intake manifold torque?
#2652258
05/05/19 01:36 PM
05/05/19 01:36 PM
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Joined: Mar 2015
Posts: 23
SoCal
droptail
OP
member
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OP
member
Joined: Mar 2015
Posts: 23
SoCal
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my service manual says 40 lb-ft for the (8) large bolts - but says nothing about the (6) small plate bolts front & rear?
' '70 Cuda convt - 383 bored/ported, Hemi cam, Rhoads, rollers, Mellings, MSD, 750 DP, LT dual 3", lowered, snubber, police chuck, discs, springs, sway bars, Transgo, posi, shaker, aluminum 17" rallyes w/275-285/40 EXTREMECONTACT SPORT, leather...
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Re: intake manifold torque?
[Re: droptail]
#2652288
05/05/19 02:54 PM
05/05/19 02:54 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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"evenly snug" would likely suffice on that situation which is probably why no spec is given but a person could Google the torque spec (in lbs) for the grade/dia of those small bolts in question. Dont forget some sealer under the valley pan ends to keep the oil where it belongs.
live every 24 hour block of time like it's your last day on earth
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Re: intake manifold torque?
[Re: RapidRobert]
#2652295
05/05/19 03:17 PM
05/05/19 03:17 PM
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Joined: Jan 2003
Posts: 4,270
Morrow, OH
markz528
master
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master
Joined: Jan 2003
Posts: 4,270
Morrow, OH
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I would not do 40 on an aluminum intake. Cast iron ok, but not aluminum. I believe I torque my aluminum manifolds with a good washer to 35 ft lbs. That should be adequate for a grade 5 bolt.
67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......
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Re: intake manifold torque?
[Re: droptail]
#2652383
05/05/19 08:17 PM
05/05/19 08:17 PM
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Joined: Aug 2003
Posts: 43,124
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,124
Bend,OR USA
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All the factory service manuals I've used say 35 Ft..Lbs. on the 3/8 intake bolts, not 40 Ft Lbs.  The 1/4 inch end bolts need to be tight, not twisted off  As said some of the after market intake manifold specs. sheets call from 25 to 30 Ft. Lbs.  I do retorque the intake bolts several times after driving it enough until the bolts take a final set and stop moving 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: intake manifold torque?
[Re: Cab_Burge]
#2652523
05/06/19 10:31 AM
05/06/19 10:31 AM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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For torque specs when not in the FSM. Though the FSM used to have something similar in in. Do not change the spec just because it's clamping an aluminum manifold.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: intake manifold torque?
[Re: Supercuda]
#2655707
05/15/19 02:06 PM
05/15/19 02:06 PM
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Joined: Mar 2015
Posts: 23
SoCal
droptail
OP
member
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OP
member
Joined: Mar 2015
Posts: 23
SoCal
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' '70 Cuda convt - 383 bored/ported, Hemi cam, Rhoads, rollers, Mellings, MSD, 750 DP, LT dual 3", lowered, snubber, police chuck, discs, springs, sway bars, Transgo, posi, shaker, aluminum 17" rallyes w/275-285/40 EXTREMECONTACT SPORT, leather...
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