Unstoppable Coolant Leak

pishta said

12ft/lbs? I been doing AL intakes wrong forever @ 35 ft.lbs. But I never had one leak either.....interesting. Weiand states 25 ft/lbs and also calls out .050-.060 soft composition gaskets for aluminum intakes. I dont think I ever loosened something and had it stop leaking...'cept maybe a Holley 1920 bowl....

Click to expand...

In the service manual for 5.9 Magnum it calls for the final torque to be 12ft/lbs. I have a new 408 and when I installed the new Hughes intake I torque them to 12ft/lbs. It did fine for a while but then I started hearing a whistle noise. The intake was leaking on number 6 cylinder intake runner where it meets the head. I talked to a engine builder and he told me to torque the intake bolts to 35ft/lbs. I was hesitate at first but did it anyway. The leak was gone and have put 2700 miles on it with no more issues. So you really can't go by the service manual...LOL