Comp Cam/lifter failure
I’ve removed two cams from motors that had lifters that looked like that.
One was an Edelbrock cam from a SBC that only had one lifter like that.
The other was a “white box special”(no name/no numbers on it) that had a few like that, that I took out of a 360.
I never checked the one out of the SBC, but the one from the 360 had almost no lobe taper.
The lifter in the OP looks like it never rotated........ which should have been picked up during the valve train assembly process.
There’s obviously no problem with the hardness of the cam or lifters, or the oil being used.
If there were, there’d be a hole in the lifter.
The amount of lobe taper for a typical performance cam is .0015-.0020.
A couple years ago I had a customer with a 455 Pontiac who had a rod bearing issue on a rebuild at about 50 miles.
Pulled the motor apart and discovered a lobe going away on the new summit cam.
He brought it over and I mounted it up in the lathe and checked the lobe taper. None of the lobes had more than .0010”.
I had a Comp ground for it, and had it nitrided.
It had .0020” lobe taper....... and I had him verify lifter rotation during assy(all rotated), no problems with that one.
I’ve removed two cams from motors that had lifters that looked like that.
One was an Edelbrock cam from a SBC that only had one lifter like that.
The other was a “white box special”(no name/no numbers on it) that had a few like that, that I took out of a 360.
I never checked the one out of the SBC, but the one from the 360 had almost no lobe taper.
The lifter in the OP looks like it never rotated........ which should have been picked up during the valve train assembly process.
There’s obviously no problem with the hardness of the cam or lifters, or the oil being used.
If there were, there’d be a hole in the lifter.
The amount of lobe taper for a typical performance cam is .0015-.0020.
A couple years ago I had a customer with a 455 Pontiac who had a rod bearing issue on a rebuild at about 50 miles.
Pulled the motor apart and discovered a lobe going away on the new summit cam.
He brought it over and I mounted it up in the lathe and checked the lobe taper. None of the lobes had more than .0010”.
I had a Comp ground for it, and had it nitrided.
It had .0020” lobe taper....... and I had him verify lifter rotation during assy(all rotated), no problems with that one.
