I've got a blown headgasket and I've been searching around ht to find out what everyone else has been using for a headgasket. I'm pretty much set on using the cometic hp one. I like the .036" thickness. My question is which bore should I get. I've seen both 81mm and 81.5mm. 81mm is the stock size right? Anyone know where I can order this along with some ARP head studs online? Also, is a blockgaurd something I should think about too? I'm running nitrous.

 

Also, I'm looking to get my head port matched if that makes a difference.

 

ttt