According to the GM parts information, the 250C (M31) and 350C (MV4) for 82-84 G-body Monte shared the same pan part number of 8641376. I would assume that if the 250C pan had ribs, then the 350C pan, being the same pan, would also have ribs. Unless someone can refute it, I'm going by the only evidence I can scrounge up. I mean, after 38 years or so, you can't absolutely say nothing has been replaced on the car, but I'm going to lean toward it being the original pan.All I am saying is I have never seen the ribbed pan on an original car with a 350/350C, maybe the MCSS got them. I don't know. Well aware that they came with the 350C, wasn't suggesting the car had a 250 in it. Just a casual observation of something that seemed odd to me.
GBodyForum is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates.