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Old 01-15-2014, 12:23 AM   #1
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Don't think you need a 3-bolt cam?

Don't think you need a 3-bolt cam? Think again...the following damage occurred at idle while the car was warming up. I will be honest and say that the lifters did grind the cam lobes hard due to improper oil...shouldn't have been running Mobil 1. I know that now.

Pictures are self-explanatory.






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Old 01-15-2014, 12:41 AM   #2
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Old 01-15-2014, 01:44 AM   #3
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What oil do most recommend? My turner replaced oil with Mobile 1 syn when cam install was done. They also run the same oil on 700+ hp builds. Hmmm ....?
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Old 01-15-2014, 04:34 AM   #4
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The mobile 1 is fine, but there may have been debris on the cam from install, or the cam core was not the 8620 hardened version. We use Mobil on a lot of our builds, but we prelube the cam with non synthetic for install.
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Old 01-15-2014, 09:08 AM   #5
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yeah...and let's say you did have a 3bolt...somthing caused the resistance that sheered the pin and bolt. That would have still been there and still damaged valve train and what not.
Sorry to hear about that man.
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Old 01-15-2014, 09:19 AM   #6
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Oh boy, that's heartbreaking. I just pulled the AMC 401 out of my buddy's CJ over the weekend. PO swapped in pistons that were too tall, and 5 of the 8 hit the head and were all cracked.

Never a good feeling to open a motor and see that.
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Old 01-15-2014, 09:23 AM   #7
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Quote:
Originally Posted by grocerygetter View Post
yeah...and let's say you did have a 3bolt...somthing caused the resistance that sheered the pin and bolt. That would have still been there and still damaged valve train and what not.
Sorry to hear about that man.
Not necessarily, pin may have sheared on its own accord possibly from racing it or cold temps, who knows. But I do understand what you're getting at with that statement and it's kinda like "what do you want to be the weakest link" it will always be something...just a matter of what it is I guess.
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Old 01-15-2014, 09:24 AM   #8
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Yep, the pin is only there for indexing purposes only. The big bolt and high torque value is what keeps the sprocket stationary. Early on some single bolts failed because the pin was too long and wasn't allowing the bolt a true torque.
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Old 01-15-2014, 09:29 AM   #9
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Subscribing because I want a cam in my future. Curious to find out what went wrong
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Old 01-15-2014, 09:31 AM   #10
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Quote:
Originally Posted by Bo White View Post
Yep, the pin is only there for indexing purposes only. The big bolt and high torque value is what keeps the sprocket stationary. Early on some single bolts failed because the pin was too long and wasn't allowing the bolt a true torque.
I heard that as well. But those were old cam cores and that was a while back in one bolt design. Also read about the non-hardened cams having isues with that and wear overall.
So that brings up a good question...what are we looking at? Which motor, which cam, mileage?
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Old 01-15-2014, 10:11 AM   #11
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Well, it's an LS3, cam was put in at 12,000 miles and car now has 20,000 miles. Cam is 6 months old. Comp Cam specs are 219/235 .607/.619 113LSA. Not sure what material it was made out of.

The guy tearing it apart also said there was some valve float. Apparently the Lunati springs didn't hold. Also had trunion upgrade installed at the time of cam install.
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Old 01-15-2014, 11:53 AM   #12
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Man that sucks! Those valves look like they're just swaying in the wind!
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Old 01-15-2014, 12:10 PM   #13
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ADM just did my build and my cam was trashed as well, you could see the wear on the lobes and that cam had about 4 thousand miles on it. I think the metal was soft, it was a comp cam. ADM told me to run Mobil 1 15w50 in mine, it has a lot of zinc in it.
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Old 01-15-2014, 12:22 PM   #14
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Motor oil would have nothing to do with this accident I used 10w30

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Old 01-15-2014, 12:28 PM   #15
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I've been reading every one of these cam failure threads and I am getting antzy. Some say the new oils without something in it, some have pointed at Comp Cam cores made during a certain period, the 3-bolt thing..........what ever the deal is, we are not seeing LS3 engines last with cams put in them. It seem to be a real crap shoot. I think PQ's went the longest but still barely 50K miles or there about. Most are done by 20K
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Old 01-15-2014, 12:30 PM   #16
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Something here is amiss. I suspect the cam gear pin sheared due to the valve-to-piston contact, and not the other way around. hard to say.

I'm not a believer it the, "blame Mobil 1" camp for cam failures. Far too many performance shops still use it with no problems. The failures are isolated; if it were the oil causing it, they would all fail.

Sorry OP, that's some nasty stuff to deal with, there. Best of luck to you.
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Old 01-15-2014, 01:00 PM   #17
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My new cam is a comp as well.
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