Dz 302 - Team Camaro Tech
Engine General Engine Discussion.

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post #1 of 15 (permalink) Old Nov 12th, 18, 05:37 PM Thread Starter
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Olepete
 
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Red face Dz 302

I have a 1968 RS that came from the factory with a 327. Last owner had the chance to build and install the 302.
I bought it because it was different. Even if it wasnít correct for the build it was awesome to tell people about the 302.
Now I am not so sure I should keep it. Maybe a 383 or something else might be better in there. Looking for your comments. Not great on motors so need help.
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post #2 of 15 (permalink) Old Nov 12th, 18, 05:52 PM
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Put the biggest small engine you can within your budget.

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post #3 of 15 (permalink) Old Nov 12th, 18, 05:59 PM Thread Starter
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Olepete
 
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Re: Dz 302

Is there someone out there that wants it.
If I can make a good replacement with a bit of an interesting engine Iíll sell it
What would it be worth?
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post #4 of 15 (permalink) Old Nov 12th, 18, 06:31 PM
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Lynn
 
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Re: Dz 302

There is a market for original 302 engines and parts.

You will need to post pics of the engine assembly code. If it is a 69 then it should read something like V0325DZ. You reference a DZ, which is the correct suffix for 1969 302.... but many folks refer to all three years as DZ motors. Technically, not correct, but that's what they do. Please understand, there are probably more restamped 302 blocks out there than genuine blocks.

There are several variables. A DZ block with no other original 69 302 parts (wrong crank, pistons, manifold, heads, etc.) isn't worth nearly as much as a complete running 302 with all the correct components.

Although very difficult to read, it would also be important to know the vin derivitive numbers stamped on the rough part of the block down by the oil filter. Lots of info available at camaros.org. Those numbers would be something like 19N571122. If the car it came out of is still out there, you might have an opportunity to re-unite the car with its original engine.

Lynn
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post #5 of 15 (permalink) Old Nov 13th, 18, 04:20 AM
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Al
 
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Re: Dz 302

As Lynn said, value depends on what is really there. I would start with pics of all parts, casting and dates, etc. The experts here will help to let you know what you have and value! Welcome and best of luck!

Mostly Camaros and FINALLY a Double Nickel
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post #6 of 15 (permalink) Old Nov 13th, 18, 05:25 AM
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Ed
 
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Re: Dz 302

Why do you want to get rid of one of the best highest rev'ing engines out there? The DZ302 was one of the best performance small block engines in my opinion.
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post #7 of 15 (permalink) Old Nov 13th, 18, 06:11 AM
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Dave
 
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Re: Dz 302

Quote:
Originally Posted by ZEN357 View Post
Why do you want to get rid of one of the best highest rev'ing engines out there? The DZ302 was one of the best performance small block engines in my opinion.

I agree it is close to ready to go racing in a TransAm race as you can get; but for the street it sucks. TransAm racing was limited to five liters, which is why Chevy entered the 302 (327 block with a 283 crank). CanAm racing was seven liters but Chevy built a special Mark IV all aluminum block 430 rather than run the ZL-1 aluminum block 427. The rules determine whether the motor is going to be competitive (can you imagine running a 305 in TransAm?)

In 1968 the crankshaft size changed and four bolt blocks where introduced. If he made it out of a 275 horse 327 it will be the large crank but only a two bolt block. If he used a 327 out of a 1967, or earlier ,it will have the small crank and two bolt mains. In 1969 Chevy went to the long water pump. So it could have been built out of a collection of engine parts.

I agree the those above for a street driven car you want as large a displacement as you can find. If you do not know how to build a motor I recommend this one to drop in it's place.

https://www.summitracing.com/oh/part...eprint-engines

https://www.jegs.com/i/Blueprint-Eng...iABEgJGC_D_BwE

You at least now know what it will cost you to replace what you have.

Big Dave
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post #8 of 15 (permalink) Old Nov 13th, 18, 06:26 AM
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Re: Dz 302

Quote:
Originally Posted by ZEN357 View Post
Why do you want to get rid of one of the best highest rev'ing engines out there? The DZ302 was one of the best performance small block engines in my opinion.
Yes the 302 was one of the best engines to do what it was designed to do. Road Course Racing where you run high RPMs to keep it in the power band. Low end torque is next to non existent making it a poor choice for a street driven or drag car.
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post #9 of 15 (permalink) Old Nov 13th, 18, 06:39 AM
R66
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Re: Dz 302

If you have driven the car, you probably already know the 302 with HP cam has very little torque under 3000 rpm and thus requires a low gear in the rear end (4.11 or so) to drive on the street. I ran an original DZ in a 71 Vega at the strip and it was a great high rpm car good to the limits of a 10K tell tale tach. Never hurt the bottom end. Made many big blocks cry at the strip, getting beat by a mouse.
I agree, if you want street HP, go with cubic inches for good torque and usable horsepower.
IF it is an original DZ or MO block (stamp on the engine pad), you may have a rare engine and have trading power. If not, then you may as well use the 4" block to build a 350 or buy a larger cubic inch engine.

Just my $.02
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post #10 of 15 (permalink) Old Nov 13th, 18, 07:43 AM
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Re: Dz 302

In all the years I had the 302 installed, I never had issues driving the car in Chicago area traffic due.......Now, with that said I agree to go bigger if you have the $$$.
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Sold 6-1-2014 after owning the car for 18+ years

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post #11 of 15 (permalink) Old Nov 14th, 18, 04:05 PM
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Randy
 
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Re: Dz 302

[QUOTE=Larger Dave;
In 1968 the crankshaft size changed and four bolt blocks where introduced. Big Dave[/QUOTE]

If I'm not mistaken the 657 '68 blocks were still 2 bolt and it was in the '69 year when Chevrolet began using the 010 blocks that 4 bolt mains were used..

Documented Canadian 1968 Z/28
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post #12 of 15 (permalink) Old Nov 18th, 18, 09:19 AM
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Re: Dz 302

Any chance you could tell me block dates and serial number. I have a non matching numbers Z/28 here in BC.
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post #13 of 15 (permalink) Old Nov 18th, 18, 11:16 AM
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Re: Dz 302

Quote:
Originally Posted by realzed View Post
If I'm not mistaken the 657 '68 blocks were still 2 bolt and it was in the '69 year when Chevrolet began using the 010 blocks that 4 bolt mains were used..
I think you're right - 68 302 engines were still two bolt mains. I have an MO engine with most of the original parts. It has a forged crank but two bolt mains...
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post #14 of 15 (permalink) Old Nov 18th, 18, 12:45 PM
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Re: Dz 302

There were four bolt 386,388,618 and possibly other blocks in 69
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post #15 of 15 (permalink) Old Nov 20th, 18, 07:01 AM
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Re: Dz 302

Gene; Am in BC and visit my son and family in Edmonton regularly. Have interest in your 302 as I have a Z/28 with a non matching engine. Can you get some pics and casting numbers to me. [email protected]
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