I have a fully built ls6 stroker. Some of the specs are AFR 215 cc mongoose heads, 1.8 harland sharp rockers LS7 lifters. The cam was an ASA from gmpp. I have about 21k miles on the engine and it seems soon to have this failure. Any suggestions?

 

Low spring pressure, high rpm, lifter launch?
Spring coil bind?

 

Failed lifters are usually a symptom of an underlying issue. I'm not a fan of using 1.8 rockers on a cam designed for 1.7 ratio. This doesn't just increase lift but speeds up the rate at which the valve opens and closes, which could be too violent for that lifter and/or valve spring.

 

What springs and pushrods? Those HS rockers are great, but heavy, requiring a lot of spring to control, and therefore also needing alot of pushrod to avoid flexing and pole-vaulting. That thing looks like it had the **** beat out of it before it scrubbed the cam.

 

Kinda looks like when I ran some cheap chinese lifter trays one time, the lifters would spin in the bores and made lines just like that on the lobes. And of course destroyed the lifters and cam...
But like others have said you need quite a bit of spring for your setup

 

You had a roller issue that manifested into what you have now. That was run a good while messed up before it did that.

 

I'd think you'd need to hot tank that engine to get it clean and then rebuild.

 

if its a valvetrain compatability issue could it really take 20000 miles to show up

 

If the spring were barley strong enough to begin with.... yes