Over 25k miles with no problems.

 

Spun my stock one on a 130k mile car

Was part of the reason for rebuilt.

 

On my Gen 1 357 in my 85 I installed three different cams(flat tappet) in one month because the first two went flat which = metal in the motor(Coil bind because of .015 too much lift for the springs). I installed all three cams myself and flushed the motor each time. I ran the everliving s**t out of that car every day and never had a single problem with it after that. The new owner tells me it still runs strong and he runs it harder than I ever did. Just be clean about it and take your time. There's nothing to worry about. I have ~18,000 HARD miles on my rebuilt(by me) LT-1 with mods in Sig. and all I've had to do is change the oil.

 

9 months and ~3300 miles later, spun bearing after bouncing off the rev limiter for the first time ever. 92k miles on engine before cam swap. No shortcuts, no cleanliness issues, no coolant in oil. Engine disassembly showed bearings were fairly worn. Oil pressure before rebuild was not going over 50 psi at any time and would go toward 10 psi on hot idle.

 

My motor had around 85k when I did the cam install. 10-15k miles on my cam install with MANY passes at the track and I beat on it a little everytime I take it out on the street. I do try to keep the RPMs below 6k though which probably helps. My oil pressure is 20 psi at idle and 40 psi at cruise so its right on par with what it should be.

 

i think it has more to do with the way you drive it after the cam install... reving the sh** out of it to 7000rpm tends to break things on stock motors jmho

 

Nah, man i beat on my car every time I drive it, thats what its for

 

Uh oh. The odds of a successful cam swap are going down hill. Now it's 43 to 6. 12% have spun bearings.

Dan

 

I've installed 3 cams in 3 different cars and havent had any problems with either car. *knocks on wood*

 

**** if I dare comment.

 

Installed the cam with 57k on motor, have put a little over 4k on it so far. I would consider most of those miles as hard driving/serious abuse. Lots of wot runs up to 62-6300rpm, about 20 1/4 mi passes dipping into the low 12's and no problems yet.

 

IMO I think all who spin a bearing after an install of any sort is only because the motor was tired to begin with, or whoever owned the vehicle before beat the **** out of it. I was lucky enough to be the second owner of mine of a guy who owned a car dealership and drove it like an old man, of course it had every option installed which I discreetly removed most of them....second of all its about cleanliness.. I lit my engine on fire and doused it with water so bad I had it circulating thru the oil for about 2 miles until I drained it and still had no problems...got 120,000 on the clock and warm idle PSI is a little under 20 and cold it's @45.

 

lol yea i beat the **** out of my car too, but im just saying the extra power and over revving that you have with a bigger cam dosnt help a tired old 130,000 mile motor

 

I've got 25k on mine since the cam install. No spun bearings yet.

 

Let me say this about that: I recommend that whenever anyone blows an engine that they "post" and give the details. For those of us who have lost an engine and paid through the nose to fix it, we understand how valuable every bit of information might be to those who have yet to experience the trauma.

I neglected to diligently pursue the possible cause of my engine's event (probably because it was the mechanic's fault and they provided no insight as to the possible cause.)

Performing an auto topsy is usually the last thing we think of when something catastropic happens to the motor. We usually just want to get the damn thing repaired ASAP--knowing too, that if it was worked on by someone else that it would mostly likely be a futile effort to get them to admit they screwed up. JMHO