Chevy short blocks

Bill Cleveland · Post by **Bill Cleveland** » Mon Feb 16, 2015 11:17 am

I have a chance to aquire a "1 piece rear main seal" 350 short block cheap, and was wondering if there are real benefits with this block over the old 2-piece rear seal block?

Dewey Burton · Post by **Dewey Burton** » Mon Feb 16, 2015 6:48 pm

They are harder to Change it they leak ...That being said I snatch up every block I can find..they are getting harder to find....

Bill Cleveland · Post by **Bill Cleveland** » Tue Feb 17, 2015 5:49 pm

Thanks, SparkPlug. Good advice!

Bill Cleveland · Post by **Bill Cleveland** » Wed Feb 18, 2015 10:45 am

One other thing . . . any truth to the rumors that many of the currently available 350 chevy blocks are made in Mexico? If so, any quality differences that are important???

Orville Duncan · Post by **Orville Duncan** » Wed Feb 18, 2015 1:52 pm

Si, Hecho en Mexico

Dewey Burton · Post by **Dewey Burton** » Wed Feb 18, 2015 3:29 pm

I have had a Mex 350 short block in my bucket for about 10 years now...no trouble ..it is true that the old cams from mexico used to flatten out , but those were in the old 305 / 307 or whatever they were .

cecil misner · Post by **cecil misner** » Tue Mar 31, 2015 11:03 pm

350 blocks are cast in the US, Canada, and Mexico. I am not aware of any identifying marks or numbers that indicate where they are cast.
Ceec

AKGrouch · Post by **AKGrouch** » Tue May 05, 2015 5:07 pm

The crate motor in my coupe has a 4 bolt main 350 block from Mexico...no problems with it. The #'s on the 2 bolt and the 4 bolt are the same, so you have to pop the pan to see which you have.

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Chevy short blocks

Chevy short blocks

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