I'm not having much luck getting my ARP head studs to seal off coolant, so I'm thinking about downgrading to head bolts. ARP's Professional Series is supposed to be a step up from their standard head bolts, but I want to make sure they'll be durable enough. My motor is pushing over 400 hp to the wheels with a 300 hp shot of nitrous.

 

We're running ARP pro series head bolts on our Camaro, and I've never had a problem. It's running a dual staged NX 350 shot. It's never blown a head gasket, or had any problems. Hope this helps..