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| | | | Joined: Apr 2009 Posts: 16 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2009 Posts: 16 | ok i wanted to post this to see if anyone may know what the deal is i have a 1972 chevy custom/10 1/2 ton it has a 350 trubo automatic ok heres my question my engine block casting number is 3970010 and i been looking around and some chevrolet sites say that that block casting number was a universal block that by that number it can be a 302, 327 or a 350 how can ytou really tell??? and could a 1972 chevy truck come with a factory 327 ?? but the trans is a 350 or is it a factory 350 with the factory 350 turbo auto trans ????? | | | | | Joined: Jun 2005 Posts: 1,756 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 1,756 | I show it a 350 made 1969-80 in either 2 bolt or 4 bolt main,
Info from mortec.com/castnum.htm | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | A '72 would have a 350, '68 was the last year for the 327. Also, from what I understand, all 4" bore Small Blocks from '68-'73 (exept for the '68 327) had 4 bolt mains.
Bill Burmeister
| | | | | Joined: Jan 2008 Posts: 239 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2008 Posts: 239 | An 010 block is a good foundation. There were never any factory 4 bolt 327s, and only 68 and 69 327s were large journal. 69 was also the last year for both the 302 and 327. Anything is possible if the engine has been changed. If it is the original engine, however, it will be a 350 with that block.
Devin
If you can't hose it out it ain't a truck
55 3100
63 Corvair Monza
64 El Camino
72 240Z
01 Suburban
| | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | I have seen a "010" block in both 2 bolt main and 4 bolt main. Your truck would have a TH350 transmission in it from the factory. I think that the 3/4 ton and bigger pick-ups could be built with a TH400 transmission. Some of the more "basic" 3/4's did come with only a TH350. The only lighter trucks that did come with the TH400 were equipped with a big block motor. | | | | | Joined: Feb 2009 Posts: 66 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2009 Posts: 66 | My '70 GMC had a stock 350 that was blown shortly after it was bought from what I can tell. Right now it is a hodge podge Target Master Motor and the original together. your's is most likely a 350 though.
Last edited by Reedster; 05/05/2009 9:12 PM.
"So this year, I am upgraging my policy of zero tolerance to one of SUB-zero tolerance, which is MORE than zero." -Principal Jindraike
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | There were never any factory 4 bolt 327s
Devin Actually, there were 4 bolt 327s. However, they never made it to regular production. From what I was told (by a reliable source) GM did experiment with a 4 bolt 327 as a high rpm race only engine. Those experimants were wll before the 350 came to be.
Bill Burmeister
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