The guide slots may have been lengthened for 1.65 rockers, but they are worn excessively on the sides as well.
The studs appear to be Pioneer or Isky.
The 326/389/first design 400 use a shorter rocker arm than the later 14 deg. engines, although people have used them.
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION
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