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Old 06-23-2013, 08:43 AM   #1
jcramsey
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250 L6 exhaust manifold question

Do all Inline 6 exhaust manifolds have an open top that bolts to the intake and Does anyone sell a cover plate to block this off? Currently running headers but am looking to switch back to stock exhaust with my offenhauser intake.

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Old 06-23-2013, 11:06 AM   #2
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Re: 250 L6 exhaust manifold question

The big trucks have a gasket that covers the hole opening. You will probably have to make a plate to cover it.
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Old 06-23-2013, 11:20 AM   #3
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Re: 250 L6 exhaust manifold question

Fel-Pro gasket set # MS 9786 includes a block-off gasket. I paid 8 bucks and change for the set at Advance Auto last week.
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Old 06-23-2013, 03:43 PM   #4
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Re: 250 L6 exhaust manifold question

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Originally Posted by vinco View Post
Fel-Pro gasket set # MS 9786 includes a block-off gasket. I paid 8 bucks and change for the set at Advance Auto last week.
That's good to know, thanks! Is it standard gasket type material or is it plate? Seems like it would need something strong enough to block the hole, or does the exhaust bolt to the Offy like stock intake does? Not home today and haven't had a chance to look at it.

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Old 06-23-2013, 08:34 PM   #5
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Re: 250 L6 exhaust manifold question

It's the metallic, perforated-looking material that you find in pretty much all factory-style exhaust gaskets, but one side is solid. It's not what you'd call a plate, though. We'll probably need pictures of the Offy.
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Old 06-24-2013, 10:52 AM   #6
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Re: 250 L6 exhaust manifold question

Your offenhouser intake is made to bolt onto the stock exhaust system. There are no purchasable block off plates and if you don't bolt the intake to the exhaust you would have to hook up a water heating system. Offenhouser come from the factory from triple one barrels to a single four barrel, all are made to bolt to the stock exhaust or be used with haeders.
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Old 06-24-2013, 11:13 AM   #7
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Re: 250 L6 exhaust manifold question

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Originally Posted by T.J. MCCAULEY View Post
Your offenhouser intake is made to bolt onto the stock exhaust system. There are no purchasable block off plates and if you don't bolt the intake to the exhaust you would have to hook up a water heating system. Offenhouser come from the factory from triple one barrels to a single four barrel, all are made to bolt to the stock exhaust or be used with haeders.
Thanks TJ thats what I needed to hear! looks like I'll be headin back to the junkyard this weekend.
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