[abefromen]

Cam break in was perfect, started first turn of key, never idled, all lifters/pushrods were turning.....

Had to take the intake and valley off for something after break in and just wanted to take the lifters out to look at them for chits and giggles.

Just this one has this small circle pattern on the foot. Completely smooth.

All lifters are NOS GM on a Melling 066. Everything stock including springs.

Is it of any concern?

[steve25]

It’s really hard to say if that’s ok as I have never seen such before !
The main thing it that the lifter bottom is still convex and that it was spinning with just as much rotation as the other lifters are.

If it starts it’s spin later or ends it sooner during a valve cycle, then something with that lifter and or Cam lobe is not well,

[Tim Corcoran]

Lifters are cheap why take a chance buy a new lifter and put a new one in. It looks to me like maybe a factory defect. Take a good look at the cam lobe and make sure nothing is up with that. If the cam lobe looks OK put a new lifter in and be done with it.

[lust4speed]

Please let us know if lifter still has the convex bottom (domed out in the center). Alternative findings would be a flat lifter bottom or a cupped lifter bottom.

[abefromen]

Originally Posted by lust4speed

Please let us know if lifter still has the convex bottom (domed out in the center)

It does. The lobe this lifter is from has a questionable spot on it too. Don't know if its a factory defect or what. I will try to get a pic and describe.

[abefromen]

There is an ever so slight raised area that runs across the width of the corresponding lobe that lifter was on.

I can barely feel it with my finger but it's there.

This has to be a defect in the machining of the lobe.......can't imagine this being there due to some kind of failed break in, especially since it runs width wise.

All other lobes and lifters are perfect and free from any abnormalities.

[Joe's Garage]

It's WAY too much work to do all this over if you don't fix it right this time.

Good luck!

[Tim Corcoran]

It's a good thing that you caught this before you have total lifter and lobe failure so be happy about that. The unhappy part is you now have to replace the cam and lifters. Depending on how long that cam has been in you might try to get the cam company send you a new cam and lifters because this sure looks like a factory defect.

[abefromen]

Originally Posted by Tim Corcoran

It's a good thing that you caught this before you have total lifter and lobe failure so be happy about that. The unhappy part is you now have to replace the cam and lifters. Depending on how long that cam has been in you might try to get the cam company send you a new cam and lifters because this sure looks like a factory defect.

Total run time less than an hour, half hour break in then maybe half hour tune.

Unfortunately, it was bought a year ago and I think I misplaced the receipt.

New cam and lifters already on the way.

[Schurkey]

Is the circle on the lifter bottom in the metal, or is there some lube residue making it look worse than it is? I've seen circular wear patterns on lifter bottoms before, but never one that looked like that.

The mark on the cam lobe looks like the beginning of the clearance ramp. There'd be little spring pressure there.

[abefromen]

Originally Posted by Schurkey

Is the circle on the lifter bottom in the metal, or is there some lube residue making it look worse than it is? I've seen circular wear patterns on lifter bottoms before, but never one that looked like that.

The mark on the cam lobe looks like the beginning of the clearance ramp. There'd be little spring pressure there.

It's in the metal but it's pretty smooth as in can't catch a nail or feel it.......

[Schurkey]

Originally Posted by abefromen

It's in the metal but it's pretty smooth as in can't catch a nail or feel it.......

It'd take a real act of will-power for me to not put it back together and RUN IT.

[dataway]

Looks to me kind of like a tiny piece of grit got momentarily embedded in the lobe and left a trace on the lifter. Probably something dislodged out of the valley pan?

[Kenth]

Originally Posted by abefromen

There is an ever so slight raised area that runs across the width of the corresponding lobe that lifter was on.

I can barely feel it with my finger but it's there.

This has to be a defect in the machining of the lobe.......can't imagine this being there due to some kind of failed break in, especially since it runs width wise.

All other lobes and lifters are perfect and free from any abnormalities.

Looks like the lifter didn't follow the cam lobe all around?

[steve25]

I would put a new lifter in and button it all back up.

You have a new Cam & lifters on the way now, but purchasing one more new one will not break the bank I hope, and you can then return the new Cam and lifters for a refund.

It's just too iffy that the bottom of the lifter does not have more casting flaw issues in it that with added run time would chew up what is a good Cam lobe now .

[abefromen]

Originally Posted by Schurkey

It'd take a real act of will-power for me to not put it back together and RUN IT.

My thought too.........just wondering if that's a good idea or not.

Originally Posted by dataway

Looks to me kind of like a tiny piece of grit got momentarily embedded in the lobe and left a trace on the lifter. Probably something dislodged out of the valley pan?

I agree, and you can see some small debris scuffs on either side of that flaw.

[RocktimusPryme]

Originally Posted by Schurkey

It'd take a real act of will-power for me to not put it back together and RUN IT.

Amen. Its for that reason that I would have never looked at them in the first place. Ignorance is bliss and all that.

As the LS guys say, "Never look at your cam bearings!"

[KEN CROCIE]

Do the other lobes have that ridge across the lobe?

[steve25]

Is that as Ken asked a ridge, or something due to the Camera shot or angle, because in one picture you have there are two ridges to be seen?

[abefromen]

Originally Posted by KEN CROCIE

Do the other lobes have that ridge across the lobe?

No. All other lobes are perfect.

Originally Posted by steve25

Is that as Ken asked a ridge, or something due to the Camera shot or angle, because in one picture you have there are two ridges to be seen?

The light refection makes it appear that there are more than one ridge but there is only one. It's there, I can feel it slightly.

I value eveyone's input and appreciate the comments. I am a bit surprised that some say stick it back in and run it. Believe me that's what I prefer to due not because of the cost of a new cam and lifters, but because I will have to do another break in which I hate doing. This break in went great as all the other lobes and lifters look real nice.

I can run it as is and it may very well be ok for tens of thousands of miles........or it can get worse and fail in a thousand miles or maybe a hundred?

I have learned in the past in these instances that if something doesn't look right it probably isn't. I am leaning towards replacing the cam/lifters unless someone wants to talk me out of it