Camaro Research Group Discussion > Originality
Questions about "O" Rockers 3974290 for 69 Z/28
Bryan302:
I have decided to go with a "140" cam instead of the "346" cam. I have everything NOS, including the 3927142 valve springs, retainers, valves, etc. My question is.. Are the 3974290 "O" rockers arms good enough to be compatible with and intended to be used with the "140" cam?
If a person were to build a set of 3974290 rocker arms from the current sources of NOS parts, ebay, camaro shops, etc. Would he still get the same "O" rocker out of the current 3974290 box? Are they still made the same, heat treat, hardness, etc. Do the new ones still have the "O" on them?
Does anyone know if the new replacement part number of 10089648 gets you an "O" rocker? My dealer says that the 10089648 is a direct replacement for the 3974290, but I kinda doubt it!
What aftermarket brand such as Crane or Manley, with the part number, would replace the "O" rocker?
Please advise and suggest.
Thanks,
Bryan
Kelley W King:
I think I read Jerry M,s Z turns 8600 rpm with stock rockers. You might want to contact him.
68Zproject:
http://www.camaros.org/forum/index.php?topic=6862.0
BillOhio:
Bryan do you have stock retainers or the aluminum ones?
Bryan302:
Hi Bill,
I have the steel retainers, pn#14003974 for the 3927142 spring. By the way, I noticed a notation under the listing of the 3927140 cam in Hooper's book, in the parts listing in the back. It stated to use thrust bearing 3887871. Do you know if this bearing is critical to the use of a 140 cam? Exactly where is the bearing used, is it a type of cam bearing or like a cam button for the timing gear? As you can tell, I never heard of it. Thankful for any help!
Thanks,
Bryan
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