Ruined cam - how?

[farmtruc]

Pushrods are good, no wear on them, they are straight.

All I can think of is this car may have experienced a lack of oil at some time.
The owner did buy this car used, he said it always had some going on with it and now this. Maybe the oil pump died at one time, who knows.

thanks guys,
allen

[GasGuzzler]

Too long of pushrods would hurt the plunger in the lifter, the rocker arms, the valves....something else. This was a soft cam and the wear broke the lifter.

[txarkitekt]

Coil bind or excessive spring pressure can cause that type of failure.

First thought...

....that is what leads me to believe it is a lubrication issue.
Could be like RED said.....regrind cam....along with incorrect pushrods and coil binding. Let us know what you determine!

Second thought...dammit guys--got to this post before I could say something--but good advice! Yes, on a regrind, the heat treat on the lobes make it harder--and with it being ground off in certain sections, it makes it susceptible to ruining the roller on the lifter. I saw this happen to Alan's cam when we tore down his motor...the cam lobe got flattened out because of oil starvation (because the lifter was not articulating up and down properly) and the roller from the lifter just sat on the cam lobe and it mushroomed the lifter.

This was a soft cam and the wear broke the lifter.

Exactly. Regrind cam...ruined lifters. Also a possibility of lubrication starvation at some point. I now honestly don't think there was excessive bind from the valve springs or wrong sized pushrods. It has all to do with a soft cam (and it having the XER lobes which = high ramp rates) and ended up messing up the lifters. You are going at it the right way Allen... If you are doing an LS6 cam, the P springs may be too much...good call on the LS6 springs or 918s...

[ducky]

You sure tyler didn't get ahold of this project allen?



haha nahhhh whey I jus playin