My experience with them is positive. Good customer service. I have their aftermarket heads, not rebuilt. I'm now looking at a 98.8 rating on ebay, with over 12k transactions.

 

^ That may be the trick then, between positive and negative ratings, new or rebuilt...

Just sayin'...

 

Truck is back and runs nice, everything else got a clean slate. Mechanic did mention a heavier then normal sludge build up in engine again which is odd considering only 75k on truck with normal oil/filter changes of 10w30. I asked if he could recommend any sludge cleaners, etc and he said not really but more frequent oil changes.