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Topic: 350 Turbo Hydromatic pan bolt torque specs

in Forum: C3 Driveline Components


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350 Turbo Hydromatic pan bolt torque specs (1/6)
 1/8/23 2:36pm
Kenny78Gold Member
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Toms River, NJ - USA

Vette(s):
1978 Silver Anniversary Coupe Lt. Biege w/ Dark Brown Int. Happily owned since 1981.


Joined: 7/28/2004
Posts: 115

Hi all,

 Anyone know the proper torque specs? Shop manual from Chevrolet says 130 in lbs.  

Other publications say :

7-9 ft lbs

10 1/2 - 13 ft lbs

84 -90 in lbs

Does anyone know ? 

Thanks

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Re: 350 Turbo Hydromatic pan bolt torque specs (2/6)
 1/8/23 6:23pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

I don't KNOW, but think it would depend on the type of gasket used. Neoprene -v- rubber -v- cork. Are you assembling it dry or wet?  Have to be careful of squish factor! 



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Re: 350 Turbo Hydromatic pan bolt torque specs (3/6)
 1/9/23 1:44pm
Kenny78Gold Member
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Toms River, NJ - USA

Vette(s):
1978 Silver Anniversary Coupe Lt. Biege w/ Dark Brown Int. Happily owned since 1981.


Joined: 7/28/2004
Posts: 115

Using cork gasket. Installing it dry. What do you suggest? Thanks

Re: 350 Turbo Hydromatic pan bolt torque specs (4/6)
 1/9/23 2:04pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 2382

Suggestion only. Follow GM criteria.



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Re: 350 Turbo Hydromatic pan bolt torque specs (5/6)
 1/9/23 4:23pm
F4GaryGold Member
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Grapevine, TX - USA

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1972 LT-1 convertible with factory air.


Joined: 8/26/2006
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My 72 GM Service manual says 130 inch lbs.  Not sure if that helps.



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Re: 350 Turbo Hydromatic pan bolt torque specs (6/6)
 1/9/23 4:34pm
Kenny78Gold Member
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Toms River, NJ - USA

Vette(s):
1978 Silver Anniversary Coupe Lt. Biege w/ Dark Brown Int. Happily owned since 1981.


Joined: 7/28/2004
Posts: 115

Thanks guys.

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