Quote:
Originally Posted by Moto-Mojo
So, for us stock cars, is the consensus that this was brought on more by an aftermarket cam, etc? Or are we all just driving "ticking" time bombs?
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Internet forums tend to bring out the worst of a platform and put it in the spotlight. You read enough threads and you'll end up believing that every 5th gen is going to eat a set of lifters, snap it's axles, and have hot cranking issues. In reality, the majority DON'T have these problems, but some inevitably will.
To your specific question I think the answer is that an aftermarket, high lift camshaft is more likely to fail a lifter. You have more lift, more aggressive lobes, more spring pressure, and usually more aggressive driving manners to go along with a modded car. So, it would make sense that you'll see more failures in those cases.
The offset to this problem should be higher quality parts. The lifter is already an overworked and underpaid piece in the LS when it's stock, going back with a stock lifter on a more aggressive cam and valve spring is going to produce a predictable result of early failure. A cam package needs to be well thought out and appropriated for it's intended us case, and most places will just sell you on price and then you can pay it again down the road. It's frustrating to see.