no intake valley pan

[bobbowtie]

rebuilding my 360 and don't want to use one of those valley pan things just intake gaskets. whad do ya think?

 

[JR74CJ5]

This may be a noob question / reply, but does it not serve a specific purpose?

And why would you not want to use one?

I've only ever re-built 1 motor, so I am not sure either way...

 

[bobbowtie]

i don't see what what use it has tell me convince me and i will use one.

 

[bobbowtie]

ya a noob to amc motors is this THE gasket or something else?

 

[JR74CJ5]

Is a valley pan gasket really needed? [Archive] - International Full Size Jeep Association

amc 360 valley pan gasket - JeepForum.com

AMC 304 Intake manifold

General consensus I see is it's purpose is to keep hot oil from splashing up to the PVC valve and intake bottom. Keeping the intake colder gets better efficiency ?

These above links were from a quick Google search of:

"what is the purpose of an oil valley pan in AMC motor"

You should be able to find more too if you desire, these were just from the first p[age of the search, a better search request or more in depth reading might help you more...

Other than that, as I said, I am no expert, so if the other guys here know more, disagree etc,

And didn't mean your question was a noob questions... meant mine to you may have been...

~ JR

 

[albatros 3]

The valley pan help keeps oil off the intake manifold and keeps the manifold cooler and bafflers the oil back down into the motor. You don't have to use it if that's the way you want to go. Some prefer to go without it since it's one less thing to install and worry about leaks.

 

[derf]

General consensus I see is it's purpose is to keep hot oil from splashing up to the PVC valve and intake bottom.

It keeps hot oil off the PCV too.

But yeah, the PCV valve just sticks through the manifold and is exposed to the top of the lifter valley. The valve is supposed to reduce the amount of fluid being sucked in while getting more of the exhaust gases but it's only so effective. It's not a huge concern since the lifter valley covers most of the moving parts that sling oil up. But the oil does drain from the heads into the lifter valley and some does get splashed around through the holes in the lifter valley. The valley pan does shield the valve from being splashed on directly.

Also, there is an exhaust crossover passage that runs along the bottom of the manifold for the EGR system. Splashing hot oil on it can burn the oil causing carbon buildup. Having the valley pan reduces the quantity of oil that hits the really hot exhaust passage.

A lot of people say that keeping the oil off the manifold reduces the temp of the manifold, improving the density of the incoming air. But with the EGR system blowing hot exhaust through the manifold, the heat from the oil doesn't make all that much difference.

Personally, I alway use a valley pan when I put an intake on an AMC V8. I've never had one leak and they always bolt up fine. I did try once to use a "regular" intake manifold gasket like they use on a small block Chevy. It wasn't all that thick but it was enough that the bolt holes on the manifold wouldn't line up and I couldn't get all of them started at the same time. Switched to a metal valley pan gasket and it went in with no problems. I usually pitch the rubber ends that go between the heads and instead go with a big bead of RTV. That seals a lot better than those crappy rubber pieces.

Just make sure you use RTV on at least the water ports and the metal valley pan gasket works just fine.

 

[bobbowtie]

Thanks guys that's the info i was looking for. Bob