head studs
#11
03-07-2010 | 07:52 PM
Diesel Wrench
Joined: Mar 2010
Posts: 512
Likes: 22
I didn't put them in, the PO put them in, but I have the paperwork, so I will see if there is a P/N on them for ya!
#12
03-07-2010 | 08:12 PM
Diesel Enthusiast
Joined: Nov 2008
Posts: 438
Likes: 108
From: In an old bus, down
ARP studs require milling the rocker pedestals.
A1 studs don't. They do require removing a little of the webbing in the top of the valve covers.
The stud portion of the ARP kit includes studs for the rockers that are just a bit too short to ensure full engagement of the stud and nut threads when the studs are fully seated in the head. Thus, the pedestals need milling to give the room needed.
The A1s on the other hand, have rocker studs that are plenty long to have all the threads engage but then they're a bit too tall and can (not always) interfere with the valve cover's sitting square on the head and sealing proper. Using pliers to twist the offending webs out of the way fixes it.
I recommend getting the A1 stud kit from Haisley Machine (Vann) as they are the creator of the original "Stud Kit" for the Cummins 12v. Top shelf support.
A1 studs don't. They do require removing a little of the webbing in the top of the valve covers.
The stud portion of the ARP kit includes studs for the rockers that are just a bit too short to ensure full engagement of the stud and nut threads when the studs are fully seated in the head. Thus, the pedestals need milling to give the room needed.
The A1s on the other hand, have rocker studs that are plenty long to have all the threads engage but then they're a bit too tall and can (not always) interfere with the valve cover's sitting square on the head and sealing proper. Using pliers to twist the offending webs out of the way fixes it.
I recommend getting the A1 stud kit from Haisley Machine (Vann) as they are the creator of the original "Stud Kit" for the Cummins 12v. Top shelf support.
Last edited by BC847; 03-07-2010 at 08:18 PM.
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#15
03-07-2010 | 09:41 PM
Diesel Bomber
Joined: Jul 2009
Posts: 1,861
Likes: 86
From: Kingwood, WV
hey BC847 which stud kits require bottom tapping the block? or is that how you get the A1's to fit with out needing to remove the fins off of the valve covers? and which studs require machining of the head and block due to increased diameter? i've seen the different variations of the product just dont know all the details of the installation.
#16
03-07-2010 | 09:48 PM
BOMBARDIER
Joined: Mar 2007
Posts: 11,159
Likes: 918
From: Gloucester, VA
hey BC847 which stud kits require bottom tapping the block? or is that how you get the A1's to fit with out needing to remove the fins off of the valve covers? and which studs require machining of the head and block due to increased diameter? i've seen the different variations of the product just dont know all the details of the installation.
#19
03-07-2010 | 10:37 PM
Thread Starter
|
Diesel Bomber
Joined: Aug 2009
Posts: 2,124
Likes: 102
From: Lincoln, CA
i am pretty sure thay are the same. and yes you need to have them machined it was only 75 bucks at herboth machine shop in marysville, if you dont get a true flat surface on the rocker blocks you wont get a true reading when you torque them down because the nut on the stud will move on the uneven surface
