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Another ARP torque question
#749067
07/15/10 07:56 PM
07/15/10 07:56 PM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Well I bought , and recieved my ARP rocker studs, and they dont come with any specs. 3/8 studs, 3" long, and fine thread nuts. I was going to run them to 30ft lbs with arp lube. Also the brodix heads oil through the same rocker pedistal hole, the bolts I got from B1DARTSPORT are machined in the shank for oil flow to the rocker shafts. I was curious if I could index the stud, and just flatten the side of the stud that shrouds the oil hole, or If I accually have to neck the stud down all the way around the stud. Any ideas? Also there is SOOO much room that it really looks like I dont even have to machine the bolt, but the origional bolts are machined, so Im gonna do the same.
Kasey
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Re: Another ARP torque question
[Re: Moparnut426]
#749071
07/15/10 09:27 PM
07/15/10 09:27 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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3/8 grade 8 fasteners need a hair more than 30 ft/lbs IMO. I would torque them to 38-40 ft/lbs. A lbs or two either way should hurt it. But to work properly they need the pre load and stretch some.. That fastener should be very similar to a rod bolt. Both are 3/8 and fine thread also, not that makes a huge diff. 
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Another ARP torque question
[Re: Bob_Coomer]
#749072
07/15/10 09:33 PM
07/15/10 09:33 PM
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Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
dusturbd340W5
master
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master
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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do you have a picture and part number for these studs
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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Re: Another ARP torque question
[Re: Bob_Coomer]
#749073
07/15/10 09:39 PM
07/15/10 09:39 PM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Quote:
3/8 grade 8 fasteners need a hair more than 30 ft/lbs IMO.
I would torque them to 38-40 ft/lbs. A lbs or two either way should hurt it. But to work properly they need the pre load and stretch some..
That fastener should be very similar to a rod bolt. Both are 3/8 and fine thread also, not that makes a huge diff.
These are going through aluminum hold downs, and a harland sharp rocker shaft. I dont want to crush or distort anything, and cause an out of round surface for the rockers.
Kasey
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Re: Another ARP torque question
[Re: Moparnut426]
#749074
07/15/10 09:40 PM
07/15/10 09:40 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
That is what I was accually going to do. But I thought they were like that for a reason, so I just figured Id coppy.
Do you guys think the 30 ft lbs is good??
Oh and Randy, my header tube is in rout, and I plan on dropping the new bullit inn this next week. SUPER excited!!
Im sure Im gonna have to jet up, but I dont know how much.
Kasey
I torque 3 things on a engine, mains, rods and the heads
the rest gets the normal twist of the wrist to what
size bolt it is.... look up a torque chart for assorted
size bolts... take a couple pieces of material
and get use to different torques using a ratchet
then check them with a torque wrench... you will
be surprised at what you can pull... on the rocker
shaft hold downs I would give them 35
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Re: Another ARP torque question
[Re: MR_P_BODY]
#749075
07/15/10 09:49 PM
07/15/10 09:49 PM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Quote:
Quote:
That is what I was accually going to do. But I thought they were like that for a reason, so I just figured Id coppy.
Do you guys think the 30 ft lbs is good??
Oh and Randy, my header tube is in rout, and I plan on dropping the new bullit inn this next week. SUPER excited!!
Im sure Im gonna have to jet up, but I dont know how much.
Kasey
I torque 3 things on a engine, mains, rods and the heads
the rest gets the normal twist of the wrist to what
size bolt it is.... look up a torque chart for assorted
size bolts... take a couple pieces of material
and get use to different torques using a ratchet
then check them with a torque wrench... you will
be surprised at what you can pull... on the rocker
shaft hold downs I would give them 35
I hear ya Mr P, But I have a Huge investment here that I cant duplicat easily. Ive been working on the side, and saving for 5+ years to get this far. I do the same thing on regular vehicles, and dont torque unless its a high stress area. I think 35 is a good number also.
Kasey
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Re: Another ARP torque question
[Re: mac56]
#749083
07/16/10 08:13 AM
07/16/10 08:13 AM
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Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Quote:
I hear ya Mr P, But I have a Huge investment here that I cant duplicat easily. Ive been working on the side, and saving for 5+ years to get this far. I do the same thing on regular vehicles, and dont torque unless its a high stress area. I think 35 is a good number also.
Kasey
I don't know if you posted it before but what is the new combo? By the way I got that stud set on the engine. You saved me some bucks. 
Mark
72 .030 360 block, Ki 4" crank, Childs track master rods, Diamond pistons, Brodix B1Ba heads, Solid Roller cam, Manton pushrods, Harland sharp rockers, Older eddy performer rpm intake. Its studded, and has a main girdle, Precision oil pump, and topped off with a Quick fuel carb thats a base 750, but I was told flows 850ish. Bought the carb 2nd hand, and it worked GREAT on the old 360.
Last edited by moparnut426; 07/16/10 08:14 AM.
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Re: Another ARP torque question
[Re: Moparnut426]
#749084
07/16/10 08:41 AM
07/16/10 08:41 AM
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Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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i'm not a huge fan of those aluminum hold downs. they make it easy to distort the shafts since they clamp only a small area of the shaft.
when using studs on rocker shafts i use blue loctite to secure the stud to the head and green wick-n-lock on the nut. do not overtighten. call Harland Sharp and ask them about it.
the paper work that comes with the rockers should have the recommended torque.
you don't want to torque those down the same as you would for the same fastener in a different application. i would suggest no more than 30 ft. lbs. with 30 wt. oil. it would take 40-45 to stretch the stud and that will distort even a heavy wall shaft like you have. that's the reason i use the loc-tite.
machine shop owner and engine builder
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Re: Another ARPA torque question
[Re: Moparnut426]
#749085
07/16/10 09:04 AM
07/16/10 09:04 AM
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Joined: Feb 2004
Posts: 1,093
Long Beach, CA
Mike Swann
super stock
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super stock
Joined: Feb 2004
Posts: 1,093
Long Beach, CA
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Quote:
Quote:
3/8 grade 8 fasteners need a hair more than 30 ft/lbs IMO.
I would torque them to 38-40 ft/lbs. A lbs or two either way should hurt it. But to work properly they need the Prue load and stretch some..
That fastener should be very similar to a rod bolt. Both are 3/8 and fine thread also, not that makes a huge diff. :two cents:
These are going through aluminum hold downs, and a Harland sharp rocker shaft. I don't want to crush or distort anything, and cause an out of round surface for the rockers.
Kasey
Finally, A mention of distorting or crushing the shaft.
For whats its worth, I have always ran 25 ft-lbs. on shaft studs. 8000 rpm. They lift a little bit, have even bent the shaft between the studs, but never killed a rocker bearing or come loose.
the Harland sharp rockers are particularly sensitive to distortion.
8.30's @3400 lbs
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