Hi Phil,
A good choice for a 1.5 ratio street rocker is the forged, plain bearing
rocker formerly manufactured by Keith Dodd. I see that APT still
advertises them, and Seven Enterprises has them also, although there
isn't a picture. I would think the additional wear on #8 rocker is a
result of the shaft being cantilevered off of the pedestal and bending
the shaft. The competition rocker shaft was developed to prevent shaft
breakage from the grub screw hole at the front, the solution being
moving the grub screw to the second pedestal where it has better support.
http://www.7ent.com/detail.cfm?pageid=2786
John
Phil Nase wrote:
>Thanks everyone for all the advice. I'll just stay stock for now.
>
>I asked because during my last valve adjustment I saw my #8 rocker was
>wobbling laterally. The pedestal was solid. The others seemed fine.
>
>Worn shaft? Why only on the back end of the shaft?
>
>
>Phil Nase
>http://home.comcast.net/~philnasecpa
>
>
> Phil,
>
>I have not dealt with this seller, but I have looked at a lot of this type
>of rocker arm, usually with needle bearings at the pivot as part of my old
>job. The roller tip does not help as you would expect, it usually has too
>much friction on the ID to roll and slides across the valve tip. To make
>matters worse, the OD curvature is much tighter than the normal rocker tip
>which leads to valve stem pitting from higher contact stresses. The lower
>stiffness of aluminum vs. steel also makes me think these may be more
>flexible than the stock rocker.
>
>I am not convinced that they are worth the money.
>
>Mike Myers
>Former Torrington engineer
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