i have put together a 383 with a .480/.480 lift cam and 1.6 rockers. now i think my heads are set up fo about .500 max lift is this a problem? i dont quite remember if they are set up for more or not i bought them off ebay and forgot the lift specs but if it is .500 max then will cause what i am about to describe? i ask this becasue i keep finding out that after a little while i have valve taps and have to adjust them. this is the second time in about a thousand miles. i am also finding small amounts of metal shavings. i originally had a gear drive then went to a timing chain so im not sure if the metal is form that or am i destroying my cam with the 1.6 rockers. will going down to 1.5's help with this? this is the first engine i put together so im kinda new to all of this. any help is appreciated thanx vinnie