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Old 12-15-2011, 11:40 PM
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Intake manifold sludge catch pan

For your information: I have a 1969 Chevy 350 and I have taken the intake off to have the heads done. I found that there is a catch pan on the underside of the intake. I was thinking of taking it off and tossing it or taking it off so that I could get it really clean and then reinstall it. I was amazed at how much sludge was in the pan and thought that I had it pretty clean. I thought that the center of the pan was built to fit up tight to the bottom of the manifold but after prodding and scrapping I realized that the sludge was packed in and hardened so that the 5/16 or 3/8 space that should have been between the pan and bottom of the manifold was gone. I was able to bend the four tabs back enough to get in there and actually chip it away. When I took the manifold off the valley area was almost spotless so this pan really did it's job. The only draw back I see to the pan is if it should become clogged again I would think that it would transfer allot of heat to the carb. According to the paper work on the car this engine has only about 40K since being rebuilt and I think that no one cleaned the pan prior to installing the manifold. The pan is held on with four rivet head looking fasteners. I think they are probably pressed in pins with rounded heads that would have to be ground off to get the pan off. I guess they wanted to make sure that the fasteners didn't come loose and end up in the lifters.
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Old 12-15-2011, 11:48 PM
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It's a Heat Shield, keeps hot oil off Intake and from hitting where the Exhaust Crossover is on the bottom of the Intake.
They are small splined Rivets, usually can pry them out. If not grind them/ drill them out. You can use Sheet metal Screws & Locktite to reattach the Shield.
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Old 12-16-2011, 08:26 AM
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X2 on the heat shield. If you take a small dulled chisel and get under the sheet metal where the studs attach, you can tap gently upwards(the best angle you can) and the rivits will come out and the pan will come off. I've done it a lot. You can tap the holes for screws or even reuse the rivits with a little green loctite metal bond, provided they are servicable.
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Old 12-16-2011, 11:48 AM
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intake heat shield

Thanks for the information. That makes sense. It sure wasn't a heat shield anymore being packed with all that crud packed in there.
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Old 12-16-2011, 02:11 PM
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Quote:
Originally Posted by rustman
Thanks for the information. That makes sense. It sure wasn't a heat shield anymore being packed with all that crud packed in there.
Actually its a catch pan for the crud you see in it. Keeps the hot oil being cooked to carbon on the exhaust cross-over from falling back into the engine. It would be nice if it was oil tight and functioned just as a head shield, but I've yet to see one that keeps the oil out rather than just collects the ash.

Bogie
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Old 12-16-2011, 03:57 PM
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good info thanks!
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Old 12-16-2011, 05:32 PM
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I installed a Moroso Lifter Valley Oil Baffle.
Seems to do the trick, underside of manifold is always spotless.
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Old 12-18-2011, 12:04 AM
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lifter valley oil shield

Thanks mlc. I will check it out.
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