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#1043381 - 09/10/16 05:10 PM SBC #3970010 is this a good block ?  
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ray6914 Offline
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pittsburgh pa
number on the back of the block. 3970010 / heads 376445 / serial number stamped on a little pad is V0220AAB

#1043382 - 09/10/16 05:58 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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upflying Offline
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Reno, NV


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1043384 - 09/10/16 07:10 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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86ttop Offline
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That is not the serial number, but the production date and application. V is for Flint engine plant, good luck. The 010 block is supposed to be a good one.


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#1043396 - 09/10/16 11:07 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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MAP Offline
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Yuma, AZ
Yes, *010 is the high-nickel, low-wear iron alloy. If you look at the block under the timing chain cover, you should see either 010 or 020 as I recall. 020 corresponds to the higher nickel content of the two possible variants of this block.

Best,
MAP

#1043414 - 09/11/16 01:57 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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Joe87monteSS Offline
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Memphis,TN
I doubt that its a high nickel block, but being that it is from a c60 dump truck, it could have a steel crank in it. Possibly 4 bolt main as well.


Joey
Engine/head builder/machinist
1987 Monte Carlo SS 383/4 Speed
2004 Silverado
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#1043527 - 09/14/16 11:31 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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MAP Offline
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Yuma, AZ
Hi folks,

3970010 was used from 1968-1979 in just about any vehicle that had a 350. It has higher nickel (and tin) content than the other blocks, which makes it stronger and longer-wearing. Additionally, 010 or 020 cast under the timing chain cover, or allegedly above the oil-filter boss, further indicates just how much extra nickel the block has - but I don't recall how these numbers decode.

Best,
MAP

Last edited by MAP; 09/14/16 11:32 PM.
#1043541 - 09/15/16 06:07 AM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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Buick Runner Offline
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Dharma station 1 the Hydra
I heard 010 and 020 are merely core casting mold numbers and nothing to do with the iron alloy. Even Bowtie blocks only have 5% nickel.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

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#1043565 - 09/16/16 04:16 AM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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BadSS Offline
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If you do a little research on this, you’ll see there was more than one guy that worked at the GM foundry that said while the original intent of those 010/020 markings were to indicate the metallurgy,, somewhere in the late 60s GM decided the tracking system wasn’t working and abandoned the concept. One of the guys went on to say the molds continued to be used for varying standard or typical production runs and you can’t go by that indicator on the 70’s and up blocks. He also went on to say that some of the part numbers do have a higher tin and/or nickel content and varying cooling times were applied (that determines the hardness of the metal). However, due to the nature of the business those “set” cooling times were dictated by the upstream line on many occasions and therefore could vary significantly enough to make differences in those runs as well.

That said, a good machinist friend of mine did a lot of research on the subject and based on his 30-years of experience does believe the earlier year 010/020 blocks seem to be better than most. However, he believes any are OK as long as there little to no core shift and the cylinder wall thickness is sonic checked. He’s definitely made me a believer in having any block used for a high performance build sonic checked, even new aftermarket blocks as he has seen more than one with anomalies in the wall thickness.

#1043624 - 09/17/16 07:31 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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MAP Offline
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Yuma, AZ
Hi BadSS - great information. Thanks! Best - MAP

#1043657 - 09/19/16 12:56 AM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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Rebelson101 Offline
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spring lake nc
yea i was under the impression it was the % content 10% or 20% but i never really looked into it that well. good info


ETHER RAY
#1043679 - 09/19/16 01:56 PM Re: SBC #3970010 is this a good block ? [Re: ray6914]  
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mainer Offline
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new gloucester, ME
as BadSS said I would be more concerned with Core shift to start with , easy to see by how centered the cam is in the cam boss , and sonic testing if you find one that is centered , low nickel blocks are mostly rotten (rusted flaking ) around here ,


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