why did they put a 302 in the Z? - Team Camaro Tech
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post #1 of 59 (permalink) Old Mar 25th, 08, 10:49 PM Thread Starter
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why did they put a 302 in the Z?

I'm looking at a Z with a 302... I've never driven a Z yet. obviously Chevy knew what they were doing, but why did they use a 302? You hear so much good stuff about the Chevy small block 350. I'm sure Chevy knew what they were doing... just curious.


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post #2 of 59 (permalink) Old Mar 25th, 08, 10:59 PM
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Re: why did they put a 302 in the Z?

It was utilized for use in SCCA racing, which had a limitation on cid.

The Z/28 grew in popularity on the street, so the production #s went up each year from 67-9.

Driving a #s-matching Z in the rain..... and lovin' it....
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post #3 of 59 (permalink) Old Mar 25th, 08, 11:01 PM
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Re: why did they put a 302 in the Z?

Read here:

http://www.67z28.com/history.htm

Basically to get the Cubic inches under the SCCA rule or limit of 305 CI.

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post #4 of 59 (permalink) Old Mar 26th, 08, 07:23 AM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by Jonesy View Post
Read here:

http://www.67z28.com/history.htm

Basically to get the Cubic inches under the SCCA rule or limit of 305 CI.
Mike,
Awesome Article.
Thank You.

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post #5 of 59 (permalink) Old Mar 26th, 08, 07:43 AM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by okiemark View Post
I'm looking at a Z with a 302... I've never driven a Z yet. obviously Chevy knew what they were doing, but why did they use a 302? You hear so much good stuff about the Chevy small block 350. I'm sure Chevy knew what they were doing... just curious.
The gentlemen that have responded are absolutely correct regarding why Chevy went with the 302. What you might not realize is that the 302 will absolutely smoke a 350...in this case, size doesn't matter!

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post #6 of 59 (permalink) Old Mar 26th, 08, 10:18 AM
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Re: why did they put a 302 in the Z?

Well you are correct that the 302 will outperform a stock 350 chev of the same year... chevy did pull a few tricks to get that done like under rating/advertising the hp that the 302 (also solid lifters and basically a not very street friendly cam)puts out also these engines were primarily backed by a 355 or 410 gears I believe where as most of the 350's were backed by a much more highway friendly diff. Not to mention the transmission oops i just did lol.

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post #7 of 59 (permalink) Old Mar 26th, 08, 10:43 AM
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Re: why did they put a 302 in the Z?

And that horse power rating was a turn-off for some of us kids. 290HP?? Nope, give me muscle! L78 for me! Well, actually, I bought my L88 stuff a year before I ordered my car. I planned to swap but my buddies said that the L78 would be so strong that I wouldn't bother. They were right, but then it broke. For some reason I haven't been able to break my L88??????

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post #8 of 59 (permalink) Old Mar 26th, 08, 10:46 AM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by edhjohnb View Post
The gentlemen that have responded are absolutely correct regarding why Chevy went with the 302. What you might not realize is that the 302 will absolutely smoke a 350...in this case, size doesn't matter!
Stock to stock maybe. My built 350 will run with any 302 easy.

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post #9 of 59 (permalink) Old Mar 26th, 08, 11:00 AM
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Re: why did they put a 302 in the Z?

They also wanted to make sure that as many ford engineers would loose they jobs as possible.


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post #10 of 59 (permalink) Old Mar 26th, 08, 04:02 PM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by edhjohnb View Post
The gentlemen that have responded are absolutely correct regarding why Chevy went with the 302. What you might not realize is that the 302 will absolutely smoke a 350...in this case, size doesn't matter!
Actually, only sort of. If you compare them as delivered from the factory, usually, but not always. Now if you give the 350 the same compression, cam, heads, intake, and big ol'honking Holley that the 302 came with, nope, the little 302 won't stand a chance. Now if you ordered a SS350 with the top rated 350, with a 4 speed, cold air induction, and a 4.11 rear end, I bet it would give the stock street version of hte 302 a run for it's money.
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post #11 of 59 (permalink) Old Mar 26th, 08, 04:12 PM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by edhjohnb View Post
The gentlemen that have responded are absolutely correct regarding why Chevy went with the 302. What you might not realize is that the 302 will absolutely smoke a 350...in this case, size doesn't matter!
I have to respectfully disagree. I've had the 69 Z/28 engine, the 302, and the 1970 Z/28 engine, the LT1 350, in the same car. In stock form the 70 LT1 350 moves the car quicker on the street and at the strip. Putting aside minor details, they are essentially the same engine except the 350 has a longer stroke. While the 302 will wind a bit tighter, the extra torque and dispacement of the 350 makes more hp and puts up lower numbers.

BTW, I even tried a hybrid of the two: I rounded up a big journal 327 crank and the correct 11:1 pistons. Put those in and made basically a 327 cubic inch DZ motor, and ran that a while. That's was a nice combo.

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post #12 of 59 (permalink) Old Mar 26th, 08, 04:25 PM
 
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Smile Re: why did they put a 302 in the Z?

A 327 like a DZ engine is just the 365hp/327 'Vette engine!

Chevy made the 302.

Ford had a 302 already but they fudged and created both the Boss 302 w/ BIG VALVE 351 Cleveland motor heads on it as well as a tunnel-port if I remember right?,

Pontiac created a short decked "303" and AMC had their 304.

I don't think Buick and Olds got in the fray??

And I dearly loved my old junk301 up around 7 to 7,500 rpm grabbing a gear!

It was a real HOOT to me!

pdq67

PS., I think that it is documented back then that TRACO got about 440hp outta their prepped 302's!



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post #13 of 59 (permalink) Old Mar 26th, 08, 05:20 PM
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Re: why did they put a 302 in the Z?

My Dad was Pontiac in the 60's. Lucky for ME the CDN Ponchos had Chevy Drive train. I talked him into getting the 330Hp 327 when he ordered his 4 Dr Sedan 68 Strato Chief. He also ordered the TH400 and 12 Bolt 3.08 Posi. Needless to say I had a very big smile when I drove that car. It was a True Warrior and Sleeper.

I still have that Engine - Slightly Modified with a .030" 4 bolt 010 Block, original Forged Crank, Forged Rods, 11.1 TRWs, Edelbrock Rpm and Holley 750DP, Manley 2.02 / 1.6's and Shaft Mounted Rockers. Sigerson Mechanical Flat Tappet. I figure approx 425Hp. I'm really thinking of putting it my 70Z and selling the BBC.

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Last edited by Z15CAM; Mar 26th, 08 at 05:32 PM.
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post #14 of 59 (permalink) Old Mar 26th, 08, 11:21 PM
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Re: why did they put a 302 in the Z?

How about my factory setup on my 67z - 302, M21 with 4.88 gears?

How would that do? I havent got it together, so I have never driven it, but thats the way it came from the factory.

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post #15 of 59 (permalink) Old Mar 27th, 08, 12:57 AM
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Re: why did they put a 302 in the Z?

Quote:
Originally Posted by GreyShadows View Post
basically a not very street friendly cam) also these engines were primarily backed by a 355 or 410 gears
Not to nit pick, but the cam is very street friendly for me with the stock 3.73's that most of the z's had. It was the standard rear end ratio.

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