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Author Topic: Motor casting numbers Is it a 350/302???  (Read 2022 times)
« on: October 05, 2006, 05:35:11 PM »

My father in law just looked at a block fro me down in atlanta and I'm a little confussed about if its a 350 or 350 with 3O2 heads/intake.

Here's the numbers:

Block:  3970010  (4 bolt main)    CNR on deck  The R might be a B???

On the back of the block is a H35   010 and 020     aslo a 9 T N

Heads:  3927186  with a K250

Aluminum Intake:  3932472

What do we have here, a 350, a 302, or a mut?

He can pick up the motor with a Munice M 20 4 speed (3885010) for a really good price...

Please let me know what you think this is so I can tell him whetehr to get it for me or not.

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« Reply #1 on: October 05, 2006, 06:56:15 PM »

Ok the heads are from a 1971 model vehicle, the block is from 1970 or later, but the CNR or CNB doesn't seem to correspond to a Camaro motor, according to the info at If you don't get more info here, you may try over at, they work with all years of Camaros, while this is a first generation only site.  Smiley
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« Reply #2 on: October 05, 2006, 07:13:56 PM »

How about CNK?  That would be a 1970 AT/350.

« Reply #3 on: October 06, 2006, 08:03:08 AM »

Weren't those heads and intake used on a 69 302 "Z-28" Huh?

I beleive the correct Holley carb is also present....
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« Reply #4 on: October 06, 2006, 09:14:39 AM »

The "CNR" suffix was a 1970 350/300hp automatic from a full-size passenger car, and the 186 heads had many other applications (including trucks) besides Z/28's. It's probably a passenger car 350 with transplanted 186 heads and a Z/28 intake.

'69 Z/28
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