can you look at a picture of my Crank?
 

can you tell from this picture if its a forged or cast crank?

Re: can you look at a picture of my Crank?
 

And you know I looked.

Re: can you look at a picture of my Crank?
 

Lol. Between this thread, and the "how long is your dipstick" thread, who knows what's going on around here :lol:
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Re: can you look at a picture of my Crank?
 

Some folks are just WRONG! ha-ha- What's killing me is the fact that I just had surgery and am pretty much bound to my couch with nothing to do but surf craigslist and read peoples sillyness on here. I did get to peek under hood of a friends truck today. Didn't check out his crank but I did pull his dipstick.

Re: can you look at a picture of my Crank?
 

To me that looks more like a forged one, but I'm no expert

Re: can you look at a picture of my Crank?
 

Its hard to tell from the angle of your picture,
If the portion I have highlighted shows a "seam" thats approx 1/4" wide its a forged steel crank, if the "Seam" is very thin its a cast crank.

Re: can you look at a picture of my Crank?
 

Lol. I think the meds might be making you slap happy
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Re: can you look at a picture of my Crank?
 

Since you have the motor this far apart are you able to see any name stamps or numbers anywhere?
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Re: can you look at a picture of my Crank?
 

I think the question you want to ask would be if your crank is nodular iron or steel. I don't think GM cut any crank shafts from a billet. I am pretty sure most if not all crank shafts are cast from what ever material (nodular iron, steel or some alloy) then forged and/or machined after they are cast. You may be able to buy a crank shaft cut from a billet but it would be way expensive.

If I am wrong someone please let me know.

Re: can you look at a picture of my Crank?
 

i know what billet means, and i never asked if it was a billet crank,

Re: can you look at a picture of my Crank?
 

no

Re: can you look at a picture of my Crank?
 

it looks like a cast parting line on the counterweight (i.e. thinner than a forged one) - but like Livrat said, very hard to tell in this pic. If you were to take a pic from the front - showing the part Livrat highlighted, you might get a more definitive answer. Also, pretty sure factory cranks for trucks are cast - is this yoru stock motor out of the 69? Forged was usually high-end stuff for the high-end musclecars, etc.

Re: can you look at a picture of my Crank?
 

i bought this motor not knowing much about it. from a friend of a friend. deal...
he didnt know it was a 4 bolt main and also didnt know about the little rust spot. im not if i should just run it this way....

Re: can you look at a picture of my Crank?
 

it looks like it at least needs to be honed, if not bored. Do you have the casting numbers off the rear driver's side of the block?

Re: can you look at a picture of my Crank?
 

3970010 casting numbers

Re: can you look at a picture of my Crank?
 

Look on the end of the crankshaft where the flywheel mounts if there is a notch cut in the flange it is a steel crank
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Re: can you look at a picture of my Crank?
 

Here are the crank numbers from my 70 350 and I believe the cank is crass or the crank is cast steel