Allow me to add my two cents worth.
First let me say that I did not read all the entries on this thread. I'm just too lazy!!
So this may have already been well covered.
I would submit that the problem is the
oil you used during break in. It did not contain the needed quantities of
Zinc Diakyl Dithiophosphate. There is alot of mis-information regarding oils out there that are said to contain the needed levels of this compound.
Diesel oils that are sold over the counter DO NOT. This includes the Delos and the Rotellas. Some of the fleet available Delos and Rotellas do but it is only available in 55 gallon drums to trucking companies.
What needs to be used is what they are now calling the "Off Road Only" oils. This from Joe Gibbs racing, Valvoline, Brad Penn, Castrol and others. Some of these companies sell a break in
oil as well.
I use an additive that is a bottle of the
Zinc Diakyl Dithiophosphate from Krban Perfomance called ZDDPLUS. You can use it with ANY
oil. I have not had a camshaft failure since using this product. Here is the phone # 215-766-1611 X2.
I use two bottles during break in a one with every oil change.
There is also a
synthetic oil I use that has the correct levels of these items in it. That oil is sold by Synergy Oil company. Yes it's expensive. But cheap compared to re-doing your engine. Their phone # is 800-456-7665. They only produce oils with the needed levels in them. I like the 3W-30 sythetic.
One other point. An engines need for
Zinc Diakyl Dithiophosphate is not just for break in. This type of oil needs to be ran ALL THE TIME. It benefits ring sealing, rocker arm fulcrums, valve tip to rocker arm, pushrod contact points, oil pump life and so on.
Hope this helps.
Concobra