351m Under The Intake, Shield Help...
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Joined: Jan 2004
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From: Hawthorne,Ca.
351m Under The Intake, Shield Help...
1979 F150 4x4....351m....I'm removing the intake as of this minute...tomorrow installing the new Weiend. I believe I DO NOT need to reinstall the "heat shield-oil thingie" DO I ???? Thank you for your reply's.
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From: e-burg
yes u do have to use a valley pan unless u have cut off the exhaust crossover in the intake. what this does is keep the oil from "cokeing" inside the valley the manifold. ford used hot exhaust gasses and cycled them through the intake to speed warm up. that kind of heat will "coke" the oil and turn it into something simmilar to charcol really bad for ur motor. so long and short of it yes. some gasket makers have a true gasket set and a block off plate for this but it will take a lot longer to warm up i did it but i was looking for more preformance and didnt worry about the warm up time
hope this helps
hope this helps
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From: Hawthorne,Ca.
So,IF I understand correctly your saying that there is oil in the exhaust that goes through the intake and it will coke ??? But what does the pan have to do with that? I understand the blocking off part.My fel pro gaskets DO NOT block that passage.THANK YOU again for your help!!!
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From: Roseburg, OR
He's talking about the oil in the lifter valley. If you don't use the valley pan and don't block off the exhaust crossover, you'll get big crusty chunks of oil 'coked' up on the bottom of the intake manifold because of the heat. The valley pan separates the oil form the lifter valley from the hot bottom of the manifold.
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From: chicago burbs
i cut the intake sealing area off of the pan and just used the remainder of the tray under the manifold. i set it in the silicone on the end seals and drilled a few drain holes in it so it wouldn't fill up and weigh a ton. even though my intake(offy port-o-sonic) doesn't use the crossover, i didn't want the hot oil hitting or sludging up on the bottom of the cold intake.
Last edited by grclark351; Jun 5, 2005 at 02:25 AM.
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From: chicago burbs
i thought it was a pretty neat ideer when i read it, so i gave it a try the next time i did my manifold. a little bit of work to cut it right to clear the intake surface of the heads but not very hard. i found that my last two turkey pans were holding water on top of the pan under the intake and both had rusted through pinholes letting condensated moisture into the valley, so i'm done with the traditional turkey pan i think.
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