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10-17-2019, 06:19 PM
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#1 |
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Senior Member
 
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,554
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French locks for exhaust manifolds
Who uses french locks on their exhaust manifolds? Any opinions on them? Supposedly they allow the outer bolts to have less torque and the manifold will be less prone to cracking. Some discussion of them here:
https://www.camaros.net/forums/18-en...all-bolts.html |
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10-17-2019, 07:29 PM
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#2 |
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Account Suspended
 Join Date: Jul 2016
Location: Tacoma, WA
Posts: 6,873
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Re: French locks for exhaust manifolds
They are mandatory of you want the manifolds to be leak and trouble free. Dont use manifold gaskets with them either. Usually the manifold needs to be surfaced for a tight seal.
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10-17-2019, 09:27 PM
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#3 | |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: French locks for exhaust manifolds
Quote:
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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10-17-2019, 09:46 PM
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#4 |
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Senior Member
Join Date: May 2010
Location: Wisconsin & Arizona
Posts: 4,838
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Re: French locks for exhaust manifolds
I have them on my truck, primarily because they were original to the truck. However, they should eliminate the possibility of the bolts loosening.
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10-17-2019, 10:02 PM
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#5 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,789
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Re: French locks for exhaust manifolds
I use them but I never knew they were called French locks.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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10-17-2019, 10:08 PM
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#6 |
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Senior Member
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 528
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Re: French locks for exhaust manifolds
There were still on mine, had manifolds resurfaced and threw out the stupid gaskets. Reinstalled the French Locks after.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof |
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10-18-2019, 10:18 AM
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#7 |
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Registered User
Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: French locks for exhaust manifolds
Those are a good idea, most just rip em off when installing new gaskets or working on the exhaust.
I have gaskets on mine, no locks, no issues, Mileage and opinion will vary. Oh I go thru and tighten them about every 6 months, needed or not. |
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10-18-2019, 10:35 AM
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#8 |
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Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,554
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Re: French locks for exhaust manifolds
Do you torque the middle bolts to 30-35 ftlb and end-pairs to 15-20 ftlb, to reduce cracking of the exhaust manifold? That is supposedly what the french locks allow you to do.
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10-18-2019, 01:00 PM
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#9 | |
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Registered User
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,421
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Re: French locks for exhaust manifolds
Quote:
curious as to the torque numbers
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim |
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