Janah---It would probably more costly to get your rockers rebushed than
purchasing new (stock) ones. Take a look at the rocker shaft, as these usually
wear out quicker than the rockers. (Measure the shaft, or move the shaft down
into an unworn area to see if it feels less loose). Stock rockers can give many
miles of good service, and are a good bet. As others have wrote, the rollers
are mostly for changing the ratio, and or part of a high performance cam
go-along. There are some side benefits for these that can reduce valve guide
wear.
I'm guessing that the "clatter" you hear is not really "tappet" or cam follower
noise, but some looseness in the rocker and shaft, along with flattening in the
face of the rocker tips. Check the valve lash to be sure you can't adjust out
of this.
The pedestals can last "forever". And the springs between the rockers can do a
good job. Spacers in their stead do little if any to improve performance.
Marketing claims for these spacers say they reduce friction. I would think
keeping the rocker tip to valve stem more consistant and would be a more valid
point for race engines. I have no way of proving or disproving any of this
rambling!
Dick
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