If you just have a couple, you could pin them. I have done that in the past when I was poor.
If it was mine I would take the heads off and have them machined for screw in studs.

To do it right you need to pull the heads. I don't know how old the engine is or if the heads were also new. If there is a warranty I would contact them and let them know of your problem that should not happen with only 15 hours on the engine. If you have no warranty I would install screw in studs.

I would also have the machine shop check all the studs if you choose not to install the screw in studs. You only want to do this once.

Rob

Formula,
Pioneer makes a repair rocker stud that is threaded on the bottom. It is not a performance type with a hex on it, just a straight stud with 7/16" coarse threads on the bottom. The existing rocker stud hole is the perfect size for the 7/16" tap. All you have to do is tap the hole (s) and install the repair stud. I think the part number is RM348, but if you call me on Tuesday, I will give you the number for sure. Real easy fix without pulling the heads.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
301-843-5700

My father just did this to a friends 350 engine. 3 had pulled loose, so they used a type of puller to extract the rest of of the studs, and tapped all of them in an afternoon. Only had to remove the valve covers.

Darrell.

that would be great....will my rockers work? and yea let me know where I can get them and what it will take!!

You could thread the stud and tap the hole and just wait till the next one comes loose.

Formula,
Your machine shop should be able to get them for you if they dont already have them in stock. I am almost certain that the Pioneer part number is RM348. I have them at the shop if you want to call me on Wednesday and I will gladly give you the number for sure. The most important thing is keeping the tap straight while starting it. Your rockers will work fine. Dont screw the new stud in too tight as it can split the stud boss if you aren't careful.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
301-843-5700

It is quite possible the heads were baked and blasted to get them clean. It is very common to have stud issue after that. I have not been in the business for several years, but we used ti use .003-.005 oversize studs and loctite to repair them in the past, but is sounds like like the pioneer screw in repair studs would work just as well if not better. Just be sure you are not experiencing coil bind, or retainer guide boss interference that is causing the studs to pull out.

thanks for all your help guys...I am going to call the machine shop today. I have one question though.

How do I install these new studs by pioneer? There is no nut to tighten? Should I install the rocker arm nut and use that to tighten?

I would use the 2 nut method (don't like the sound of that) tightning them together, and then torquing them to the proper specs. Don't forget the red locktite.



Darrell.