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Old 10-07-2010, 11:46 AM   #1
kbuhagiar
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Location: South San Francisco CA
Default Torque spec for non-factory screw-in rocker studs

Hello Folks,

My SBC heads have replacement screw-in rocker arm studs, the shoulderless kind (not OEM).

What would be the torque spec for these studs?

I need to re-torque and re-seal all of them, and I also need a recommendation for a threadlocker. I was thinking of Loctite 242; any other ideas?

Thanks in advance.
__________________
Cheers!

Ken - South San Francisco, CA
1965 Coupe 327/350 purchased 1979 sold 1980
1963 Convertible 327/300 purchased 1983 sold 2010
1947 Plymouth Special Deluxe/Corvette TPI power
1964 Mercury Comet Caliente

Last edited by kbuhagiar; 10-07-2010 at 05:55 PM.
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Old 10-07-2010, 04:46 PM   #2
JohnZ
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The link doesn't work, but the cylinder head end of those studs should be 7/16" threads; 50-60 ft-lbs. should be about right.
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Old 10-07-2010, 08:29 PM   #3
GUSTO14
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Be very careful when torquing "shoulder-less" studs...
Click the image to open in full size.

Notice the raised ridge at the top of the threads (head side). If you torque them a bit too much this ridge acts as a wedge and it can very easily split the boss. Many heads back in the day had their boss' cracked because of these studs. Folks liked them because you don't have to machine the boss to install them, just tap the boss. But in my opinion it isn't worth the small savings to risk ruining a head.

If you are real lucky when one does crack, you may be able to machine the boss' and then use these studs...
Click the image to open in full size.

If you're not lucky, and many were not, well, you can always buy another head...

Good luck... GUSTO

Last edited by GUSTO14; 10-07-2010 at 08:32 PM.
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Old 10-07-2010, 08:42 PM   #4
jim lockwood
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I've broken shouldered rocker studs that didn't have an adequate radius at the shoulder. I'd be mighty wary of using shoulder-less studs (and how would you torque them, anyway?)

If you want to run screw-in studs, have the heads properly machined and get good stuff.... ARP studs. I've never broken one of these.

Jim
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Old 10-07-2010, 10:42 PM   #5
kbuhagiar
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Quote:
Originally Posted by GUSTO14 View Post
Be very careful when torquing "shoulder-less" studs...
Click the image to open in full size.

Notice the raised ridge at the top of the threads (head side). If you torque them a bit too much this ridge acts as a wedge and it can very easily split the boss. Many heads back in the day had their boss' cracked because of these studs. Folks liked them because you don't have to machine the boss to install them, just tap the boss. But in my opinion it isn't worth the small savings to risk ruining a head.

If you are real lucky when one does crack, you may be able to machine the boss' and then use these studs...
Click the image to open in full size.

If you're not lucky, and many were not, well, you can always buy another head...

Good luck... GUSTO
Quote:
Originally Posted by jim lockwood View Post
I've broken shouldered rocker studs that didn't have an adequate radius at the shoulder. I'd be mighty wary of using shoulder-less studs (and how would you torque them, anyway?)

If you want to run screw-in studs, have the heads properly machined and get good stuff.... ARP studs. I've never broken one of these.

Jim
I appreciate the cautionary tales.

I don't necessarily want to run screw-in studs, I'm merely playing the hand that was dealt to me. The car came this way.
I just want to get the valve train squared away and get 'er back on the road without having to pull the top end,
as I currently cannot devote sufficient time or resources to pull the heads.

Thanks again for the input.
__________________
Cheers!

Ken - South San Francisco, CA
1965 Coupe 327/350 purchased 1979 sold 1980
1963 Convertible 327/300 purchased 1983 sold 2010
1947 Plymouth Special Deluxe/Corvette TPI power
1964 Mercury Comet Caliente
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Old 10-07-2010, 10:42 PM
 
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