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 3Likes
10-31-2015, 11:30 PM
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CC Member
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Join Date: Apr 2012
Location: Bay Area (Peninsula),
CA
Cobra Make, Engine: ERA 427, 427/487 side-oiler
Posts: 1,248
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Not Ranked
Oil pan studs or bolts?
I remember Barry R. saying in a post that studs don't provide enough clamping force vs bolts and will loosen over time, but that doesn't make sense to me. I like the installation advantages studs provide. Also, once you retorque them a few times to account for gasket compression, you can put another nut on them to keep the first one from loosening. Thoughts?
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11-01-2015, 04:27 AM
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CC Member
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Join Date: May 2006
Location: Portland,
OR
Cobra Make, Engine: ERA FIA, 1964 289->Webers
Posts: 3,689
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Not Ranked
I don't have much experience in that area but, I used bolts because I had them at my disposal & had bought studs where I could afford it(thought it most important). I've had the pan off a couple times & studs would have mad things a little easier
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ERA FIA 2088
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11-01-2015, 04:44 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,593
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I have always used bolts though studs would make putting the pan back on after removing it a little easier.
Ron
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11-01-2015, 05:30 AM
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Senior Club Cobra Member
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Join Date: Jun 2004
Location: Huntington,
VT
Cobra Make, Engine: E-M 427 Top Oiler stroked to 482 by KC, Stage 2 heads, a Quikfuel and Voila, 640 hp
Posts: 502
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Not Ranked
I put studs in (they came with the Canton pan I bought) and the the nuts CONSTANTLY loosened up! When I stroked the motor, I replaced them with ARP bolts. No more problem.
Tim
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11-01-2015, 06:00 AM
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CC Member
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Join Date: Aug 2004
Location: Orange,
CT
Cobra Make, Engine: KMP 736 Street, Pond 482, FAST XFI EFI
Posts: 339
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Not Ranked
I used studs and 'The Right Stuff'. Once that sh** sets up, loose fasteners probably don't even matter.  |
11-01-2015, 08:43 AM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
I have pan studs on my 331 stroker. I installed them "quite snug" and then used the blue gasket, tightening the nuts appropriately. i haven't had any issues with loosening, and I like the ease of dropping and reinstalling the pan---should I need to.
Pan studs have worked fine for me.
DD
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Dangerous Doug
"You're kidding, right?"
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11-01-2015, 09:45 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 18,997
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Not Ranked
Bolts are old school. I use.....
Studs add torque increase, easy installation and I heard better hold.
That's why they use in carbs, no?
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11-01-2015, 10:06 AM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
I've had both studs and bolts with oil pans on ally CSX FE blocks and my experience says Barry is correct. I never tried to figure out why but his conclusion makes sense to me.
Studs are easier, though. 
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rodneym
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11-01-2015, 11:29 AM
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CC Member
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Join Date: Feb 2003
Location: Jonesboro GA,
Posts: 382
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Studs are without a doubt stronger than bolts (not that an oil pan needs it). Nuts backing off is another issue altogether. I like the studs. |
11-01-2015, 11:59 AM
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Senior CC Premier Member
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Join Date: Nov 2004
Location: SoCal,
CA
Cobra Make, Engine: CSX #4xxx with CSX 482; David Kee Toploader
Posts: 3,574
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Not Ranked
ARP bolts here with little issues.
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11-01-2015, 03:07 PM
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Senior Club Cobra Member
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Join Date: Jan 2005
Location: saratoga,
ca
Cobra Make, Engine: Kirkham #185, Shelby Alloy 482; sold
Posts: 1,190
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Not Ranked
I was able to replace the pan gasket in my Kirkham with the engine in the car because I had bolts. If I had studs, it would have been very difficult.
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Dave
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11-01-2015, 03:35 PM
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CC Member
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Join Date: Aug 2014
Location: Syracuse,
Ny
Cobra Make, Engine: Superformance #2660, FE-406
Posts: 372
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Not Ranked
Studs, right stuff on gaskets, of which I use 2, moderate tension, after a couple heat cycles, go back for 2-3 odd ones that need to be snugged. You're done.
Have had zero pan drips with this system, Canton pan with windage tray.
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11-01-2015, 04:24 PM
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CC Member
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Join Date: Aug 2014
Location: Syracuse,
Ny
Cobra Make, Engine: Superformance #2660, FE-406
Posts: 372
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Not Ranked
Studs, right stuff on gaskets, of which I use 2, moderate tension, after a couple heat cycles, go back for 2-3 odd ones that need to be snugged. You're done.
Have had zero pan drips with this system, Canton pan with windage tray.
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The older I get, the faster I was.
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11-01-2015, 04:31 PM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
Quote:
Originally Posted by 4pipes
I was able to replace the pan gasket in my Kirkham with the engine in the car because I had bolts. If I had studs, it would have been very difficult.
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Well, that's a HUGE plus for bolts.
BTW. what oil pan do you run?
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rodneym
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11-01-2015, 05:57 PM
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Senior Club Cobra Member
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Join Date: Jan 2005
Location: saratoga,
ca
Cobra Make, Engine: Kirkham #185, Shelby Alloy 482; sold
Posts: 1,190
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Not Ranked
Quote:
Originally Posted by rodneym
Well, that's a HUGE plus for bolts.
BTW. what oil pan do you run? |
Aviaid dry sump pan with external oil pump, courtesy of Pat Buckley (give credit where credit is due).
BTW, there is a step where you have to hit the starter to move the throws/counter weights out of the way. Made me nervous with no oil!
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Dave
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11-01-2015, 06:02 PM
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Senior Club Cobra Member
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Join Date: Jan 2005
Location: saratoga,
ca
Cobra Make, Engine: Kirkham #185, Shelby Alloy 482; sold
Posts: 1,190
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Not Ranked
Alright, I'm getting to old and have CRS disease. Just went out and looked.....I have friggin studs, NOT bolts! 
That's why I had to reposition the crank.
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Dave
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11-01-2015, 10:13 PM
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Junior Member
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Join Date: Dec 2000
Location: Corralitos,
CA
Cobra Make, Engine: 1980 Arntz 427W, Webers, TKO600, Jag IRS
Posts: 476
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Not Ranked
I put Arp stainless studs and nuts on 2 weeks ago. Have had the pan off 2 times already (don't ask why) and it is easier than using bolts. It will come off again this week and I don't mind at all. The 4 corners are 5/16 studs with 3/8 12pt nuts and the rest is 1/4 studs with 5/16 12pt nuts.
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Tom
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11-02-2015, 04:11 AM
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CC Member
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Join Date: Dec 2014
Cobra Make, Engine: Superformance, Survival Motorsports aluminum FE 482
Posts: 662
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Not Ranked
Quote:
Originally Posted by lippy
I remember Barry R. saying in a post that studs don't provide enough clamping force vs bolts and will loosen over time, but that doesn't make sense to me. I like the installation advantages studs provide. Also, once you retorque them a few times to account for gasket compression, you can put another nut on them to keep the first one from loosening. Thoughts?
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Lippy. Why are you asking. Going to
change your pan?
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Bill
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11-02-2015, 05:22 AM
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CC Member
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Join Date: Jun 2012
Location: Naracoorte,
SA
Cobra Make, Engine: CR Cobra 3169
Posts: 818
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Not Ranked
Putting studs into ali has the advantage of not wearing out or stripping the threads over time. And if you use nylock nuts then they shouldn't loosen of.
JD
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11-02-2015, 06:09 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
I will chime in.
I used ARP SS studs and SS locking nuts.
One huge reason for me was I could take that tangled mess that came in the gasket box and put hole-over-stud and then drop the pan on.
I used grease on one side of the gasket and in 15 years it has NEVER leaked.
Just my $.02 worth
Tru
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