Broaching
 

Here is a 63 409 engine...untouched...seems they didn't machine or broach them early on like they did later///anyone know when they changed machining ??...this shows it better

http://img.photobucket.com/albums/v1...n64home006.jpg

Re: Broaching
 

So now im really mixed up. https://www.yenko.net/ubbthreads/imag...mlins/cool.gif

Re: Broaching
 

Is this your motor Bob?

Re: Broaching
 

I know that all Corvette blocks have broach marks even back in the '50's...I'd say that block has been machined at some point.

Re: Broaching
 

Yes Sam and it hasn't ever been machined.

Re: Broaching
 

Looks to me like it has been machined.

Re: Broaching
 

I was the first guy to pull the pan off the thing...standard bore,factory pistons...can't see them machining the deck and missing the numbers...never been re-stamped unless it was done in the 60's https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Broaching
 

Could it have been done in the 70's?
I didn't think the circular machines were used until then.

Re: Broaching
 

Could it have required additional machining at the factory, before the numbers were ever put on it?

Re: Broaching
 

Did anyone give a crap about an original stamping on a 409 in the 70's ? I doubt it...you could still get crate 409's then too...pan has never been off until last night !! Unless someone took a 6 inch sanding pad and gave it a cleaning. The "high" spots in the stampings are a bit shiny...