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  1. #1

    Default Marine power 5.7 vortec intake manifold torque spec confusion

    I have a marine power 5.7 vortec carbuerated bought in 2013. I have a vaccum leak. I checked the torque on the intake manifold bolts and there at 12 ft lbs. Most online info I have found say 11 ft lbs is correct. However, the marine power guy says it should be 35 ft lbs. He had to go ask someone so I'm not sure he's right. I have also seen that in their repair manual for older 5.7s and also in a manual for 5.7s that say 35 ft lbs pre gen+ whatever that means. I'm concerned that I'm going to damage my engine if 35 ft lbs is incorrect.

    Anyone come across this issue or can anyone verify that 35 ft lbs is correct?

  2. #2

    Default Re: Marine power 5.7 vortec intake manifold torque spec confusion

    [QUOTE=Billnet;567798]I have a marine power 5.7 vortec carbuerated bought in 2013. I have a vaccum leak. I checked the torque on the intake manifold bolts and there at 12 ft lbs. Most online info I have found say 11 ft lbs is correct. However, the marine power guy says it should be 35 ft lbs. He had to go ask someone so I'm not sure he's right. I have also seen that in their repair manual for older 5.7s and also in a manual for 5.7s that say 35 ft lbs pre gen+ whatever that means. I'm concerned that I'm going to damage my engine if 35 ft lbs is incorrect.

    Seems to be that the Difference is 35 ft lbs for pre gen+ Engines. Can anyone tell me how to tell if i have a gen+ engine?

  3. #3
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,218

    Default Re: Marine power 5.7 vortec intake manifold torque spec confusion

    Ayuh,.... The Gen.+ has only 8 bolts in the intake, early manifolds use 12 bolts,....

    35 ft.lbs. for the older manifolds, 15 ft.lbs. for the Gen.+,...
    Any Grease is Better,... Than No grease at All....

  4. #4
    Join Date
    Dec 2015
    Location
    maplevalley WA
    Posts
    3,541

    Default Re: Marine power 5.7 vortec intake manifold torque spec confusion

    I would think it has alot to do with bolt size and the amount of gasket surface. Anything less than 20 ft lbs you will be alot more accurate converting to inch lbs and use the proper torque pattern. I would get a new gasket and put a light bead of permatex #2 in the valleys between the heads and block and slowly pull it down in at least three steps the more the merrier.
    It takes a nickle to go first class!
    If it aint broke dont fix it!!

  5. #5

    Default Re: Marine power 5.7 vortec intake manifold torque spec confusion

    Quote Originally Posted by kimcrwbr1 View Post
    I would think it has alot to do with bolt size and the amount of gasket surface. Anything less than 20 ft lbs you will be alot more accurate converting to inch lbs and use the proper torque pattern. I would get a new gasket and put a light bead of permatex #2 in the valleys between the heads and block and slowly pull it down in at least three steps the more the merrier.
    Thanks for your help. I followed the torque spec for the GEN+ and followed your advice. No leaks.

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