Need help decoding block - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 11-28-2020, 09:22 PM

It's all about the stamped #, not the embossed casting #. But usually it's the suffix code. This is a prefix code. Does that mean it's a Mexican block?

**rechinca** · 11-28-2020, 10:49 PM

Quote:

Originally Posted by special-K

It's all about the stamped #, not the embossed casting #. But usually it's the suffix code. This is a prefix code. Does that mean it's a Mexican block?

Except in this case for the casting (and most GM crate motors now) that have Made In Mexico cast above the normal casting number on the back. In that case its more about the casting out of the gate as that, as far as I have seen, where that cast into the block will tell you the it was never a factory installed block and most likely not a warranty block/engine.

11-28-2020, 09:22 PM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: Need help decoding block It's all about the stamped #, not the embossed casting #. But usually it's the suffix code. This is a prefix code. Does that mean it's a Mexican block? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

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