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Old 04-11-2008, 02:34 PM
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how do i identify a chevy 302 from a 350?

I have a sb chevy that came out of my 70' chevy k10. the numbers on the block are 3970010. I ran the numbers and it came back as to either a 3970010....302.....69....4...Z-28 Camaro or a 3970010....327.....69....2...Trucks and industrial or also a 3970010....350...69-80...2 or 4
. It is not a 327 because it is a 4bolt main. So how would i know if its a 350 or 302? Thanks alot.

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Old 04-11-2008, 02:51 PM
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IF ... you engine is a 302 ...
It would have the code DZ ... stamped in the Engine number/VIN code ... ( shown in the photo ) ... it also would have a block cast date that would go with a 1969 302 engine. The 302's came with a 1178 casting number on the crankftshaft.


Go here for casting number info ... http://www.mortec.com/castnum.htm
and here for VIN code info ... http://www.nastyz28.com/chevy-engine-code-stampings.php
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Old 04-11-2008, 03:34 PM
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Quote:
Originally Posted by coreyk
I have a sb chevy that came out of my 70' chevy k10. the numbers on the block are 3970010. I ran the numbers and it came back as to either a 3970010....302.....69....4...Z-28 Camaro or a 3970010....327.....69....2...Trucks and industrial or also a 3970010....350...69-80...2 or 4
. It is not a 327 because it is a 4bolt main. So how would i know if its a 350 or 302? Thanks alot.
A 302 Chevy would not be found in a pick up unless somebody did a non-porduction swap somewhere in it's life.

The 010 block is simply a heavy duty block with a 4 inch bore. The significance of the bore is that the cylinder cores are moved for the bore size intended in the case. It found it's way into everything from high performance 302s in Camaros to 350's turning irrigation pumps. Depending on how hard it was expected to be used it came in 2 or 4 bolt main verities. The code K truck is considered a heavier duty option than code C trucks which improves the likelihood of the block having 4 mains, a manual transmission in the truck almost guarantees it's a 4 bolt. But the only way to know for sure is to drop the pan and look.

Bogie
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Old 04-12-2008, 10:40 AM
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This is not the factory motor. i did drop the pan and it is a 4bolt main. Will anything else tell me if its a 302 because like i said it had a motor swap.
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Old 04-12-2008, 11:08 AM
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99.9% chance that it is NOT a 302..........But the suffix code will tell you...DZ code..........You could also tear it down and measure the stroke........shorter than a 350
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Old 04-12-2008, 11:10 AM
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302s are quite rare. The 3970010 350s were put in pickups and cars through most of the 70s and are far more common. Chances are about 98% that it's a 350.

Look on the crankshaft for a casting number, you can figure out the stroke length from that. As long as the deck surface has never been machined there should also be some numbers stamped on a small pad just in front of the passenger side cylinder head.
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Old 04-12-2008, 02:39 PM
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remove a spark plug. make up a welding rod or coat hanger to poke down in the spark plug hole so it reaches the piston when the piston is at BDC.
Pointed more or less straight down in the cylinder.
Mark the rod. Turn the crank 1/2 rev from BDC to TDC and stop. Mark the rod where it comes out the spark plug hole again.
The distance between your markes is the crank stroke.
302= 3.00" stroke 327= 3.25" 350=3.48"
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Old 04-12-2008, 09:45 PM
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what is the block date code and engine id#? 302's came in Camaros from '67 to '69. For this block, it would be the '69 only. If "original" heads '69 302 heads 3947041 but, also used on the '69 350. 3970010 was a common block used from '69 to '80 on the 350. Your best bet, quickest way to find out, research the block date code and engine id# on block, if not decked.

I have two of these blocks 3970010 4bm myself.
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Old 04-12-2008, 09:52 PM
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you can also look at the crankshaft. all 302s were forged and 3" stroke. stamped 3923279 or 3941178, hope this helps.
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Old 04-13-2008, 09:15 AM
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I agree with all the above comments...the 302 would not have been in that truck...they are very rare...many engines were 4 bolt and finally...if the pan is removed as you say, the crank casting/forging # is the easiest way to tell what you have. I'm a Ford guy, but I even have casting #'s for most cranks. If you post here with the #s ,someone will be able to tell you. I understand that many heavier trucks came with 4 bolt blocks so that doesn't make it a non factory engine if it does.
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Old 04-13-2008, 04:43 PM
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Not to thread jack, but how much more valuable is a 302 over a 350?
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Old 04-13-2008, 04:57 PM
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same difference between a chevette and a 70 chevelle. Seriously, there is a big buck difference. Not to mention the quick rpm's out of a dz block are a great improvement over a 350
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Old 04-13-2008, 05:02 PM
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Thats really good to hear. I was at a auction from my neighbor who passed away, but he was an old mechanic. Anyway, i picked up what i thought was a 350 and TH 350 for $100 but as it turns out it has the dz code stamped on it. Looks like luck is on my side. Kinda weighs out having my truck die on me.
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Old 04-13-2008, 05:37 PM
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302's were mated to muncie 4 speeds. verify the crankshaft.
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Old 04-14-2008, 03:25 PM
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The trans was separate from the engine. It is a 302 though.
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