What lifters should I use?
What lifters should I use? Just wondered if my stock lifters(40K on them)would be ok to use on my rebuild? My setup consists of forged pistons/ rods, ARP rod/ main bolts, new oil pump/ LS2 chain/ TREX cam/ Patriot dual spring kit/ machine shop is porting my stock heads and installing REV 2.02/ 1.60 valves. Should I bust out $200 or more for new lifters or just reuse the stock ones? I plan on N20 in the 150-200 shot level down the road too...so I definately would say this new setup will see some decent RPM's every now and then. Also what should I shim the springs too or do I need to do this at all....I'm not milling the heads unless they need it and I already have 7.4 TR pushrods. Help me out...I don't want to bust a good engine right off. This is on a M6 w/a 12 bolt and 410's. Thanks!!!
well if youve replaced everything else in the motor, I would go ahead and upgrade the lifters. You can go with the comp R lifters, but that would mean you would also have to get adjustable rocker arms. On the other hand you can get the morel(sp) lifters, and theyre no as sensitive to preload (you can use non adjustable rocker arms) as the comp R's, but cost more.
I'm running stockers with a 242/610 lift cam and they work fine. I'd definitely go with a new set though. Have you seen what lifter failure can do to a motor? Email valvegod@aol.com for a great price on new stock lifters.
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I don't mind to shim valve springs but I realy want to keep the stock rockers. I don't want to have to buy adjustable rockers right now. Will Comp R's still be ok for me considering this? Please let me know so I can make a purchase and get this motor in my car this week. Who has the best prices from our sponsors on lifters? Or if anyone has a good set for sale I'd consider that too! Thanks in advance.
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Verdad Gallardo So I should just pay up and buy Morel lifters so I won't have to do this...seems to be less expensive versus buying adjustable rockers and then the valve float issues I read about on here with aftermarket rocker? Just looking for a good safe setup without breaking the bank. Could I buy just the regular Comp lifters or is this a timebonb waiting to happen? Thanks for being so helpful on this issue!!!! If this was your motor what would you do?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
If this was my motor, I would get Comp "R"s and have adjustables professionaly installed (I would make sure that a wipe test is done for proper geometry and then have the preload set according to specs with measurements hot)
Originally Posted by 3rdgenguy
if you are going through the trouble of a rebuild dont skimp on the little things man!!!!!!!!!!!!!!!!!. These tiny items usually show up on down the road 
Hmm, I thought you could set the preload with Comp R with stock rockers? Not that anybody has been successful with this it seems.
Would Comp's Adjustable Shaft 1.7 Roller Rockers and Comp Rs outperform the Morels with stock rockers, or provide more stability/reliability? Or would it be better to go with Morels and a non-adj rocker like the Jesel SS?
Would Comp's Adjustable Shaft 1.7 Roller Rockers and Comp Rs outperform the Morels with stock rockers, or provide more stability/reliability? Or would it be better to go with Morels and a non-adj rocker like the Jesel SS?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
For high rpm stability, you bet, but shaft rockers require a spacer = mo money.
With a cam like T-Rex, you want your preload to be on the dot, not just close enough. I wouldn't use non adjustable rockers.
Do you realise that this is one of the biggest cams you can stuff in there? Like Extreme max effort (so far that is).
We are not talking about a 224 where a little less or more preload will be forgiven by the lifters.
With a cam like T-Rex, you want your preload to be on the dot, not just close enough. I wouldn't use non adjustable rockers.
Do you realise that this is one of the biggest cams you can stuff in there? Like Extreme max effort (so far that is).
We are not talking about a 224 where a little less or more preload will be forgiven by the lifters.
I am decenty mechanically inclined....I'm not afraid to work on my car at all. But...what is the proper way to set preload with comp R's and say adjustable rockers? I've just heard so many bad stories on valve float when you mess with aftermarket rockers. Or are they just buying crappy rockers?
Originally Posted by SSBLUBYYOU
I am decenty mechanically inclined....I'm not afraid to work on my car at all. But...what is the proper way to set preload with comp R's and say adjustable rockers? I've just heard so many bad stories on valve float when you mess with aftermarket rockers. Or are they just buying crappy rockers?
IMO spring rates and ramp rates have more to do with what lifters are required than duration or gross lift.
The problem is in the non-adjustable style rockers like the Yella Terra's and the Harlan sharps. I haven't heard any complaints on the Comp or Jesel adjustable rockers. When it comes to the lifters themselves, Morel will be the best you can get. There's a reason they cost $300 more than a Comp R. If you used the comp R's, they require little to no pre-load. That's just how they are designed to operate. I have a new set of Crane's FS if you may be interested in them.