250 L6 exhaust manifold question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jcramsey · 06-23-2013, 08:43 AM

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.

Thanks!
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Wrenchbender Ret · 06-23-2013, 11:06 AM

The big trucks have a gasket that covers the hole opening. You will probably have to make a plate to cover it.

vinco · 06-23-2013, 11:20 AM

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.

jcramsey · 06-23-2013, 03:43 PM

Quote:

Originally Posted by vinco

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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vinco · 06-23-2013, 08:34 PM

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.

TJ's Chevy · 06-24-2013, 10:52 AM

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.

jcramsey · 06-24-2013, 11:13 AM

Quote:

Originally Posted by T.J. MCCAULEY

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.

06-23-2013, 08:43 AM	#1
jcramsey Registered User Join Date: Jun 2011 Location: Marion, NC Posts: 851	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. Thanks! Posted via Mobile Device __________________ The Egg Hauler The Government Mule

06-23-2013, 11:06 AM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	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.

06-23-2013, 11:20 AM	#3
vinco Registered User Join Date: Jun 2013 Location: Hot Springs, Arkansas Posts: 17	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.

06-23-2013, 08:34 PM	#5
vinco Registered User Join Date: Jun 2013 Location: Hot Springs, Arkansas Posts: 17	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.

06-24-2013, 10:52 AM	#6
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	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. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

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