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post #1 of 8 (permalink) Old Jul 22nd, 00, 05:22 PM Thread Starter
Join Date: Feb 1999
Posts: 6

Can anyone ID this casting number for a small block Chevy?? 3870010 Thanks for your time. Donny
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post #2 of 8 (permalink) Old Jul 22nd, 00, 07:25 PM
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Join Date: Aug 1999
Location: Sacramento CA
Posts: 235

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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post #3 of 8 (permalink) Old Jul 23rd, 00, 01:33 AM
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Join Date: Nov 1999
Location: Atlanta, GA
Posts: 285

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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post #4 of 8 (permalink) Old Jul 23rd, 00, 04:47 AM Thread Starter
Join Date: Feb 1999
Posts: 6

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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post #5 of 8 (permalink) Old Jul 23rd, 00, 03:23 PM
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Join Date: Jun 1999
Location: Ewing, NJ 08560
Posts: 2,438

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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post #6 of 8 (permalink) Old Jul 23rd, 00, 04:26 PM
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Join Date: May 2000
Posts: 31

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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post #7 of 8 (permalink) Old Jul 24th, 00, 04:56 AM
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Join Date: Jan 2000
Location: Forest City, Iowa
Posts: 67

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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post #8 of 8 (permalink) Old Jul 24th, 00, 06:43 AM
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Join Date: Mar 2000
Posts: 715

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

68 RS, Ash Gold,pwr windows,Hounds tooth
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