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Old 02-20-2007, 09:19 PM   #1 (permalink)
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Rocker stud torque in an aluminum head

My ARP 7/16 rocker studs say to be torqued to 55 foot lbs. with arp lube... is this for iron or aluminum heads ? I am paranoid about the torque when it comes to aluminum heads-
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Old 02-20-2007, 09:53 PM   #2 (permalink)
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Rocker stud torque in an aluminum head

Same with me, I torqued my studs in my aluminum heads to 50ft-lbs. Spec was 60 but I don't know, 50 felt like it was enough. You definitely don't want to strip out those threads
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Old 02-20-2007, 11:22 PM   #3 (permalink)
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Rocker stud torque in an aluminum head

When i recieved my heads from CHI thats all i got... 2 heads in a box. No paper saying anything about threading or torque or "You are brilliant for choosing these heads"... you know, comfy stuff.
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Old 02-21-2007, 03:18 AM   #4 (permalink)
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Rocker stud torque in an aluminum head

Before you install the studs, be sure there is adequate counterbore in the heads to accept the ARP studs. Often, at least with ARP, the unthreaded portion of the stud is longer than necessary and can interfere with proper torque, even with guide plates. The stud will try to pull the threads out of the head when the unthreaded part of the stud gets torqued. Ask me how I know . . . . .

Not familiar with the CHI head and its counterbore, but worth checking out.

Also, if you do not put enough torque on the studs, whenever you adjust valves you will need to place a wrench on the stud nut to keep it from backing out. Again, ask me how I know . . . . .

I decided that the common .750" base thread length of the stud, minus the .110", and also minus the .040 or so counter bore leaves very few threads to screw into the raw aluminum head (one without heli coils.) My solution was to purchase the 1.6" base stud length big block chevy exhaust studs and cut them down for proper length. In my case, I gained an additional 3/8" more depth in the head. Oh, I still had to helicoil the 3 holes that I over torqued due to incorrect counterbore . . . .


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[ This Message was edited by: dennis111 on 2/21/07 6:55pm ]
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Old 02-21-2007, 04:00 AM   #5 (permalink)
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Rocker stud torque in an aluminum head

You're not gonna hurt aluminum heads torquing 7/16 studs at 60 pounds. But I am also paranoid when it comes to screwing things into aluminum also. My worst fear is putting in a spark plug and making a "new" thread.
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Old 02-21-2007, 07:10 AM   #6 (permalink)
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Rocker stud torque in an aluminum head

Glad my Edelbrock heads came with helicoils in the stud holes.

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[ This Message was edited by: bmcd66250 on 2/21/07 10:11pm ]
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Old 02-21-2007, 11:02 AM   #7 (permalink)
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Rocker stud torque in an aluminum head

Will do dennis, thanks.
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Old 02-21-2007, 03:26 PM   #8 (permalink)
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Rocker stud torque in an aluminum head

The instructions that came with my AFR 185 heads recommended torquing the rocker studs to 60 ft lbs.

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Old 02-22-2007, 06:04 AM   #9 (permalink)
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Rocker stud torque in an aluminum head

Below is a pic of various 7/16 ARP rockerstuds that I have used in aluminum heads:




The first is standard ARP with a 3/4" total reach into the head. The second is my modified BBC rocker stud with .500 removed from the bottom and and the top was cut down to the standard heigth. The packet shows the original length of the BBC rocker studs, ARP 235-7206. There are only 8 in a pack.

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[ This Message was edited by: dennis111 on 2/22/07 9:05pm ]
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