Good info.Thanks.

Here's another tidbit - even though an extreme psi + rpm difference, but a lot shorter time period, Warren Johnson had mentioned his valvesprings where proven to hit 700*F by the end of a 1/4 run. Yeh, that's a wholly crap !

Everyone looked at MT's link earlier where it had graph's showing psi lost vs heat increase right ?

they probably limited the oil to the top end.I've had lifters that did that.chit got real hot,quickly.

I think I've heard of those lifters. Doh !

Ive recently learned howards has really stepped up their game to the next level in the cam department. Lobes are spintron tested as well.

I hope their lifter quality has improved. I can't unequivocally say they were bad but, they didn't perform like I was hoping. When I bought them they told me they were Morels. Maybe I got a bad set.

I had a solid lifter go bad on an engine two years ago on my 138631 cam. I caught everything before there was a catastrophic failure but still had to replace the cam and lifters. They lasted about 200hrs but the Comp lifters that were in the other engine were fine. I would normally go 250 hrs with Morel/Comp/Crane lifters before changing them. They were less expensive than the competitors lifters at the time I purchased them but the heat treat process they were using is I chose to try them back then. When all said and done, I wound up replacing the lifters on both engines with Isky Red Zone's.

Howards race and promax hyd roller lifters are made by morel.

http://www.competitionproducts.com/m.../#.Vs3yKHTnZnE

After some back and fourth I ended up buying a cam from Jones. Only company that had a reasonable turn around time. It's difficult to get 55mm cores with small lobes.

That's what they told me when I bought them but still had the failure. One lifter hammered the bearings out of it and 3-4 other were on their way out. I ran the same setup since 2007 without other issues.

Cool. Looking forward to how it works out.

I dont know what they were using 10 years ago. Im talking about today.