What caused this camshaft wear pattern

[HawkRod]

Your lifters may not have been rotating. The cam will partially rotate a lifter with every stroke. This must happen or you will get cam wear. Check lifters in the bores and see if there were any burrs or issues there. Without a cam in the block, they should just glide right through the bore and out the other side. The lifter bores in an engine are CRITICAL to making sure a flat tappet cam lives.

 

[70rrclone]

Thanks, I'll check that while its apart.

 

[padam]

I guarantee mine were rotating and I got the same wear. My guess is the modern materials are not up to the task of high spring pressures.

 

[Rebelrouser]

It was broke in with driven breakin oil and mostly valvoline vr1 10-30 oil. I think I did one oil change with amsoil 10/30 high zinc oil. Filters were wix . Ive never seen a failure like this. Im going to a solid roller and I want to make sure my bases are covered.

Cam or lifters are not machined properly; there is no rotation of the lifter. I have seen this on dozens of engines last couple of years. You can use any oil you want but on a flat tappet cam if the lifter does not spin on the cam lobe as it rotates it will simply not last. And I made the same decision you did several years ago, just run a roller and be done with it.

 

[OKDart]

Thanks, I'll check that while its apart.

Here's the procedure from Hughes, starts on page 2.

https://www.hughesengines.com/Upload/productInstructions/camshaft_instructions_Mar_2016.pdf

 

[4mulas]

Ill contact comp and see what they say. It already out. Its going to be disassembled inspected cleaned and reassembled. It going back together with a bullet solid roller

View attachment 1969681

Please post pictures of the bottom of those 2 lifters on the lobes in question when you have it apart.
I don’t think the wear pattern across the top is really the concern here, just the chips correct? Which would be core manufacturing issues, debris or something. Regardless, yes it needs changed for sure.

 

[padam]

FYI, reference info
Thread 'Looks like my cam and lifters are wearing out'
Looks like my cam and lifters are wearing out

 

[Cranky]

Yup....don't forget to use the correct intermediate shaft with a roller....solid or hydraulic.

 

[70rrclone]

Yup....don't forget to use the correct intermediate shaft with a roller....solid or hydraulic.

Im probably gonna go with a composite gear for the intermediate shaft.