Author Topic: 0 rocker arms BIG or small 0 ? differences?  (Read 5923 times)

zman1969

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0 rocker arms BIG or small 0 ? differences?
« on: April 24, 2013, 01:50:21 PM »
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?
Rich

69 RS/Z DZ302 Daytona bumble bee
69 T/A clone LS6/6sp
69 Nova SS 396

69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #1 on: April 24, 2013, 02:08:59 PM »
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?
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

zman1969

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #2 on: May 01, 2013, 12:33:19 PM »
anyone else have any more info?

69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #3 on: May 01, 2013, 02:23:23 PM »
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.

JohnZ

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #4 on: May 01, 2013, 02:48:51 PM »
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.
'69 Z/28
Fathom Green
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69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #5 on: May 01, 2013, 05:46:03 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.

x77-69z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #6 on: May 01, 2013, 11:54:21 PM »
Yes
69 x77 burnished brown, 711 int 05A bought in 78
67 rs/ss 350 butternut yellow 4 speed 2nd owner
70 Z28 forrest green, green int, M40, bk vinyl roof PROJECT
99 SS hugger orange 6spd NO TTOPS bought new 1 of 54
11 cts-v blk diamond  edition wagon 556hp sick!

68camaroz28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #7 on: May 02, 2013, 02:35:12 AM »
Umm, let's see some O's.....

70 Z/28

72 LT1

11A 69Z small O sideways

Mixture of O's

\
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
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67 L89 Corv Tribute
68 Corv 427/400 Orig motor
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68camaroz28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #8 on: May 02, 2013, 02:39:21 AM »
One More:
TRW rocker

tmodel66

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #9 on: May 02, 2013, 02:45:16 AM »
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.
Daniel  
'69 SS 350/4 speed  Fathom Green--POP

69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #10 on: May 02, 2013, 03:20:12 AM »
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

\


canadair

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #11 on: May 02, 2013, 09:38:59 AM »
the rockers with the triangle are they also high performance rocker arms ?

69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #12 on: May 02, 2013, 01:00:34 PM »
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.

jdv69z

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #13 on: May 02, 2013, 01:06:56 PM »
Here's my original set.
Jimmy V.

69Z28

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Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #14 on: May 02, 2013, 01:38:42 PM »
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?