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Discussion Starter · #1 ·
Anyone tapped and installed them with good luck? Or is it worth having a machine shop install them?

I was adjusting my valves when a few of the press in studs came loose. I didn't think pounding them back in would be a good choice, so it might be a good time for the screw in type.

Any thoughts?
 

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in order to install screw in studs, you should have the bosses removed. i tried to do what you asked and i ended up with studs at different angles and one stud breaking on the freeway.
it would be good money spent to have a machine shop do the work.
 

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If your going to run guideplates as well I think you have to have the stud bosses milled the thickness of the plates.If you've got the close tolerance pushrod holes and aren't running guideplates you might be able to do it yourself.It sounds like you've got some work done to your heads though so personally I wouldn't risk it.I don't think it costs much to have it done
 

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Discussion Starter · #4 ·
They are 289 heads with the "guide" pushrod holes. Do they still need to be milled for ARP stud bolts?
 

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Most of your camshaft manufacturers make a tool that cuts the boss down, drills the stud hole & locates off of the press in stud hole. Mines an Isky. I've done it several times, the last pait on a drill press & a home made sine bar. I've never had a problem & I paid $35 for the tool.

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You still need to mill the bosses down because the stud will stick up too high and the rocker will bottom out on the stud. I have down several set of 289's and 351 with guides plates mill .3 off on 289 with broached push rod hole mill .25 off. Once you pull the studs you you can aline off the hole to get it close to start with use the valve cover rail.
 

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Discussion Starter · #8 ·
Thanks guys. I think I'll just have them installed, I've gone through enough with these heads to risk screwing them up more.
 
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