I ordered a set of ARP 12mm head studs, for my truck. They came in last week, and I just looked at the box and it reads 5.9L 12V diesel hsk part #247-4203. I looked at ARP's site and for a 24v it says 247-4202 is the part number for my truck. are the ones I got usable? Or should I call the place I ordered them from and try to exchange them?

 

the 12 valves have 2 different length head bolts. the 24v uses the same length bolts for all of them so you will have to return those and get a set for a 24v.

 

They said they'd return them, I thought that they looked strange being two different lengths. bad part is they said they were out of stock of the 24v studs and they are on back order. Only ones they had were the 625's but of course those are about twice the price, Time to shop around.