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Old 10-07-2009, 08:31 AM
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Jay's GM Engine Block ID

Question to you motor gods - I have what I believe to be a Chevy 350.
I have a 3970010 block with k03 22 TBC stamped on the front passenger side.
I'd like to know what the engine is: Can anyone make sense of the code and suffix for me?

It's a 4 bolt main, Is it worth rebuilding and what horsepower can I get out of it?
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Old 10-07-2009, 03:09 PM
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A simple visit to www.mortec.com would have found the following:

3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

A simple Google search for the TBC engine code would have taken you to www.nastyz28.com and you would have found the following:

TBC 1979 350 conv. cab, m/t,fed L LS9 165 4 C-10 to 2500

Your engine was a 350 from the factory with a manual transmission behind it in either a 1/2 or 3/4-ton pickup, and it put out 165 horsepower from the factory with a Federal emissions package, meaning it wasn't destined for CA.
It also originally had a 4 barrel carburetor on it.

It's definitely worth keeping as it's a pre '85 4 bolt main 4 inch bore small block SBC, it can be made into a 302, 327, 350, or 383- and if it hasn't been previously bored out already it can be rebuilt at least a couple times.
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Old 10-07-2009, 03:50 PM
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More>> http://www.chevymania.com/chevymania...fm?block=Small
Code- Year- CID- Vehicle- HP-- RPO--- Trans-- Carb---- Comments ------
TBC--- 70-- 350- Truck-- 255- LS-9-- Manual- 4-Brl---- C10 & C 20, 4X4
TBC--- 71-- 350- Truck-- 255- LS-9-- TH 350- 4-Brl---- All Models------
TBC--- 79-- 350- Truck-- 165- LS-9-- Manual- 4-Brl----------------------

The Block Casting date, which is close by the Casting number will narrow the year down more. >> http://www.mortec.com/location.htm
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Old 10-08-2009, 05:31 AM
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Awesome info guys, thanks! Now to begin the rebuild...Any pointers.
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Old 10-08-2009, 01:28 PM
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http://www.amazon.com/How-Rebuild-Yo...5030063&sr=1-5
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