i've got some strange markings on one of the lifters in my pontiac 400.
the bottom one in this pic looks different than the other 15.
the wear pattern is longer and there is a slight rifling on it, almost like it's ribbed.
it mic's the same as the rest.
WHAT IS THIS FROM?
this is in a mild 400 build.
rv cam about 218 deg and .458 lift. or so
roughly 10-12k miles
i have some lift noise in the motor when the motor is coming down off the revs and only at about 1000rpm.