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Had a leaky intake #2932465
06/12/21 12:18 PM
06/12/21 12:18 PM
Joined: Jan 2004
Posts: 1,191
North Carolina
4
469runner Offline OP
super stock
469runner  Offline OP
super stock
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Joined: Jan 2004
Posts: 1,191
North Carolina
The intake manifold was not sealing well on this engine and it was sucking oil. It has been fixed, new plugs installed. But, the new plugs after about 150 miles look a little dark and crusty. How long does it take for the combustion chambers to clean themselves out? Engine runs great now and am using the same heat range as when engine was new.

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Re: Had a leaky intake [Re: 469runner] #2932472
06/12/21 12:49 PM
06/12/21 12:49 PM
Joined: Mar 2007
Posts: 3,129
West Coast, USA
jbc426 Offline
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jbc426  Offline
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Joined: Mar 2007
Posts: 3,129
West Coast, USA
Was machining of the manifold required or did you just reseal it successfully?

I bought a brand new Edelbrock Victor 440 intake. When I mocked it up using grease on the heads and Permatex on the manifold. I found the manifold is too wide resulting in the bottom of the ports sitting up over a 1/4" above the floor of my Indy EZ intake ports. I had a local shop cut the manifold mating faces down to make the manifold narrower and bring the port alignment into closer proximity to each other.

Prior to having it cut, I used the Hughes Intake Sealing Tech Tip to verify the angle was correct.

http://www.hughesengines.com/TechArticles/intake_manifolds_articles.php


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 3.91's (closest thing to an automatic 5 speed going)
Re: Had a leaky intake [Re: jbc426] #2932485
06/12/21 01:31 PM
06/12/21 01:31 PM
Joined: Jan 2004
Posts: 1,191
North Carolina
4
469runner Offline OP
super stock
469runner  Offline OP
super stock
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Joined: Jan 2004
Posts: 1,191
North Carolina
I did check angles and found no irregularities. Aluminum heads and aluminum intake using sheetmetal gasket/valley pan didn't do a good job sealing. Used separate valley tray and Superformance paper intake gaskets to fix.

Re: Had a leaky intake [Re: 469runner] #2932590
06/12/21 06:53 PM
06/12/21 06:53 PM
Joined: Jun 2013
Posts: 807
Oregon, U.S.A
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elmor353 Offline
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elmor353  Offline
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Joined: Jun 2013
Posts: 807
Oregon, U.S.A
I have found that aluminum doesn't like the stamped bath tub gasket without the paper gaskets sandwiching it. Cast iron heads and intakes do fine without the paper but I have never had an aluminum intake seal properly without them.

Re: Had a leaky intake [Re: elmor353] #2932598
06/12/21 07:23 PM
06/12/21 07:23 PM
Joined: Feb 2003
Posts: 2,596
Sobieski Wi
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bee1971 Offline
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bee1971  Offline
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Joined: Feb 2003
Posts: 2,596
Sobieski Wi
Had the same problem with E Street Heads and a Weiand dual plane on my 383/432 Stroker

Block was not cut , just cleaned up resurface - Made it clear to the machine shop

Used these gaskets on the head side of the valley pan , dry silicone bead side to the heads and ports then Edelbrock Gasgacinch to glue the gaskets to the bottom of tin pan itself

http://www.hughesengines.com/Index/...EJsb2NrIChMb3cgRGVjayk=&partid=33979

Intake manifold side of tin valley pan no gaskets

Has worked awesome so far this summer

My latest set of NGK 6 look great with no oil use

Makes you wonder how much of that oil if any works it’s way through the exhaust system ? Was going thru about a quart every 500 miles or so for a few summers


1971 Dodge Charger Superbee
2011 Ram Sport 1500 Quad Cab Deep Water Blue Loaded
Siberian Huskies






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