Yeah, the bad part is the work was done over a year ago and I only had a one year warranty on the motor after the rebuild. The shop machined the block and replaced the waterpump, timing belt and tentioner, and the plenum was replaced, the crankshaft bearings and all associated parts were also done but no mention of the heads being done. I mean everything was replaced right down to the starter and the alternator was even rebuilt!! I think I might have the valves done next and hope that cures it!! Any more sugestions or ideas? It still has plenty of power and I haven't had any other problems beside a leaky oil cooler return line!! Any one thinking Valve guides?