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Chevy 350 Block Info?


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  #1  
Old 02-19-2018, 07:20:56 PM
Calan Calan is offline
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Default Chevy 350 Block Info?

Hello to all;
Picked up a 4 bolt block to replace my cracked 350, and am hoping for more information.

I see no VIN, so I can't tell what year it is. The block code, (TAX) comes back as either a '70, (w/255 HP) or a '72, (w/175 HP). And, I can't find a VIN in the usual places, (mentioned on the very useful Nastyz28 site).

This is a 010 / 020 block; does this really mean that a bit more tin and nickel were used to make it, or is this internet lore / B.S.?

The three center main bearing caps have 2482 on them; are they the, "nodular" ones folks seem to think highly of? If so; why?

OK, I'll be happy for any info I can get. Suggestions and opinions welcome.
Many thanks;
Alan
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Old 02-19-2018, 07:48:17 PM
Calan Calan is offline
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Default Re: Chevy 350 block info?

OK.
Further research suggests some folks to be of the opinion that the high nickel / tin myth to be 95% true, but only for blocks cast before '71. (http://classracer.com/classforum/showthread.php?t=46239).
There certainly is some interesting debate out there.
So, I'm really hoping mine is a '70. Casting number 3970010, if that helps.
Thanks!
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Old 02-19-2018, 08:30:35 PM
Dustin D Ehli Dustin D Ehli is offline
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Default Re: Chevy 350 block info?

What are your plans for it, both my brothers have 4 bolt main blocks and didn't bother to care what year they were made, both built for approx 450 HP both have a decent amount of run time on them with no issues, so I'd say either way it will be good.
I believe after 450 to 500 ish you should be looking into forged crank and rods though.
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Old 02-19-2018, 08:48:55 PM
G.M.Johnson G.M.Johnson is offline
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Default Re: Chevy 350 block info?

Your block code TAX with casting number 3970010 is a standard 1970 truck block C10-3500 series, 255HP, 4 barrel carb. That block was introduced in May of 1969 and was used through model year 1975. It's your good ole early 1970's 4 bolt main truck block. Yes, the "Nickel" myth is just that, a myth! This information is pulled directly form my " 1965-1970 Chevrolet by the Numbers" book! As far as the nodular center main caps, that would be a no. Blocks that where used in 300HP and over configurations had the longer "nodular" iron center main caps. They would also have their coding beginning with a 'C', and not a 'T'. Still a really good block! When I was regularly street racing on Telegraph in Detroit, I had pretty much the same block, with TRW forged pistons, stock cast crank, cleaned up rods, and balanced, and literally beat the hell out of it almost every Friday and Saturday night all summer! And the was also with a 200HP hit of Nitrous! It was a great motor, and when the subframe finally split on the poor Monza that it was in a local farmer bought it to put in his truck.

Last edited by G.M.Johnson; 02-19-2018 at 09:02:29 PM.
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Old 02-19-2018, 09:40:41 PM
Greg Mosley Greg Mosley is offline
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Default Re: Chevy 350 block info?

Greetings, Heed G.M. Johnsons words of wisdom. The 3970010 is a great platform. Millions made. Cast crank, stock I-Beam rods (suggest to resize and and rebolt- ARP fasteners) KIS-Keep it Simple. I wish Telegraph Road was close in the day, Id would have been there. I ran a 942 w/ 858 heads and 3/8 arms in the basement. Never liked the 858s. I preferred the 702 peanut port CC. She was built in 66 and still breathing fine. Presently .030 10/10. Still all Stock. I just couldn't kill it. Enuf Said
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Old 02-19-2018, 09:52:14 PM
gleaner gleaner is offline
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Default Re: Chevy 350 block info?

Not being a Chevy man I have a 350 question. I have a 1972 G Gleaner combine with the 350 engine. They were only put on the G's in 1972 straight pipe duals straight out. They sounded really good, but also liked the gasoline really good. I know they were a 4 bolt main but were they a beefier engine than the one put in trucks? The combine is no longer used in the field and I would let the engine go from her for a price. So tell me about the engines used by Gleaner in 1972.
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Old 02-19-2018, 10:27:36 PM
Calan Calan is offline
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Default Re: Chevy 350 Block Info?

Thanks to all;
It'll replace a similar block, (TYY) in my '56 Willys CJ-5 Jeep. The V-8 conversion was done by a pro in '70, this'll be the third one. So, I'll be happy as a clam for 255 HP; don't plan to go for much more. Old one was rated at like 165 HP or something, but I know they redefined HP sometime around then.
The last one, ('75 350) ran great even when cracked, and I'll salvage the rods if I can.
Any suggestions about pistons?
I hear cast cranks are fine for HP ranges like mine. But don't know much about them. I'll have my machinist check my old one out; may go w/ that.
The RV cam I have has been perfect for towing and trails; if it looks as great as the lifters do, (nearly perfect) would it be ridiculously cheapass of me to reuse it?
I'm going with ARP bolts all around; no cheaping on that.
Other suggestions, for a build more centered on long life than high power?
Very much appreciated;
Alan
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Old 02-19-2018, 10:40:54 PM
Bob Shannon Bob Shannon is offline
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Default Re: Chevy 350 Block Info?

As you look at the front of the engine. There is a pad in front of were the head sits should be a set of numbers. This will tell you what it came from and equipped
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Old 02-19-2018, 11:48:09 PM
Calan Calan is offline
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Default Re: Chevy 350 Block Info?

Yeah, mine says, "V0624TAX". Only.
Usually, (on my other motor, and others I've seen) there is a VIN # right below that. Not only do I not see any other numbers there, I see nothing like a VIN anywhere.
I think they changed the use of VIN numbers around '69, so I'll pretend it's an early 1970 motor, (or leftover '69 casting) if I can't get it figured.
I bet someone can straighten this out. This is a great site, w/ a lot of great folks.
Appreciated;
Alan
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Old 02-20-2018, 01:05:19 AM
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Dwayne Fuller Dwayne Fuller is offline
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Default Re: Chevy 350 Block Info?

My 69 350 300hp has the vin stamped on the flat where the oil filter screws on.
If you are happy with the bump stick, I say reuse it. At 255hp in that jeep, it should live forever. I built a few screaming 350's back in 79 and 80 but fogot most of what I knew back then. That was nearly 40 years ago! I miss those days.
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