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  #1 (permalink)  
Old 06-23-2008, 03:11 PM
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How do my lifters look?

Got the heads off and just wondering how my hydraulic lifters look in terms of wear? What can you gurus tell me about how my cam is doing, etc?










Thanks,
Ian.

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Old 06-23-2008, 03:21 PM
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What kinda mileage on the motor ,,is it a Stocker..? a mild buildup with cam,aftermarket springs..? the top lifter looks normal, the next 2 look like improper break-in, or excessive spring pressure wear.
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Old 06-23-2008, 03:22 PM
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THe one with the brown skid mark looks weird to me. Like it is not spinning like it should in the bore.
I am no guru though.
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Old 06-23-2008, 03:23 PM
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Yeah the straight mark indicates that the lifter is not spinning on the lobe. It is too late to do anything about it though. Probably had the lash too tight.
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Old 06-23-2008, 03:25 PM
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Quote:
Originally Posted by Double_v23
Yeah the straight mark indicates that the lifter is not spinning on the lobe. It is too late to do anything about it though. Probably had the lash too tight.
Are you talking about the straight oil mark in pic #2?

The engine hasn't been run for a couple of weeks, if that could have any bearing on things?
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Old 06-23-2008, 03:27 PM
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Quote:
Originally Posted by Dqracer
What kinda mileage on the motor ,,is it a Stocker..? a mild buildup with cam,aftermarket springs..? the top lifter looks normal, the next 2 look like improper break-in, or excessive spring pressure wear.
6k miles on the engine. Mild build-up (Performer RPM cam, Performer RPM intake, 600cfm carb, iron heads). Not sure what springs are in the head, but they're singles with dampers.
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Old 06-23-2008, 03:55 PM
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If you feel like you need new lifters. that would be your call. why do you have the eng back down with so few miles? lifters are cheap.
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Old 06-23-2008, 03:59 PM
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Quote:
Originally Posted by FEDDO
If you feel like you need new lifters. that would be your call. why do you have the eng back down with so few miles? lifters are cheap.
Over-heated and decided to pull the heads to get them check over (although cylinder compressions were OK). Also a good opportunity to clean and inspect as I've only recently acquired the car.

Won't be installing new lifters... lifters are cheap, but a new cam and damage caused by flattening lobes isn't. Heard too many horror stories of changing lifters without changing the cam.

So, do these lifters look 'OK'? Does my cam look in good shape judging by the wear on the lifters?
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Old 06-23-2008, 04:50 PM
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Looking at the lifter from the side while holding it straight up and down, lay the edge of a steel rule across the face where the cam lobe rides. The lifter should have a very shallow crown to it. If you can see light on the edges, they are probably still ok. If you can see no light at all or light only in the middle of the face, they're toast.
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Old 06-23-2008, 04:56 PM
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The lifter in the second pic is toast. The center is worn. The discolouration indicates excessive heat. The cam lobe is likely toast too.
You can tell of the lifter is good by holding two together face to face.
You should be able to rock them together as the lifter face is convex, not flat.
Any flat faces are trash.
Time for a new cam + lifters. Check your springs for proper pressure, check all lifter bores. Use GM EOS or other ZDDP additive in the oil.
reduce the spring pressure for breakin if its more than 115 seat and 320 open.
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Old 06-23-2008, 05:56 PM
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V8hed on the #2 Pic is that a permanent stain/discoloration from heat or oil that will wipe off?
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Old 06-23-2008, 05:58 PM
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Quote:
Originally Posted by SSedan64
V8hed on the #2 Pic is that a permanent stain/discoloration from heat or oil that will wipe off?
The brown marks are just oil. The lifter looks identical to that in pic #3.

Are my lifters really that bad? I really don't wanna have to change the cam if I don't absolutely have to.

Thanks,
Ian.
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Old 06-23-2008, 06:22 PM
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Like the ad on TV says, "You can pay me now or you can pay me later". It's probably gonna cost more later because the shrapnel will take out the bearings also.
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Old 06-23-2008, 06:33 PM
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Lifters

They are trashed, looks like improper break-in or possible light interference(spring retainer underside to top of valve guide or seal, maybe end of rocker slot to stud). Wouldn't go anywhere but the trash can if it were mine, cam is junk too. Time to completely disassemble and check the entire short block, the damage has been done. Everything is going to need a careful inspection and cleaning. Sorry it's not what you want to hear, but it was junk before you got it.
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Old 06-23-2008, 06:37 PM
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Quote:
Originally Posted by ericnova72
They are trashed, looks like improper break-in or possible light interference(spring retainer underside to top of valve guide or seal, maybe end of rocker slot to stud). Wouldn't go anywhere but the trash can if it were mine, cam is junk too. Time to completely disassemble and check the entire short block, the damage has been done. Everything is going to need a careful inspection and cleaning. Sorry it's not what you want to hear, but it was junk before you got it.
How can you tell? What is it about the lifters that tells you that?

This is very strange because the car was running great
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