Author Topic: 0 rocker arms BIG or small 0 ? differences?  (Read 6258 times)

zman1969

  • Member
  • ***
  • Posts: 124
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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

  • Member
  • ***
  • Posts: 124
    • View Profile
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?
Rich

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

69Z28

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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.
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

JohnZ

  • CRG Member
  • *****
  • Posts: 4262
    • View Profile
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
CRG

69Z28

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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.
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

x77-69z28

  • Hero Member
  • *****
  • Posts: 845
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 1144
    • View Profile
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
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

68camaroz28

  • Hero Member
  • *****
  • Posts: 1144
    • View Profile
Re: 0 rocker arms BIG or small 0 ? differences?
« Reply #8 on: May 02, 2013, 02:39:21 AM »
One More:
TRW rocker
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

  • Hero Member
  • *****
  • Posts: 1212
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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

\

GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

canadair

  • Member
  • ***
  • Posts: 97
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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.
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28

jdv69z

  • Hero Member
  • *****
  • Posts: 722
  • 69 RS Z/28 52E
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 889
  • 69 X33D80 Z28
    • View Profile
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?
GaryC

'UNRESTORED' 1969 Cortez Silver X33D80 Z28