F/T cam with tool steel lifter

[Superstock1976]

Bolt pattern is the same

I just tried it and there different pattern is smaller.

[Tom68]

Factory roller bolt pattern is on a smaller base circle.

[turbo camino]

The OE stepped nose bolt pattern is smaller than the older or retrofit roller pattern.

[CamKing]

Bolt pattern is the same

I just tried it and there different pattern is smaller.

OK, then those were made for an OEM Hydraulic roller block, with the stepped front journal.
I didn't see that in the description.

[Tuner]

It looks to me, that the cam was too far forward in the block, or the cam had too much taper.
Look at the wear patters on the lobes. To me, it looks like the contact area is moving off the side of the lobe.

Is the radius on the lifter face incorrect for the angle of the cam lobe?

[sjre]

I recently saw I think it was Billy Godbold who said it happens from fracturing under the surface hardness then it separates and flakes .

[tuffxf]

Gday,
My two cents, you should have been fine, make sure the cam lobe is sitting in the right spot as Mike has said, lose the tool steel lifter and use a good edm old school lifter and don't nitride it what ever you do.
You have nothing binding at full lift?
What oil?
Cheers

[BCjohnny]

I recently saw I think it was Billy Godbold who said it happens from fracturing under the surface hardness then it separates and flakes .

Increasingly the ability to not understand the material limitations of what the designer is dealing with seem to come to the fore .......

Creme Brule

[Stingr69]

I recently lost a cam just the same way. Had it apart at 1k miles for a different reason and found mine a little less damaged that the OP's cam. Howards solid FT cam and Howards EDM lifters. They were completely uninterested in seeing the damage when I called them about it. Blamed the break in oil. I suspected maybe too much over the nose spring pressure. Who knows? Lifters were not damaged so I had Powell Machine resurface them so maybe reuse them some day. Quite a few lobes showed damage.

20230510_103654.jpg

[Arthur]

Break in oil on flat tappets is the greatest marketing deception since ZDDP

[CamKing]

Break in oil on flat tappets is the greatest marketing deception since ZDDP

Do you want to elaborate, or just make ridiculously false statements, with nothing to back it up?

[CamKing]

Blamed the break in oil. I suspected maybe too much over the nose spring pressure.

In most cases, the issue is too much spring pressure over the nose.
We recommend the spring pressure at max lift to be between 240-280#.
When running these break-in pressures, and PennGrade1 30w break-in oil, we see a 99+% success rate.
Some people get away with running more pressure, or regular oil, but they're taking a big risk.
Almost every break-in failure I've seen, was because the spring pressure was too high, or they went with the same synthetic oil they normally run.
The last one we lost, the engine builder told me he didn't believe in lowering the spring pressure for break-in. I wonder if he believes in it now.

[Stingr69]

Cam was broken in on single spring. Over the nose was around 350# final (per the numbers) with both springs installed. Put a hydraulic FT in for now, but NO JOY. Going back to solid FT when I get some free time.

[Steve Salesky]

Blamed the break in oil. I suspected maybe too much over the nose spring pressure.

In most cases, the issue is too much spring pressure over the nose.
We recommend the spring pressure at max lift to be between 240-280#.
When running these break-in pressures, and PennGrade1 30w break-in oil, we see a 99+% success rate.
Some people get away with running more pressure, or regular oil, but they're taking a big risk.
Almost every break-in failure I've seen, was because the spring pressure was too high, or they went with the same synthetic oil they normally run.
The last one we lost, the engine builder told me he didn't believe in lowering the spring pressure for break-in. I wonder if he believes in it now.

AM curious would you recommend a lower spring pressure range for break in using a 1.73 rocker ratio vs a 1.5 ratio?

[CamKing]

AM curious would you recommend a lower spring pressure range for break in using a 1.73 rocker ratio vs a 1.5 ratio?

Yes, you would want to be closer to the 240#, than the 280#
Shoot for 230#-260#