Heres the deal my friend recently put a 460 in his 79 F100 truck it has a comp cam in it with comp lifters, and valve springs and Harland Sharp Rockers... It was a fresh motor so when he started it he ran it at 2000-3000 rpm for 20 minutes to break it in right towards the end it developed a lifter tap... everyone thought it was cause the oil thinned out a lil bit and the lifter bled out... but then he started it yesterday and it had the same tap and some of the rockers became loose he tried to bleed the lifters up by driving ti but it still taps any ideas on why??? Are his lifters collapsed? he did everything by the book and he cant seem to figure it out.... also their was some metal falkes in the oil pan after the break in is this normal for a fresh motor?