I Have A Motor Block That Is Marked G M 3970010. I'm Not Sure What It's For Or It's Possible Value, Does Anyone Have An Answer, Because I'm Clueless?

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Anonymous Profile
Anonymous answered
Small Block Chevy BLOCK # 3970010
Engine Block Casting Numbers

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.SBC BLOCK # 3970010

Engine Block Casting Numbers

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.

The 010's have always been considered to be a good 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 in Corvette, Camaro, Chevelle, Nova, Monte Carlo'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 1 percent tin and 2 percent nickel content. That means it's very desirable for a performance. Block. They have a good nickel and tin content. I would take as many of these as I could afford just to keep on hand.

The 010's have always been considered to be a good 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 in Corvette, Camaro, Chevelle, Nova, Monte Carlo's and pass. Cars. Look at your oil filter housing and see if there is a 010 or 020 stamped there.

This will tell you that the block was made with an extra 1 percent tin and 2 percent nickel content. That means it's very desirable for a performance block.
Anonymous Profile
Anonymous answered
That is your casting # 3970010! If you look on the passenger side or right of the car, under the alt, in front of the head. You will find a tab sticking out this has two # on it a big one about a 1/8 inch tall and a small number about a 1/16 inch tall. The small one is your vin # for the car it came out of. 73 and older blocks the vin number was inside the oil filter housing pull out the two bolts you will find it there. This block could be a 302 327 or 350. The 350 had a 4 inch piston bore, and the 302, 327 where smaller. This block is where 80% of today's GM HI Performance Blocks got there design. It can handle 475 HP efficiently. Anything over that is pushing it.

Hope this was helpful,

The machinist
thanked the writer.
Anonymous
Anonymous commented
Please help I have a 3970010 chevy motor and number on passenger side front is 15r422384 what is it
Moo C. Profile
Moo C. answered
That's probably the code to show which model it is and the number is just to make sure that no one counterfeits it  so if there can't be multiple motor blocks that have the same numbering and lettering as yours unless it's a counterfeit one

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