I have a full new set of ARP head studs,washers, and nuts for a 4G63 if anybody needs them. I ordered a set for the 420a and was sent the wrong ones. Now I can't get ahold of the guy to swap them out. So I had to get a different set from ARP. I paid $110 for them. I'll sell them for $80. Email me at no2avenger@yahoo.com