CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: LT12NV on July 17, 2008, 04:40:18 AM

Title: Part of suffix code/assembly date cut off under cylinder head....Possible?
Post by: LT12NV on July 17, 2008, 04:40:18 AM: I'm trying to verify authenticity of #'s for a friend on a 69 L78 Camaro....The suffix code/assembly date is partially under the cylinder head...IS the possible?

Was the deck stamped prior to cylinder head installation?

I thought it was done AFTER the engine was completely assembled which would make this block a restamp..Just wondering...Seller swears its a legit stamp.. ???
Title: Re: Part of suffix code/assembly date cut off under cylinder head....Possible?
Post by: firstgenaddict on July 17, 2008, 06:26:01 AM: Big blocks were stamped with the Assembly date and suffix code before the heads were installed... small blacks after...
Title: Re: Part of suffix code/assembly date cut off under cylinder head....Possible?
Post by: JohnZ on July 17, 2008, 05:54:51 PM: Anything is possible, but the gang-stamp holders used at Tonawanda on big-blocks had a tab on them that located over the front edge of the pad to consistently place the stamping on the same place on the pad so it wouldn't be hidden under the cylinder head later. You can see the tab protruding from the bottom edge of the gang holder in the photo below.
Title: Re: Part of suffix code/assembly date cut off under cylinder head....Possible?
Post by: firstgenaddict on July 17, 2008, 06:41:17 PM: Correct me if I am wrong...

The JE would be towards the front of the engine with the cotter key pointing towards the lifter valley... so the tab sticks out the bottom and acts as a stop from the left side of the stamp pad?
Title: Re: Part of suffix code/assembly date cut off under cylinder head....Possible?
Post by: JohnZ on July 18, 2008, 01:47:49 PM: Quote from: firstgenaddict on July 17, 2008, 06:41:17 PM
Correct me if I am wrong...

The JE would be towards the front of the engine with the cotter key pointing towards the lifter valley... so the tab sticks out the bottom and acts as a stop from the left side of the stamp pad?

Yes - as viewed from the front - the tab hangs over the front edge of the pad and prevents the stamp from being located too close to the front of the cylinder head.