My Christmas present came early

[Kahuna]

This is a regrind on an original Ford core. The valve is not tight, the lifter moves freely in the bore. Seat pressure is 80#, Isky 185G springs. It is the lifter, I'm sure.

 

[Ross F-1]

This simply isn't true. When camshaft s start to go flat they don't all simultaneously go out .I have been a certified auto tech for 28 years and we used to see this happen all the time in the 80s before roller valve trains were common.

Those would be OHV engines, right?

The hardening is already gone from both the lifter and the camshaft .a test will not give you any idea why it happened.

Agreed, but testing others might be instructive.

...There is a low probability the cam was at fault ,although there was a string of this in the 90s .is this a regrind or new core?

With it being a regrind, it will cloud the picture (warranty-wise). Surface finish and hardness of the cam surface could be factors.

 

[Beecher]

i know this is an old post, but i just noticed you had isky 185g springs. I had a problem with them when i first ran my motor. they all started out at the same length, but within a few hours of driving, some issues started to occure. I pulled the intake, and found I could turn some springs by hand. Took them all out, and 3 of the springs had started to collapse, one of them nearly 1/8 of an inch. Could a collapsed spring cause this damage? From uncontrolled slamming around on the cam?

Sorry to hear!

 

[KiWinUS]

80lb = too much pressure !!!

 

[joel]

Sorry for the situation. I had 2 cams from Crane with a bad heat treat; they replaced the cams , but the rest of the damage falls on the installer or owner. I hope the collateral damage is minimal.