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Old 02-16-2011, 10:18 AM
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i am trying to figure out what my engine came out of help please!!

ok so i know i have a 3970010 4 bolt main it had 3998991 heads the numbers in front of the left head which i believe is the vin is vo317thb and c63308694 i do not know how to decode this and i was trying to look it up which its not really a big deal cuz i tore it down and about to take it to the machine shop to do a 355 build but it is driving me crazy because i cant figure it out lol if anyone can help i would appreciate it thanks

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Old 02-16-2011, 10:34 AM
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If the heads are original to the engine, it's a 350 from a 1977 C30-size truck.

There is a date code on the other side of the rear of the block from where you got the -010 casting number. It will read something like "C 12 7" or something like that.

3970010- '69-'79 302/350 car & Truck 2 & 4-Bolt. This is a common block for having a 4-bolt bottom end and are a good foundation for a performance build.

3998991- 307/350 '68-'79 1.72"/1.50" 76cc chambers. These heads are not what you want to use for a performance build. They have the small valves often seen in the larger truck engines (for torque) and may well have 3/8" exhaust valve stems instead of the more common 11/32" stems. The heads will have a date code similar to the block. You can check to see if the dates fall close to each other to know whether the heads are original to the engine.

THB- '77 350 Truck 165 HP LS-9 Manual 4bbl C 30
THB- '82 350 Truck 160 HP LT-9 Manual 4bbl C-20 & C-30

Last edited by cobalt327; 02-16-2011 at 10:42 AM.
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Old 02-16-2011, 10:49 AM
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Thank you it was driving me crazy yea i figured the heads were junk im going with vortec heads think they would sell on cl or should i just toss them in the scrap pile
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Old 02-16-2011, 12:57 PM
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Quote:
Originally Posted by Danny1986
ok so i know i have a 3970010 4 bolt main it had 3998991 heads the numbers in front of the left head which i believe is the vin is vo317thb and c63308694 i do not know how to decode this and i was trying to look it up which its not really a big deal cuz i tore it down and about to take it to the machine shop to do a 355 build but it is driving me crazy because i cant figure it out lol if anyone can help i would appreciate it thanks
The VIN V0317THB says the following:

- V equals Flint MI plant

- 03 equals March

- 17 equals the 17th day of the month

- THB is code for a 1980, heavy duty truck (1 ton or larger), LS9 350 rated at 165 horsepower with a 4 barrel carb.

If this block isn't cracked and is bore-able, this should be one great foundation to build from.

Bogie

Last edited by oldbogie; 02-16-2011 at 01:03 PM.
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Old 02-16-2011, 01:50 PM
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thanks thats crazy march 17th is my birthday lol it has not been bored and i havent seen any crack but i am gonna be taking it to the machine shop soon
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Old 02-16-2011, 06:06 PM
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Quote:
Originally Posted by Danny1986
thanks thats crazy march 17th is my birthday lol it has not been bored and i havent seen any crack but i am gonna be taking it to the machine shop soon
Before you go off half cocked- check the date code on the block.
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Old 02-16-2011, 06:35 PM
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Quote:
Originally Posted by cobalt327
Before you go off half cocked- check the date code on the block.
These probably won't be the same, The VIN stamping is either the date the block was machined, the engine was assembled, or arrived at a vehicle installation point. The cast in date code is the date the liquid metal was poured into the mold at the foundry. There can be a lot of time between the latter and former events.

Bogie
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Old 02-16-2011, 07:14 PM
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Quote:
Originally Posted by oldbogie
These probably won't be the same, The VIN stamping is either the date the block was machined, the engine was assembled, or arrived at a vehicle installation point. The cast in date code is the date the liquid metal was poured into the mold at the foundry. There can be a lot of time between the latter and former events.

Bogie
The difference in the casting date and the VIN/suffix code will not be measured in years, rather in weeks or months.

The info from here (FWIW, I have found this site to have the least amount of errors among the online sources for suffix codes and casting numbers)- http://outintheshop.com/faq/casting/castings2.html
indicates the following:
THB- '77 350 Truck 165 HP LS-9 Manual 4bbl C 30
THB- '82 350 Truck 160 HP LT-9 Manual 4bbl C-20 & C-30

I also see the 991 heads that are on this engine were used during the same time period ('68-'79) as the first listing shown for the "THB" suffix ('77), not into the '80's.

So if the block and heads' casting dates show this engine to be made in 1977, I would not be the least bit surprised.

BTW, http://www.nastyz28.com/gm-chevy-cod...s-suffix-7.php shows THB to be either '77 or '82. http://www.chevylegends.com/forum/ar...php/t-618.html shows just '82, http://www.chevy-camaro.com/chevy-ca...es.asp?group=6 shows '77 and '82.

These are the first 3 different sites from this google search:http://www.google.com/search?sourcei...vy+suffix+code

I didn't see '80 mentioned in regards to "THB". Any chance your reference material is in error?
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