Well my 408s lifters gave up the ghost and I'll never buy another ls7 lifter but anyway recommend a lifter for around a 7200 rpm that I won't be replacing every 10k. This has been a bad night.

 

I was recommended the Morel 5315s by Tick.

 

Can you tell us a little bit more about the valve train?

 

If you want to run high RPM reliably I wouldn't get cheap cast body lifters. You're going to have to spend north of $500 to get good ones. The Morel 5206 are good although you don't have to have link bars if you replace the trays. I trashed my motor with "Street" lifters when the cast body shattered. I was amazed at how brittle they were. I found out talking to tech support that they do not recommend running over 6,200-6,400 RPM too. The higher end ones use billet bodies. The cam, geometry, preload, springs and valvetrain weight all need to be dialed in too.

 

Sorry you had a problem and I am NOT saying LS7 are great but a LOT of folks use stock lifters beyond 6400 and the LS7 turns over that stock. More to things than rpm.
You likely had another problem that caused this.

 

A good read on lifters http://www.yellowbullet.com/forum/sh....php?t=1147938

 

I'm not sure on the weights of things but the heads are PRC 247s with the new PAC 700 springs. 251/259 .624/.624 cam with stock rockers with the trunions The lifters that failed were orginally in my stock bottom end ( had maybe 8k miles on them) so I put them in the 408. When the lifters were put in the stock motor the guy that did the install stuck the stock length pushrods in (needed 7.475 with the set up) and it was ran that way for a while. Ended up beating up the valve tips and rockers so I replaced those and never thought anything about the lifters. I assume thats what killed them. I've actually got a set of LS7s I'm considering giving a try. I'm just afraid.

 

Ya, I've heard that from many people but it wasn't with a crazy cam, I don't rev up past 6,400 (fuel cut off 6,500), my preload, geometry, spring pressures and everything else was dead on. The roller pin came loose, moved over, jammed against the bore hole on the upstroke and cracked the roller off on start up. It went around and smacked another lifter which 'shroomed and jammed that one. The jam broke the timing chain which then smacked 9 valves. The original roller broke the cam sensor and wedged itself in the cam sensor hole.

Do people run them higher than that. Yup but it's not recommended. I think the thing that might have gotten your attention was after I got them out I tried to press the cracked part of the body back into position and on the slightest movement the pieces would snap off. The metal is very brittle and obviously cast as it has that granular look. From what I've been able to gather the cheap ones are Chinese cast and American finished. The higher end are billet steel. A couple hundred bucks ended up costing me thousands. Take your choice and take your chances.

 

Lots of guys have noise and crap but catastrophic failure like you saw is rare.

 

A lot of offshore boating guys use the Morels. They beat the tar out of them compared to a car on the street. Chris Straub can probably provide more information.

 

These are what I ordered. It's a morel 5206 with lunati stamped on it.
http://www.ws6project.com/user_stor/catalog/Lunati-72437-16/

 

All day long. 200/500lbs at .750 lift.

 

Are we talking a morel drop in lifter or the link bar set up?

 

This is the link bar setup