350 69 - 79 cast number 3970010 repairable? - S-10 Forum
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350 69 - 79 cast number 3970010 repairable?

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Old 10-26-2012, 07:02 AM   #1
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350 69 - 79 cast number 3970010 repairable?

So yesterday i picked up this awesome 350 virgin block (4.00'' Bore) i could also tell it had low mileage by the absence of the raised metal at the top of the cylinders. After getting it home and having a closer inspection i found rod throw damage. Everything else checks out . Have a look below. Is it repairable? I bought this block for a 100$ bill.


Front Oil Pan Rail Pass Side




Front 2 Lower Cylinders

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Old 10-26-2012, 08:17 AM   #2
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Re: 350 69 - 79 cast number 3970010 repairable?

As long as the crack doesnt run up the cylinder wall it should be a really easy fix. The piston doesnt actually touch that far down so it wont affect the rings at all. Regardless i do think a machine shop will sleeve it anyways just to be sure.
Old 10-26-2012, 08:45 AM   #3
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Re: 350 69 - 79 cast number 3970010 repairable?

So i should get a magnaflux done before i even concider putting money into it? Overall its really not a bad looking block accept for the chewed up part. I want to do a 383 with this but i dont know if i should seeing the damage.
Old 10-26-2012, 08:58 AM   #4
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Re: 350 69 - 79 cast number 3970010 repairable?

i just took a closer look at the top cylinder in that picture and its either a crack or a small gouge that runs at an angle to the right but doesnt go into the ring area. So im probably looking at sleeving. lots of little gouges throughout the unused lower ring area but nothing too serious except for that pan rail chunk. Are they going to have to weld that and plane it?
Old 10-26-2012, 09:03 AM   #5
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Re: 350 69 - 79 cast number 3970010 repairable?

If you're thinking about sleeving it you might as well get another block. The 010 blocks can be had cheap.
Old 10-26-2012, 09:05 AM   #6
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Re: 350 69 - 79 cast number 3970010 repairable?

Possibly im thinking they might sleeve it and not **** with the crack. It doesn't look like it's as bad as it might seem.

but i'm not that knowledgable about machinging yet i know lil more then basic stuff so i can't say for sure what they will do. But that block is definetly not toast i've seen way worse on a buddy's 283 and his was fixed.
Old 10-26-2012, 09:17 AM   #7
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Re: 350 69 - 79 cast number 3970010 repairable?

i want to get at least 350hp out of this motor, but i want at least a 8.5:1 ratio and at max a 9.0:1 ratio with a forged crank and hyper pistons. Kind of like a bulletbroof play toy.
Old 10-27-2012, 10:25 AM   #8
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Re: 350 69 - 79 cast number 3970010 repairable?

What would they do to fix the oil pan rail? I know that's not going to seal a oil pan gasket.
Old 10-27-2012, 10:39 AM   #9
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Re: 350 69 - 79 cast number 3970010 repairable?

it isn't worth the risk.. just get another block, it's not like a 010 block is rare
Old 10-29-2012, 10:40 AM   #10
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Re: 350 69 - 79 cast number 3970010 repairable?

Just found out i cant use it, i punched out the cam bearings and the condition of them pointed toward a broke off piston. I flipped the block over and inspected the front two cylinders again and their is a huge gouge from the side of a piston right in the middle of the ring travel. Trash.
Old 10-29-2012, 01:37 PM   #11
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Re: 350 69 - 79 cast number 3970010 repairable?

damn u gotta wonder what the person before you did to that motor.
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