well i was having vacuum problems and what the vacuum gauge was telling me was leading me to beleive the valve guides were worn. before i took the valves out i noticed that the intake valves on the number 1 and 4 cylinders were not closed all the way after taking the rocker arms off. checked out the pistons and sure enough my valves smacked the pistons. so i now have a reason to replace the valves and put in new valve springs, retainers and a new camshaft from crane cams. any pointers or things i might need to know before i start. of course double check the crankshaft and valve timing to prevent damage,again? primarily anything needing to be done to the pcm since there is a diiference in the camshafts?

 

the stock pcm will work fine with the new cams....but it would help you out more to get some adjustable cam gears....that way you can gt more gains from those cams