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Author Topic: 0 rocker arms BIG or small 0 ? differences?  (Read 4211 times)
zman1969
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« on: April 24, 2013, 08:50:21 AM »

I just bought a set of 0 rockers for my 302 and a few of them have a different style 0 some large and some small - I was wondering what the difference was if any?
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Rich

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« Reply #1 on: April 24, 2013, 09:08:59 AM »

From what I have read recently the big O were fefore 69 and the small O was 69 and after. As for material differences I don't believe there are any.


I just bought a set of 0 rockers for my 302 and a few of them have a different style 0 some large and some small - I was wondering what the difference was if any?
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
zman1969
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« Reply #2 on: May 01, 2013, 07:33:19 AM »

anyone else have any more info?
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Rich

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« Reply #3 on: May 01, 2013, 09:23:23 AM »

I found where I read it. If you have Jerry M's revised 4th edition Definitive book on page 26 there is a pic of both versions of the 'O'. It says research shows the 67 Z28 had the larger 'O' than the 68 and the 69.
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
JohnZ
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« Reply #4 on: May 01, 2013, 09:48:51 AM »

Chevrolet used 240,000 stamped rocker arms EVERY DAY; it's highly unlikely that there was only one supplier or one set of precision progressive-die tooling.
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'69 Z/28
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« Reply #5 on: May 01, 2013, 12:46:03 PM »

At least that explains why I have a few rockers with the 'O' horizontal, vertical, small and large. Wow. Can I assume they were mixed this way on a given engine?


Chevrolet used 240,000 stamped rocker arms EVERY DAY; it's highly unlikely that there was only one supplier or one set of precision progressive-die tooling.
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GaryC

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« Reply #6 on: May 01, 2013, 06:54:21 PM »

Yes
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68camaroz28
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« Reply #7 on: May 01, 2013, 09:35:12 PM »

Umm, let's see some O's.....

70 Z/28

72 LT1

11A 69Z small O sideways

Mixture of O's

\
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Chick
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68camaroz28
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« Reply #8 on: May 01, 2013, 09:39:21 PM »

One More:
TRW rocker
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584
tmodel66
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« Reply #9 on: May 01, 2013, 09:45:16 PM »

Has anybody ever saw an O with a line thru it? I've got a set in a box in my shop. I replaced them with Crane's cause they are in a Crane box. I can't remember what they were for though.
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Daniel  
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« Reply #10 on: May 01, 2013, 10:20:12 PM »

Exactly what I have too.



Umm, let's see some O's.....

70 Z/28

72 LT1

11A 69Z small O sideways

Mixture of O's

\

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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
canadair
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« Reply #11 on: May 02, 2013, 04:38:59 AM »

the rockers with the triangle are they also high performance rocker arms ?
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69Z28
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« Reply #12 on: May 02, 2013, 08:00:34 AM »

Honestly,don't really know anything about them. Mostly installed on low performance engines. Just a guess though but probably didn't get a process that the 'O' rockers received.
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
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« Reply #13 on: May 02, 2013, 08:06:56 AM »

Here's my original set.
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Jimmy V.
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« Reply #14 on: May 02, 2013, 08:38:42 AM »

Just out of curiosity, I have heard it's best to keep the same pivot ball to the same rocker. Are there any exceptions or is it a must to get new pivots? Mine are all mixed up in a box, all look fine with no blueing, cracks, galling or score marks. I'm using roller tip stamped steel 1.5's at the moment and probably will continue using them when I finally pull the 350 and install the 302, but what if I did go back to the 'O' rockers?
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GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28
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