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Old 04-23-2021, 02:46 PM   #1
Rob Doe
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Default Intake and Exhaust manifold nut torque

Well, I watched a You tube video that stated some guys tighten to 25 foot pounds while others go all the way to 60. I checked the torque on mine yesterday and found they were around 25. I upped them to 30. Looked in the Les Andrews book, but didn't find a recommendation.



In the back of the book, it has a torque chart that gives numbers for 7/16 bolts, grade 2, 5, and 8. It lists dry and lubed etc. But, it doesn't say anything about a stud.


What say y'all.
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Old 04-23-2021, 03:31 PM   #2
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Default Re: Intake and Exhaust manifold nut torque

Les Andrews book says 45 ft# but I think that is a bit high. I use between 35 and 40.
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Old 04-23-2021, 05:15 PM   #3
J Franklin
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Default Re: Intake and Exhaust manifold nut torque

I like 35 ft#
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Old 04-23-2021, 08:53 PM   #4
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Default Re: Intake and Exhaust manifold nut torque

"good and tight" is about right !! I suspect that about 99.9% of all Model A's lived their first 50 -60 years without ever encountering a torque wrench.

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Old 04-24-2021, 10:13 AM   #5
katy
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Default Re: Intake and Exhaust manifold nut torque

Wot's a torque wrench?
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Old 04-25-2021, 08:29 AM   #6
Bob Bidonde
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Default Re: Intake and Exhaust manifold nut torque

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The cup washers on the manifold studs are springs that accommodate thermal expansion. The washers should not be compressed by tightening the nuts. Just tighten the manifold nuts enough to stop any leakage with the engine running and hot. Periodically check for leaks and snug the nuts to stop any leaks found.
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Old 04-25-2021, 10:16 AM   #7
Rob Doe
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Default Re: Intake and Exhaust manifold nut torque

Thx all.
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