[Jack21]

Used the header bolts with lockwashers. Believe they were ARP. Small diameter (3/8") 12 point head. Easy to get to with a skinny 3/8" box. Used small amount of anti-sieze for steel into aluminum corrosion protection. Used solid copper gaskets, and ultra copper silicone sealant. Stays tight, and no leaks. The ones that get really hot are the collecter bolts. You must use stainless on these or they'll rust in a heartbeat.