Author Topic: 1969 302 DZ/CNA Block  (Read 5823 times)

Logroller

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1969 302 DZ/CNA Block
« on: September 13, 2016, 12:43:09 PM »
I own a 1969 Z/28 with a 302 CNA motor. Has anybody ever heard of one of these. I did some research myself and this is what I came up with. My first investigation was a 1973 Chilton professional edition which says that in 1969 the Z/28 came with a DZ with a * (DZ*) next to it. When you look at the bottom of that page it tells me that it is a late production 1969 302 Z/28. So the next investigation I did was I went to Chevy Camaro engine suffix codes and it showed me that in 1970 chevy made a 302 with the same specs. as the 68 and 69 and only came in the Z/28. But if you talk to anybody else they never heard of such a thing. Then I went to CRG wedsite and started looking at all the specs for my 69 Z/28 and everything matches, like the block I have is a 3970010 which was built in August of 1969. My body is an X33. My CNA block is stamped VO 0915 which means produced in September 15, 1969. Could some one put some light on this subject for me......  Thanks

69Z28-RS

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Re: 1969 302 DZ/CNA Block
« Reply #1 on: September 13, 2016, 01:06:40 PM »
They used the '010' block for many years building 350's.  To my knowledge, the 'late '69' Z28s were the last 302's built by Chevy (except for perhaps CE warranty or OTC short blocks), and all the late '69 302s I've seen had application stamp of DZ. 

What is the casting date on the back of the block??  Can you provide a photograph?
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
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bertfam

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Re: 1969 302 DZ/CNA Block
« Reply #2 on: September 13, 2016, 02:27:46 PM »
Can you post a picture of the pad and the casting date on the block? And what's your VIN?

Yes, the 302 was still produced after 1969 and installed in the FIRENZA. However, your suffix code of CNA indicates a 1970 Z28 350/360 engine and not a 1969 Z28 302/290 engine.

Is there a chance a 1970 Z28 engine was factory installed in your 1969? The chances are slim at best, but I'll reserve judgment until I can see the pad and get more info.

Ed
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Logroller

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Re: 1969 302 DZ/CNA Block
« Reply #3 on: September 13, 2016, 06:21:01 PM »
My VIN# 124379N642244
Date on the back of the block is August of 1969.
The Suffix code for a CNA is a 1970 302/290hp not sure where you found it to be a 1970 350/360hp.
Also how much truth do I put into the Chilton 1973 Professional edition?
Mike

69Z28-RS

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Re: 1969 302 DZ/CNA Block
« Reply #4 on: September 13, 2016, 06:31:12 PM »
Can you post a picture of the pad and the casting date on the block? And what's your VIN?

Yes, the 302 was still produced after 1969 and installed in the FIRENZA. However, your suffix code of CNA indicates a 1970 Z28 350/360 engine and not a 1969 Z28 302/290 engine.
...
Ed

Ed,  Thanks for educating me on 302's produced for South African race cars (Chevrolet Firenza Can-Am); I had no idea Chevy produced 302's in 1972-3 for this purpose!  I'd love to see more detail (ie. production dates, application stampings, etc) on these engines for comparison to our '69 Z28 specs..    purely for curiousity purposes, as I have little/no interest in going to so. Africa to obtain one of these beasts.. :)
Gary W / 09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette convertible, silver/black 350 hp,
60 Corvette white/red, 72 Corvette coupe, '70 Mach I 
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

bertfam

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Re: 1969 302 DZ/CNA Block
« Reply #5 on: September 13, 2016, 06:43:51 PM »
Quote
My VIN# 124379N642244 Date on the back of the block is August of 1969.

Mike, your car was assembled in early May, 1969, so that block isn't original to your car.

Quote
The Suffix code for a CNA is a 1970 302/290hp not sure where you found it to be a 1970 350/360hp.

The 1969 302 was coded DZ. Even for the 1970's Firenza's. CNA is a 1970 Z28 350/360 with manual transmission.

Quote
Also how much truth do I put into the Chilton 1973 Professional edition?

For "numbers", I wouldn't put a lot of trust in it. However, for "repairs", the Chilton series is very good.

Ed
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Logroller

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Re: 1969 302 DZ/CNA Block
« Reply #6 on: September 13, 2016, 07:05:25 PM »
www.chevy-camaro.com
www.mkmann.com
In these two websites they list the CNA block a 1970 302/290hp w/manual transmission.

bertfam

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Re: 1969 302 DZ/CNA Block
« Reply #7 on: September 13, 2016, 07:06:56 PM »
Quote
I'd love to see more detail (ie. production dates, application stampings, etc) on these engines for comparison to our '69 Z28 specs..

Gary, I don't believe there are any differences between the 69 Z28 and the Firenza 302 engine, but I'm hardly an authority on those cars!

Ed
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bertfam

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Re: 1969 302 DZ/CNA Block
« Reply #8 on: September 13, 2016, 07:08:47 PM »
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In these two websites they list the CNA block a 1970 302/290hp w/manual transmission.
www.chevy-camaro.com
www.mkmann.com

Mike, the chevy-camaro site is riddled with errors. If you want better references, use this site and/or Chevrolet by the Numbers by Alan Colvin, a member of the Camaro Research Group. The other site you posted is a religious site.

Ed
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Logroller

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Re: 1969 302 DZ/CNA Block
« Reply #9 on: September 13, 2016, 07:36:32 PM »
I take it you have one of Alan Colvin's books and that's where your getting your information from?   I'm looking to sell my car and now I'm not sure what to ask for it? Its between a #2 and #3 body. Do you have a suggestion what I could sell it for?
Thanks for all the info.....
Mike

KurtS

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Re: 1969 302 DZ/CNA Block
« Reply #10 on: September 13, 2016, 07:44:51 PM »
It looks like CNA (302/manual) and CNB (302/TH400) were 302 codes that were pulled for 1970 production and then never used, since the Z went to a 350.
CTBN doesn't list them since they never made production.

I'd like to see a pic of the pad - never seen a CNA.

And yes, that block is not original to your car.
Kurt S
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Logroller

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Re: 1969 302 DZ/CNA Block
« Reply #11 on: September 13, 2016, 07:50:22 PM »
I guess I just don't understand why then is the back of the motor or block by the firewall stamped  August of 1969?

bcmiller

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Re: 1969 302 DZ/CNA Block
« Reply #12 on: September 13, 2016, 07:58:50 PM »
Can you post some pics or send them to me and I will post them.

I will send you a PM.
Bryon / 1968 Camaro SS 396 - now 468 ci, M21, 12 bolt
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KurtS

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Re: 1969 302 DZ/CNA Block
« Reply #13 on: September 13, 2016, 08:05:15 PM »
That was when the 1970 model year was supposed to start. It was pushed back until Jan 1970.
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bertfam

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Re: 1969 302 DZ/CNA Block
« Reply #14 on: September 13, 2016, 08:25:55 PM »
Quote
I guess I just don't understand why then is the back of the motor or block by the firewall stamped  August of 1969?

I think you're looking at the casting date of the block, which lines up correctly with the suffix date of 09-15.

As for value, that's very difficult to say without seeing the car. Posting a few pictures might help, or posting a LOT of pictures on a site like PHOTOBUCKET (or similar) would probably help even more.

The engine's not original so that will lower the value, but if you have any original documentation, that would offset the non-original engine a bit. Do you have any docs for the car?

Ed
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