Chevy 350 Intake Manifold Gasket - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-05-2004, 02:05 PM
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Chevy 350 Intake Manifold Gasket

I have a Chevy 350 crate motor Equipped as follows.

RV Roller Cam
High Compression Pistons
No PVC Valve
No rear engine breather assembly
Front oil filler breather only
Offenhauser 3X2 BBL carb manifold new

My problem is that the rear intake manifold rubber seal to the block blew out causing an oil leaf. When the engine was put together it back fired a few times. What if anything should I check before I take the manifold off to replace the gasket so this doesn't happen again?

Thanks Bob

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Old 07-05-2004, 02:17 PM
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First of all, throw away the rubber end gaskets, and use hi temp rtv silicone instead.

You need a good crankcase ventilation system.

Get the timing set so you will not get any backfireing.

Troy
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Old 07-06-2004, 06:33 AM
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Check out this thread,and as already said, your motor (engine) needs to be vented. Best to have an intake and exhaust for your crank case, by way of a breather and a PCV Valve. If you don't have a system on it know, you are creating alot of pressure inside your crankcase, it can cause your seals to leak. If you ONLY have a PCV valve, you will create a vacuum inside the crank case, which can have a bad effect on your oiling system.

http://www.hotrodders.com/t42649.html
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Old 07-11-2004, 09:32 AM
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I purchased a PVC Valve and a rubber seal for it. A machine shop cut the Valve cover for me. I also got a new gasket set and a tube of RTV High Temp. Thanks very much for your advice. I will be putting ther engine back together this week. Bob
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Old 07-11-2004, 05:05 PM
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You will need a baffle in the valve cover under the hole to keep the PCV from sucking oil out of the engine.


Troy
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69 ss rs full custom camaro 98 ISCA grandchampion
69 ss rs bb camaro wifes driver
66 Elcamino 350/all dz parts,ac,windows,loaded,my driver
69 ss chevelle bb conv.fresh frame off
26 T sedan street rod
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