Help me pick a lifter.
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Joined: Jan 2010
Posts: 2,317
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From: Hurley, VA
Help me pick a lifter. 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.
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.
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.
You likely had another problem that caused this.
Joined: Aug 2007
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From: Turnin' Wrenches Infractions: 005
Thread Starter
10 Second Club
Joined: Jan 2010
Posts: 2,317
Likes: 20
From: Hurley, VA
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.
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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.
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