before ordering replacement parts.

[Cooter]

Main bearing measurements are the only way to tell for sure.