[stormmaster]

Yes it is very common....no you do not have to replace the motor...however it is fairly expensive to have repaired. There are a lot of variables. When I had mine done I replaced the studs with ARP brand....they are pretty much bullet proof. The issue is with the materials the original studs were made of. The heat cycles over a period of time weaken the exhaust studs causing them to break. Most likely with only two broken studs no other damage was done. The nice thing is you were going to have to pull the pipston/cyl anyway to replace the rings...so basically if you can get the studs out while you are at it the only extra cost is the studs. You have several options as far as the quality and material and price of the studs are concerned. If you do a search for head studs you will see that you are far from being alone in this matter.