Author Topic: Rocker Arms SBC with "O" on the end  (Read 5559 times)

opelitis1

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Rocker Arms SBC with "O" on the end
« on: April 30, 2008, 05:28:11 PM »
Small block rocker arms with the "O" on them... I have heard that these are better than the more common "V" type...   Why???  I have maybe 15 of these O arms and cannot see any difference..
Maybe it is my vision, eh???   Ted

firstgenaddict

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Re: Rocker Arms SBC with "O" on the end
« Reply #1 on: April 30, 2008, 08:25:51 PM »
The slot in an O arm is supposed to be longer for the high lift cams.
James
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PACE&Z2869

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Re: Rocker Arms SBC with "O" on the end
« Reply #2 on: April 30, 2008, 08:28:35 PM »
I believe the "o" stamped rockers are a long slot rocker for higher performance engines. The newer rockers are also long slot as GM probably wanted to standardize a p/n. As opposed to the older low performance rocker arm which wasn't a long slot. Higher lift camshafts required a long slot rocker.
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opelitis1

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Re: Rocker Arms SBC with "O" on the end
« Reply #3 on: May 01, 2008, 09:48:48 AM »
How old are these "O" Rocker arms and were they in fact specific to a certain engine or car model???  I've had them for 10 years and the person I bought them from must've had them for maybe another 10 years B 4 me....  In the olden golden days, what did we in fact consider a "high lift" cam????  Anything over .450 and were they used in "solid lifter" cams only??? 

JohnZ

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Re: Rocker Arms SBC with "O" on the end
« Reply #4 on: May 01, 2008, 03:42:04 PM »
The "o" rockers are also heat-treated differently for durability; the lash clearance on solid-lifter engines is much harder on the rockers than the constant zero-clearance of hydraulic lifters.
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opelitis1

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Re: Rocker Arms SBC with "O" on the end
« Reply #5 on: May 01, 2008, 04:30:29 PM »
Good info Mr JohnZ... Had these for sooo many years and basically never knew what I had or why and what they were used on....   Merci!!!  Ted

 

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