CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: rally on March 08, 2012, 12:08:08 PM

Title: Chevy BB cranksahft cast dates?
Post by: rally on March 08, 2012, 12:08:08 PM

Guys do you know if Chevy cast dates on there crankshafts at the foundry? I have a BB crank and it looks like a raised letter 69 near the top of the front throw? Did they do this?

Title: Re: Chevy BB cranksahft cast dates?
Post by: bcmiller on March 14, 2012, 06:29:10 PM

I don't know.  All I ever look for is the casting number.  A date on a crankshaft is not important to me.

Title: Re: Chevy BB cranksahft cast dates?
Post by: rally on March 18, 2012, 02:21:09 AM

but important to me fella.

Title: Re: Chevy BB cranksahft cast dates?
Post by: bcmiller on March 19, 2012, 12:53:37 AM

Why?  When is the last time you had to pull the pan at a show to have them verify the crankshaft was correctly dated for your car?

It may have a casting date if it is a cast crank.  See this link for where to look.
http://www.chevytech.com/2c50o6.html

Some may have a forging date, but I am not sure on that.

Title: Re: Chevy BB cranksahft cast dates?
Post by: JohnZ on March 19, 2012, 04:49:04 PM

Quote from: bcmiller on March 19, 2012, 12:53:37 AM

Some may have a forging date, but I am not sure on that.

Forgings weren't dated, although many had a code adjacent to the forging number that identified the set of forging dies used to make the part.

Title: Re: Chevy BB cranksahft cast dates?
Post by: bcmiller on March 19, 2012, 09:19:54 PM

Thanks for clarifying that John.

Title: Re: Chevy BB cranksahft cast dates?
Post by: z10kl on March 24, 2012, 10:19:58 PM

This looks like a date to me.(http://thumb17.webshots.net/t/90/90/8/22/28/2631822280107397037hzbfiz_th.jpg) (http://rides.webshots.com/photo/2631822280107397037hzbfiz)

Title: Re: Chevy BB cranksahft cast dates?
Post by: JohnZ on March 24, 2012, 11:41:45 PM

Quote from: z10kl on March 24, 2012, 10:19:58 PM

This looks like a date to me.

Yes, it is - that's a cast crank.

Title: Re: Chevy BB cranksahft cast dates?
Post by: z10kl on March 25, 2012, 12:13:37 AM

My bad. I thought he was asking about big block cranks in general.