Intake question
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Joined: May 2010
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Intake question
Hi all,
Got a crate motor. (86 4.9) new intake, new exhaust etc..
Instructions on the motor said to use their 2 piece intake / exhaust gaskets. So I did. I have also heard other stories. Like to not use an exhaust gasket at all.
I just did what they said to do and I only torqued the bolts once.
I guess I was supposed to re-torque them after heatin em up. It leaks now.
Was that the big mistake or is that gasket stacking method they recommend wrong?
I found a good picture of the same gasket setup here:
81-86 Ford Truck 4.9L 6-300 Exhaust Manifold & Gasket | eBay
Got a crate motor. (86 4.9) new intake, new exhaust etc..
Instructions on the motor said to use their 2 piece intake / exhaust gaskets. So I did. I have also heard other stories. Like to not use an exhaust gasket at all.
I just did what they said to do and I only torqued the bolts once.
I guess I was supposed to re-torque them after heatin em up. It leaks now.
Was that the big mistake or is that gasket stacking method they recommend wrong?
I found a good picture of the same gasket setup here:
81-86 Ford Truck 4.9L 6-300 Exhaust Manifold & Gasket | eBay
Postmaster
Joined: Apr 2003
Posts: 2,703
Likes: 4
From: Harrisburg, NE
no sure about the carb'd engines, but for the 89 big six in my bronco when i bought the gasket set for it that gasket was one piece. however it has holes for the extra bolts in the efi manifolds. but I think that a one piece gasket would work better than juggling two.
you could try re-torquing them if the leak is minor, i don't agree much about not running the exhaust gasket since the intake and exhaust are bolted to each other, seems to be a good way to get both exhaust and vacuum leaks.
you could try re-torquing them if the leak is minor, i don't agree much about not running the exhaust gasket since the intake and exhaust are bolted to each other, seems to be a good way to get both exhaust and vacuum leaks.
Super Moderator
Joined: Apr 2004
Posts: 34,495
Likes: 2,810
The one piece exhaust manifolds on mid-'80s 300s all leak and work themselves loose. You can use EFI manifolds, a pair of 3-into-1s with a little fiddling, and be pretty much done with the exhaust manifold nonsense. If you think that might be for you, there are a couple of threads on here about that.
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