Power enterprises cambelt can be reused no problem, I've had mine on and off a good few times. athena gasket in theory can be wiped clean with brake cleaner and reused but tbh i never would as athena gaskets have a sealing layer between some of the mls and it gives a nice tight seal. you would of already compressed this so the second sealing maynot be as good. and arp is luck of the draw. they say you can reuse them up to 3 times but they always recomend new. i snapped one in half reusing it and ended up buying a new set. the broken peice came out easy too so wasnt like it was a dirty thread. it just shit itself on the final sequence. tbh it did look like a defective bolt from the break but just a heads up. my athena and arp where 1000 miles old when i had to replace both due to fitting a portpolished head. some times dude its best to just bite the bullet for peice of mind. they are expensive yes. but you choose to use expensive parts and tbh id always replace where posable. reuse just means redo a few weeks down the line. just my honest opinion bud.