351M intake sealing tips/techniques
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351M intake sealing tips/techniques
Hey guys, I've been reading about a number of different ways to get the 351M intake to seal properly. I had a hell of a time getting it to seal last time I took it off, so I want to be better prepared with a good strategy this time. I'm not going to block off the exhaust crossover and I am going to use the turkey pan. Should I use the rubber gaskets included with the pan? What size beads to use in sealing the intake ports to the heads, and the front and rear seals to the block? Help me out with whatever you guys can.
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From: chicago burbs
"Should I use the rubber gaskets included with the pan?"
no, they are cat toys.
"What size beads to use in sealing the intake ports to the heads"
sillycone does not stand up to gasoline, it turns to jello. i usually use nothing but the paper gaskets on the heads in the port area. one time i used "Edelbrock Gask-a-cinch". there is a product called Hylomar that is supposed to be OK on intake ports but i've never used it.
"and the front and rear seals to the block?
first i smear a little on both the block and turkey pan to get a good "footprint". then i put a bead on top of all the smears. the beads need to be more than 1/2 the total so they meet and smoosh. let the beads start to set up a little before you start the circus act of fitting the pan into place, but not too long. when you get it on the locating dowels it'll be twisted out of shape a little. when you set the intake down on it, it'll flatten out.
the pan install is clumsy and awkward but just expect that and get through it. set the intake down and get the bolts into the holes and just barely start them threading so you can wiggle the intake around until they are all started, then sugg it all up and torque to spec.
no, they are cat toys.
"What size beads to use in sealing the intake ports to the heads"
sillycone does not stand up to gasoline, it turns to jello. i usually use nothing but the paper gaskets on the heads in the port area. one time i used "Edelbrock Gask-a-cinch". there is a product called Hylomar that is supposed to be OK on intake ports but i've never used it.
"and the front and rear seals to the block?
first i smear a little on both the block and turkey pan to get a good "footprint". then i put a bead on top of all the smears. the beads need to be more than 1/2 the total so they meet and smoosh. let the beads start to set up a little before you start the circus act of fitting the pan into place, but not too long. when you get it on the locating dowels it'll be twisted out of shape a little. when you set the intake down on it, it'll flatten out.
the pan install is clumsy and awkward but just expect that and get through it. set the intake down and get the bolts into the holes and just barely start them threading so you can wiggle the intake around until they are all started, then sugg it all up and torque to spec.
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I only saw the turkey pan and those crappy rubber seals listed for the intake, at one point. You mentioned paper gaskets. I've seen one (pan) or the other (just paper gasket), and I know if you don't use the pan the oil will coke up underneathe the intake. Perhaps you can explain.
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From: chicago burbs
the Fel-Pro turkey pan used to come with a pair of very thin paper gaskets for the ports, i don't know if they still do? the mystery was which side of the pan do they go on? i used them on the head side. i have used the pan alone without the paper gaskets but with the gaskacinch on both sides. it's kinda like rubber cement.
what was the problem you had getting the pan to seal before? vacuum leak or oil leak? both?
i found 2 part numbers but i can't find a description of what's included? MS96013 and MS96017
what was the problem you had getting the pan to seal before? vacuum leak or oil leak? both?
i found 2 part numbers but i can't find a description of what's included? MS96013 and MS96017
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both, oil and vacuum leaks. Ended up with oil and gas sitting on top of the pan. Lack of a seal, I'd say so. Last time I ordered the felpro turkey pan, it didn't come with the paper gaskets. Argh.
I checked the first part num you gave, seems to come with paper gaskets, listed for use on the 400 without the thermactor air system, which my 351m still has. So i'm assuming that it blocks the ports for it.
The second part number looks to have only the valley pan itself with those rubber seals.
I started poking around again looking for different part numbers. Found two sets for the 351C that look to come with a pan, paper gaskets and seals. M and 400 parts look only to have the pan? eh? Perhaps its a seperate part number now, or maybe the planets have aligned to hide it from view.
I checked the first part num you gave, seems to come with paper gaskets, listed for use on the 400 without the thermactor air system, which my 351m still has. So i'm assuming that it blocks the ports for it.
The second part number looks to have only the valley pan itself with those rubber seals.
I started poking around again looking for different part numbers. Found two sets for the 351C that look to come with a pan, paper gaskets and seals. M and 400 parts look only to have the pan? eh? Perhaps its a seperate part number now, or maybe the planets have aligned to hide it from view.
Last edited by ToTheFloorToGo; Dec 14, 2006 at 06:50 AM.
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Joined: Nov 2000
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From: Albuquerque
The best practice as I have read here seems to be this.
Cut the intake ports of the turkey pan off and dirll some holes in the bottom for oil drain. Use the thick paper gaskets from Mr. Gasket on the port and silicone on the end gaps.
The turkey pan blocks hot oil from the bottom of the manifold. The paper gaskets get you a good seal to the heads.
In my experience don't block the heat crossover unless you live in a very warm climate. It's not worth the performance increase.
Cut the intake ports of the turkey pan off and dirll some holes in the bottom for oil drain. Use the thick paper gaskets from Mr. Gasket on the port and silicone on the end gaps.
The turkey pan blocks hot oil from the bottom of the manifold. The paper gaskets get you a good seal to the heads.
In my experience don't block the heat crossover unless you live in a very warm climate. It's not worth the performance increase.
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