CRG Discussion Forum

Camaro Research Group Discussion => Decoding/Numbers => Topic started by: aus67rs on September 16, 2020, 12:23:51 PM

Title: Exhaust Manifold Casting Number Orientation
Post by: aus67rs on September 16, 2020, 12:23:51 PM

Hi All,

I have recently purchased a LH exhaust manifold to replace my original one which had been repaired previously.  The replacement appears to be the same in all respects, apart from the casting number being upside down.  Is this unusual or common?  A couple of photos attached.

Title: Re: Exhaust Manifold Casting Number Orientation
Post by: firstgenaddict on September 17, 2020, 07:31:44 PM

Probably not too common although on the day yours there may have been a number more as it appears someone inserted the ID plate upside down on the pattern.

I believe I have the process correct, positive patterns or pattern boards were used, for making negative sand molds... the patterns or boards have areas for part numbers and casting dates to be changed (sometimes the ends where the screws are located -which hold the number plate- are transferred into the green sand and show up in the casting).