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78 F150 460 Eng In the middle of building my 460 going back with new Alum intake should i use valley pan or just intake gaskets ??? I think it will keep some heat off the intake if used give me some feedback pro's and con's
Without the valley pan the exhaust cross over bakes the oil onto on the bottom of the manifold, causing not only a mess but beats up your oil. The valley pan is there for a reason.
Most of the aftermarket manifold don't have the exhaust cross over, exception is the edelbrock performer with egr.
He didn't say which manifold he had, so you are guessing.
Oh and some aftermarket manifolds don't have the crossover but Edelbrock is the only one that "most" apply's to.
And even with the crossovers I have never had the problem that was rumored to be an issue, even the OEM's figured out it really didn't do a lot of good most times although on a lot they did bolt a smaller shield on because of the problems with leaking turkey pans.
I had a turkey pan that did not have the intake gasket incorporated into it. It's reusable, and does not interfere with the intake gaskets. If/when I do another 460, I will put it in again, I like the idea of not having a bunch of crud to clean off of the bottom of my intake when/if I take it off.
I too never use them, not even on a 400/351. I have never seen anything built up under there after removing a intake without one & I have never noticed my oil getting dirty sooner than it should.
I've seen the oil coked onto the bottom of intakes. But with motors like those it was also coked around the pushrods, the lifters, the timing chain, the oil pump, etc, etc.
The valley pan was there to try to keep the intake manifold cool relative to the rest of the engine, not to keep oil from cooking on the bottom side of it. I guess it's a nice theory, but I wonder how much of a difference it really makes. Kinda like those Edelbrock Air-Gap intakes...I can see where it MIGHT work, but how well it might work would have to be tested independently to satisfy me.
The valley pan was there to try to keep the intake manifold cool relative to the rest of the engine, not to keep oil from cooking on the bottom side of it. I guess it's a nice theory, but I wonder how much of a difference it really makes. Kinda like those Edelbrock Air-Gap intakes...I can see where it MIGHT work, but how well it might work would have to be tested independently to satisfy me.
Pat
Another peanut gallery heard from with lack of knowledge.
The valley pan was there to try to keep the intake manifold cool relative to the rest of the engine, not to keep oil from cooking on the bottom side of it. I guess it's a nice theory, but I wonder how much of a difference it really makes. Kinda like those Edelbrock Air-Gap intakes...I can see where it MIGHT work, but how well it might work would have to be tested independently to satisfy me.
Pat
After a certain amount of heat soaking they all get close to the same temps. But you can do things that slow down the process, like valley pans and Air-gap manifolds. Which matters in a drag race.
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