Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: dvw]
#1887959
08/09/15 12:10 PM
08/09/15 12:10 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Shaft broke because the stud broke. I'm not sure what grade a Dorman stud is but I don't use them for anything significant. You can buy individual studs directly from ARP. Tell them what size you want. My paired T&D's had 2 studs on each mounting bridge that I thought should be longer. Bought new ones from ARP, reasonable. Doug I agree the stud went first... not sure if it was loose or just weak
|
|
|
Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: lewtot184]
#1888020
08/09/15 01:45 PM
08/09/15 01:45 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
to my knowledge all those hardware/auto store studs are grade 5. 99% of the bolts in my car are grade 8 or above except for some sheet metal screws
|
|
|
Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: Chris'sBarracuda]
#1888021
08/09/15 01:46 PM
08/09/15 01:46 PM
|
Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
master
|
master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
|
[quote=Chris'sBarracuda] When I had my Stage 6's I had rocker issues until I added these and changed the studs to 7/16" Another stage 6... pulled the threads, bent broke the shaft. the heads weren't drilled deep enough for a longer bolt/ more thread engagement. Fixed it the same way as Chris.
"use it 'till it breaks, replace as needed"
|
|
|
Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: J_BODY]
#1888090
08/09/15 03:32 PM
08/09/15 03:32 PM
|
Joined: Feb 2005
Posts: 20,185 PA.
pittsburghracer
"Little"John
|
"Little"John
Joined: Feb 2005
Posts: 20,185
PA.
|
With race cars after they hit a certain point you can spend a lot of money hopefully once the first time or do it on the cheap MANY times. The choice is yours.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
|
|
|
Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: 451Mopar]
#1888592
08/10/15 04:28 AM
08/10/15 04:28 AM
|
Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
OP
master
|
OP
master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
|
When I ordered the studs from Summit, they did not have a 3" long ARP, and the Dorman studs I used are advertised as Grade 8? I even checked their catalog.
These were torqued to 35ft/lbs, do you think I need more pre-load? ARP shows 45 ft/lbs for 3/8", 180,000 psi bolts?
I did order some ARP studs to replace these.
The heads have already been modified with 3/4" long timesert thread inserts, after milling the stock shafts off and using the Max wedge type rocker stands/hold downs. I'm not sure how I could goto 7/16" with the reduced diameter T&D shafts and have the rockers oil through the rocker shaft?
How much would it cost to have ARP make some custom studs???
FWIW, I ordered these: ARP-AJ3000-5B Summit has the material listed wrong as 4037?
This is the description from ARP: Stud, 8740 Chromoly, Black Oxide, 3/8-16 in. Base Thread, 3/8-24 in. Top Thread, 3.0 in. Length, Each
These ARP individual studs are made from 8740 chromoly steel with 190,000 psi tensile strength. They are precision centerless-ground and thread-rolled to Mil-S-8879 specs and have a black oxide finish. A nut and washer are sold separately.
Last edited by 451Mopar; 08/10/15 04:50 AM.
|
|
|
Re: Broke the rocker stand stud and T&D rocker shaft.
[Re: 451Mopar]
#1889474
08/11/15 01:39 PM
08/11/15 01:39 PM
|
Joined: Jul 2013
Posts: 561 USA
B3RE
mopar
|
mopar
Joined: Jul 2013
Posts: 561
USA
|
Can you be certain valvetrain instability didn't break the stud and the shaft?
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
|
|
|
|
|