I have a set of arp 425 head studs with one torque looking to trade towards 625s. Will add cash. Studs looked and felt good on removal and were in the truck for about a year.
Went from a 66 single to compounds and dual pumps. Popped headgasket and engine builder suggest stepping up the studs. I think they torque almost 20lbs more.
Not sure if you'll have any luck on someone who already has 625's that would want to trade down but you never know! Might have better luck just selling the 425's outright then finding some 625's
