L78 failed Rocker Stud after 50 years!!!

[Joe L.]

Re: L78 failed Rocker Stud after 50 years!!!

Joe

If there is oil residue build up on the stud removing the lock nut could unscrew the stud rather than the locking nut. It doesn't seem to me to be much of a problem in our V8 applications, but a possibility none-the-less. Other applications could be more problematic.

Terry------


Yes, that could be the case. However, the exact same thing could also occur with stock GM rocker studs so I don't see why the ARP studs would be any different in this regard.

However, I did just get a response from ARP to my question and here it is:

Hi Joe,



Thanks for the inquiry. Most self locking nuts are a two crimp lock nut and that creates a greater interference with the root diameter of our studs and can lead to galling. Most OEM studs have a phosphate or cad plating which acts somewhat like a lubricant.



Best regards,

Zac Kimball



Technical Support

Automotive Racing Products, Inc.

800-826-3045

ARP-bolts.com

[Terry M.]

Re: L78 failed Rocker Stud after 50 years!!!

Thanks for pursuing this Joe.

[Richard M.]

Re: L78 failed Rocker Stud after 50 years!!!

Try Competition Products they are a good source

[Gary C.]

Re: L78 failed Rocker Stud after 50 years!!!

Thanks for your help, everyone.
I will go with the ARP studs.
Gary
Perth, Western Australia

[Gary C.]

Re: L78 failed Rocker Stud after 50 years!!!

135-7201.jpg

I don't have a thread gauge but it looks like the screw in diameter pitch is M10 as they are defiantly not 3/8 UNC see photo.

Looks like I need these one.

https://www.summitracing.com/parts/arp-135-7102