[madmaxx]

The weakest link in any engine is the valve train. As we get more radical cams to squeze the last horsepower we have to go with higher spring pressures which in turn stress the pushrods, lifters and even the camshaft and turn the engine at higher rpm's. A stock 302 mustang has about 225 open and 100lbs on the seat. That is a far cry from the 400lb plus open pressures, probably higher with some solid lifters. Stock mustangs a go in excess of 150K miles. No replacement for displacement, if you want more HP get more cubic inches.

As someone used to say if you cant go fast with 100hp you cant go fast with 500hp.

As far as manufactures READ YOUR WARRANTY and note the limitations of liability, if you retorque bolts you may very well VOID the warranty. They are very explicit as to what you can do. In fact a smart person would read the warranty BEFORE they purhased the product.

This engine is out of warranty, bitter pill to swallow with less than 3K? miles but it appears the manufacturer fulfilled their obligation. Next time rack up 20K miles on the engine prior to it going out of warranty if it is going to have issues it will show up by then. If not you got a good 20K miles out of the engine.