So when I put in the "used" engine, the guy i bought it frim said it was perfect runner. well we got it put in and it has valve knock like you would not believe. I took it in to a speed/mach shop in town adn he said that i might be able to get 30k out of it with out issues (other than the loss of power and the god forsaken noise) well I took my head from the blown engine and droped it off at his shop to get inspected to see if it was ok. well he called me back and said i need 3 exhaust valve (it was cracked) but he said for 304.48 i could have new intake and exhast valves put in 3 angle, deck the head and port and polish. well disassembly was $32.50 cleaning and reassembly was $32.50 teh new valve was $7.50 and the hone on all the valve seats was $65.00. that is $140.50. for another $160.00 I get a brand new head that was magna fluxed (or what ever they do) for cracks, hot tanked and ready to go. The decission was not hard.so I should see the head by friday.