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Discussion Starter · #1 ·
Can anyone ID this casting number for a small block Chevy?? 3870010 Thanks for your time. Donny
 

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If the 8 1s actually a 9, then the block is a 4 bolt main used in 350 & 302 applications & produced from 1969 thru 1975 or 76 (?).
 

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You will need to check the casting date which is located near the casting numbers and post the stamped information from the front pad to find the year and what car it originally came in. Use the "Tag Team" section of this site.
 

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Discussion Starter · #4 ·
The front pad has been machined and there are no other numbers visible on this block as it is still in the vehicle. The numbers are definitely 3870010. One other note, the damper is BIG and the heads are "186". Thanks guys.
 

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Do the dates from the heads come close to the block date? Are the valves 2.02 & 1.6? If so, you probably have a 69 DZ 302 motor. Check the crank and pistons for part #'s if the motor is apart. Sounds like a nice engine.
 

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Just for informations sake not all 010 blocks are 4-bolt main blocks.I personally took a 010 motor out of a 74 or 75 malibu and to my dissapointment, it was a stinkin 2-bolt block.Also the 69-70 186 head came large and small valve,and on a variety of cars.I have taken small valve 186s off a 70 monte carlo,and a 69 impala.
 

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My Dad also took apart a 0010 block (out of i dont remember what) and it was a 2 bolt, but it had the meat for a 4 bolt, it just never was machined for the other 2 bolts
 

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I had 2 of these blocks, they are 3970010. A majority of them are 4 bolt main blocks.

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68 RS, Ash Gold,pwr windows,Hounds tooth
 
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