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I'm getting a oil leak at the rear of the lower intake on the rear valley rail on my 94 cobra. I used a thick bead of silicone front to back all the time but these last 2 times I'm getting a oil leak. What intake gaskets do you guy recommend and should I use the rubber ends that come in the gasket kit since my beads seem to not seal properly. For what it's worth I have a s-trim on this car that I just installed.
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No gaskets needed for the block ridge to seal up.
You need to get intake studs, or if you're cheap get a set of carb studs from the parts store and put one on corners, I prefer the 2nd to the outside edge bolt hole.
Put a thick bead all along the ridge, any where it's flat it needs silicone. Let the silicone form a "skin" takes about 10-15minutes. From there lower the intake on with the studs to keep it from shifting around.
Do your torque sequence properly. I do 7lbs, 13lbs and finish off with 18lbs on the last go around. And go back and redue them every 10-15minutes afterwards 3 to 4times, just a quick bump with the torque wrench or just to make for sure they're still snug with a ratchet. That insures the gasket and silicone are compressed and you'll have a good tight seal.
Since you are running boost, make for sure your crank case isn't pressurized. If it is, you'll need a vacuum pump or figure out why you have excess blow by.
320rwhp. 7.67 @ 90mph 1.7 60'
DD: 2004 GMC Sierra VHO 6.0 LQ9 324whp 350wtrq -
Best trick to get a lower intake perfectly aligned it steal some TB studs from a fox intake and srew them into the heads. They act as guides.
What sealant are you using and what cleaning products?Comment
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Carb studs work too! And those tb studs get all rusty ..Originally posted by Z06killinsbf View Post
320rwhp. 7.67 @ 90mph 1.7 60'
DD: 2004 GMC Sierra VHO 6.0 LQ9 324whp 350wtrqComment
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We'll I just got some carb studs. The sealant I was using is Ford 7.3 diesel grey silicone,and industrial brake clean to prep. 7.3 silicone is known to be very strong. I want to say I've always had a leak back there ever since I did a head swap in 2007. Changed to a ported lower gt40 intake in 2009. It leaks right in the back driver side corner were the intake, block and head all meet. Went boosted this past march.Comment
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All seems well on your part, I would be curious if the lower doesn't have a hairline crack in it.Comment
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