took this cam out of my car. Need help to identify number on cam is 389410

 

That's a standard GM casting number for Olds cams.

It could be a wide variety of cams.

If it's a GM cam, and it hasn't been reground as something different, the chamfers on the front of the cam may be able to provide information. Take a picture of the front of the cam, with the lighting good enough that the chamfers are clearly visible.

- Eric

 

hope this helps

 

My feeling is that what I'm seeing is a single chamfer going about 300° around, sparing the ~60° starting at the V-shaped notch and continuing clockwise, which would indicate a 400 or 455 M/T cam (except W30) in 1968, '69. and '70 (and maybe some others - I'm not checking everything).
This would be a 1966-'69 393859 or a 1970 406768, and possibly others.

We could be more sure if you could take an evenly lighted photo of the whole face of the cam, straight-on (this picture is taken from an angle toward the short side of the checkmark-cutout and cuts off a portion of the cam).

Here's the Cam ID chart from the '68 CSM:



- Eric

 

this cam came out of my 69 w-30

 

pictures

 

From the 1970 service manual...

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