SBC #3970010 is this a good block ? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-29-2004, 07:39 PM
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SBC #3970010 is this a good block ?

I just pulled this SBC from a 34 Vicky and this is the number on the back of the block. 3970010
What I can determine is a 2 or 4 bolt main
How else can I tell with out pulling the pan. Is this a engine worth re building, anything special about it ??

Thanks
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Old 08-29-2004, 08:05 PM
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SBCbLOCK # 3970010

This is probably the most common 4" bore SBC Block cast. It has been used in many different applications. Only way I know to be sure of 2 or 4 bolt mains is to pull pan. I have had or machined many of these and they have a good nickel and tin content. I would take as many of these as I could afford just to keep on hand.
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Old 08-29-2004, 08:06 PM
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It is one of the many sb Chevies produced from 68 thru the late seventies, cast at the Saginaw Mi. gray iron foundry, assembled in Flint Mi. engine plant. They came in two or four bolt. Only way to be sure is pull the pan.
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Old 08-29-2004, 08:08 PM
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Look above the casting numbers and you`ll see "hencho en mexico" meaning made in mexico, this is a target master 4 bolt main block. Honestly, I don`t like these blocks, some have problems out of them and some don`t, some liked to crack while others were just made of poor materials and workmanship.
If the block was running okay once removed then go ahead and do what you wish with it, my motto is the same for all blocks, if it cracks it cracks if it don`t it don`t.
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Old 08-29-2004, 08:11 PM
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according to my book its possible that it's a 4 bolt main there are several applications for it including late 69 z/28 4 bolt main or possibly a 302 from a camaro it seems to be most common as a 69-73 4 bolt main vette motor so its worth checking out.



oops.. i missed a line it also says 69 to 79 pass. or truck block so i guess as stated above that it was a common block. but you still never know!

Last edited by helrazr3; 08-29-2004 at 08:15 PM.
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Old 08-29-2004, 09:00 PM
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while you can always do better if you spend the money the 010's have always been considered to be agood block to use.your block was used probably about as much as any chevy block ever was used from april or may 69' through 75'.it came in 2&4 bolt mains and was used extensively in trucks.also corvette,camaro,chevelle,nova,montecarlo's and pass.look at your oil filter housing and see if there is an 010
020
this will tell you that the block was made with an extra i percent tin and two percent nickle content and that means its very desirable for a perf. block.if not don't worry about it unless you're looking for more than five hundred horse.these numbers will be behind your timing cain cover also.but you can look at the oil filter housing with out disasembling anything.

the mexican crate motors were made extra h.d.how are they not good?the mexican motor is 10066036.

Last edited by GoneNova/406; 08-29-2004 at 09:00 PM.
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Old 08-29-2004, 09:52 PM
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Check for any core shift in the cam boss...
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Old 08-30-2004, 12:47 AM
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These were 70s ish era blocks w/ higher nickel.I've had 1 4bolt and 2 2 bolts.
Seriously I would take a high nickel 2 bolt over a non-high nickel 4 bolt.
I like these blocks I've had a couple realy reliable motors w/ this casting.
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Old 06-06-2007, 12:40 PM
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1968 Blocks

Hello from Columbus Ohio I'm a newbie to this Hot Rodders blog, I have a couple questions I notice your talking about if 390010 block was worth anything or not I have a 3956618 block that is a 350 is there anything different from my block to the other guys block beside his a 4 bolt main? I learn something new on this blog that some blocks were made out of different materials in that realm of that number tin and nickel, does that go the same with my block. If any body has an answer feel free to let me know. Everybody have a great day!
Dan
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Old 06-06-2007, 03:06 PM
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both the motors could be a 302 327 or 350 2 or 4 bolt mains

this is for the 3970010 block

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

and for the 3956618 block

3956618....302.....69....4...Z-28 Camaro
3956618....327...68-69...2
3956618....350.....69....2 or 4

the only difference is the 327 3970010 block was a truck industrial motor as you can see.

Hope this helps

Ed
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Old 06-06-2007, 07:40 PM
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SBC #3970010 is this a good block ?

Yes it does. Is there a code# around the oil filter area that would tell you what the motor was made out of, is so what codes tell me what? Again thank you for your time I appreciate it. Thanks Dan
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Old 06-06-2007, 08:18 PM
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There is a serial number stamped on a little pad above the water pump next to one of the cylinder heads. Post that and somebody can give you more information about your engine.
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Old 06-06-2007, 08:43 PM
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Quote:
Originally Posted by GoneNova/406
the mexican crate motors were made extra h.d.how are they not good?the mexican motor is 10066036.
The one I bought in 87 was a 3970010
also a Hecho in Mexico

changed the cam and timing set---ran the crap outta it til 94
never used a drop of oil between changes
Pulled trailers and rodded this thing til no tomorrow
200,000mi---sold it for $350---and the guy told me later---best engine he ever had.

Bryan
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Old 06-06-2007, 09:11 PM
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Quote:
Originally Posted by Sandflea427SS
Check for any core shift in the cam boss...
From what we have seen sonic testing all the blocks we have go through the shop the core shift in most cases does not relate to cylinders being thin on one side.

As we have seen some blocks we a ton of core sift and the cylinders are fine and we have one in the shop now that the ocre shift is perfect and one cylinder is like .120 thick on the thrust side.

I would look to see of it has 2482 caps on the center mains if its a 4 bolt main as thos were the cpas GM put on ther heavy duty and pefromance applications and if its sonic test good you then have a real good peice.
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Old 06-07-2007, 05:47 AM
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Monza

Thanks everybody for all the help on the block,now I live in Columbus Ohio I was wondering if any body has fiberglass body parts for a 1980 Monza Coupe for a reasonable price I'm on disability you know how it goes.
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