Well thanks for all your great advise.I can see i must give this some serious thought.By the way i got a quote of 600.00 to rebuild both heads plus roughly 125.00 for gaskets total about 725.00. Quote to do complete job 2,500.00 a savings of 1,775.00. If i get into trouble or screw up the timming some how it could cost me much more.I will inform you soon thanks again ,[food for thought]