I have the # that is stamped on my engine block and was wanting to know what size engine it is ? engine block # is 3970010

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The casting number was used on 350ci from 1969 to 1979. 2 or 4 bolt main. Was put in Vettes and if so should be 4 bolt main.

patricia
read you post again and see what you missed out on to get answer
you have the engine in front of you but there is no photo , engine number , engine type -diesel,petrol , no cylinder numbers --3,4,6,8,10 etc
if you do not know any of this detail, how will you know what you are doing to rebuild it
post again as posts are not linked

1969-1979 302-350ci.

That is just the casting number indicating it might be a 4-bolt main 350. You will need the stamped numbers on the block right in front of the passenger side head.

From this chart - I think you may be misreading the number - 3970010 is possibly the actual number: Which makes the engine pretty old 68-72 350 V8 - 4 bolt main. I included past this number so that you can see that the number you posted doesn't actually exist. And thus my conclusion that the 9 is most likely a 0. Hope this helps. 3970010 350 69 Corvette late 69,4 bolt main 3970010 302 69 Camaro Z/28,Late 69, 4 bolt main 3970010 350 69-79 Truck 2&4 bolt main 3970010 350 69-79 Pass,Chevelle,Camaro,Nova,MonteCarlo 2&4 bolt main 3970010 350 70 Corvette 300,350,370 HP 4 bolt main 3970010 350 71 Corvette 270,330 HP 4 bolt main 3970010 350 72 Corvette 200,255 HP 4 bolt main 3970014 350 69-77 Pass,Chevelle,Camaro, Nova,MonteCarlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late &undefined;72,200 HP,255HP 4 bolt main 3970020 307 68-73 Pass,Chevelle,Camro, Nova 3970020 307 69-73 Truck 3970024 307 69-73 Pass,Chevelle,Camro, Nova,Truck 3992386 327 68-69 Pass,Chevelle,Camro, Nova,Truck Large Jounal

The "010" embossing on your small block chevy indicates that the block is 10 percent nickel/iron alloy. These "010" blocks can be of either "2 bolt or 4 bolt" crankshaft main cap variety. The 020 blocks are rare, but preferable to 010 blocks as they are 20 percent nickel to iron and are stronger. The higher nickel content makes for a slight add in weight, but a much stronger block. The "S" I'm not sure of yet.

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what is the vehicle that engine is from ? the engine capacity is usually provided on the vehicle registration documents

Numbers on block are of little help .. measure cylinder bore x stroke x8 will give cid ...

Here is a web site that explains the engine you have. It will be a 1975 engine out of a truck with a 145 or 165 horsepower engine. The lesser HP was in referrence with a 2 barrel carburetor

http://www.73-87.com/chevy_ids/scode8.htm