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[Z06] what causes wiped cam lobes?

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Old 08-15-2014, 12:46 PM
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spy2520
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Default what causes wiped cam lobes?
Does this happen on stock and modified engines?
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Old 08-15-2014, 01:03 PM
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Yes it happens on both.

Bad cam core, incorrect cam installation, bad lifters, incorrect oil weight, oil break down, excessive spring pressure, incorrect valve train setup.
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Old 08-15-2014, 01:17 PM
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Add: incorrect break-in procedure.
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Old 08-15-2014, 02:53 PM
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Mine doesn't look good. Haven't pulled the valve covers so I dunno what If anything has been done to the heads.

The lobes don't look scored or chewed up but they are definitely worn down where the lifter wheel rides.
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Old 08-15-2014, 03:18 PM
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GM has a continuing problem with "soft" cams
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Old 08-15-2014, 04:21 PM
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That sucks
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Old 08-15-2014, 04:51 PM
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Originally Posted by spy2520
Does this happen on stock and modified engines?
My stock cam had scuffed/scored lobes and most of the lifters looked the same.
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Old 08-15-2014, 04:55 PM
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So am i looking at cam and lifters (if the top end is stock)? I think i already have a cam that would work.
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Old 08-15-2014, 05:53 PM
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Originally Posted by spy2520
Mine doesn't look good. Haven't pulled the valve covers so I dunno what If anything has been done to the heads.

The lobes don't look scored or chewed up but they are definitely worn down where the lifter wheel rides.
What are looking at? How can you see the cam lobes if you haven't even pulled the valve covers?
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Old 08-15-2014, 06:09 PM
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What are looking at? How can you see the cam lobes if you haven't even pulled the valve covers?
Oil pan is off.
Last edited by spy2520; 08-15-2014 at 08:18 PM.
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Old 08-15-2014, 09:17 PM
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Jezzzuuss, you're ambitious! I take it you pulled the engine? Out the top or bottom?
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Old 08-15-2014, 11:20 PM
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Originally Posted by phipp85
My stock cam had scuffed/scored lobes and most of the lifters looked the same.
Mine too,they looked like they had 200,000 miles, not 5000...
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Old 08-16-2014, 06:28 AM
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Here are a couple pictures of my OEM cam's "soft lobes". The lifters looked good considering. I did replace all the lifters and rockers.





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Old 08-16-2014, 10:49 AM
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That is pretty much what mine looks like. I'll try to get a pic. And the motor is still in the car.
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Old 08-16-2014, 11:08 AM
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Originally Posted by spy2520
That is pretty much what mine looks like. I'll try to get a pic. And the motor is still in the car.
Now I'm really curious..... How about you provide some details instead of spoon feeding? Do you have a coil over set up, or did you pull the spring, or...??
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Old 08-16-2014, 11:35 AM
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Dropped subframe, pulled leaf spring. Takes surprisingly little effort. I have a 2 post lift at my house though.
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Old 08-16-2014, 12:15 PM
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Pulling intake manifold/valley plate also gives a good view of most of the cam and would be easier to check for most people.
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Old 08-16-2014, 01:00 PM
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Originally Posted by Unreal
Pulling intake manifold/valley plate also gives a good view of most of the cam and would be easier to check for most people.
I didn't drop the pan to look at the cam, i just happened to see it while the pan was dropped.
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Old 08-16-2014, 01:13 PM
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How do you support the engine when you drop the cradle?
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Old 08-16-2014, 01:20 PM
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Originally Posted by Michael_D
How do you support the engine when you drop the cradle?
I have a "strut tower" engine support but i didn't think it would work on the vette. I have extremely tall jack stands holding it up currently. I think they go from 5'-8' or so. Same idea as using jack stands on the ground i guess, but with the added luxury of being able to stand under the car.
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