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Pesky vacuum leak.

Posted By ErnieL 4 Years Ago
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2721955meteor
Posted 4 Years Ago
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had simler isse(57 292)4v/650 Holley. i had converted to pcv. after redoing carb gaskets and changing spacers to full divided re your las pictures.then removed pcv, routed hose from valley cover to air cleaner.cleaned the old style oil filler cap. (also my valley cover is home made alum.plate with restrictor re oil splash) problem solved. my diagnosis is hose from pcv valve to carb base to soft and fluter was the noise and vacuum leak. also use truck style intake gasket, use the exhaust  flapper in the winter, remove spring for summer.runs great now,iget the feeling of more power with the carb divided.   (ps not trying to get into pcv bull shit ,just telling what works for me)
DryLakesRacer
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What was the evidence? Did you cross torque or start at the middle and go out.

56 Vic, B'Ville 200 MPH Club Member, So Cal.
ErnieL
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Fixed!
Intake gaskets. Not sealed well at the back.



56 Meteor 4 dr hardtop
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Anna, Tx
ErnieL
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Yeah I’ve been chasing the vac leak for months. It’s irritating. Only shows up hot on decel.  The intake is the only thing I haven’t redone. 


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DryLakesRacer
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Anyone selling “Best” will hav then also they have the metal restrictors. 
Forgive me but I don’t understand the vacuum leak in that area. I use an aluminum dual quad manifold with tubes thru it for the chokes and it’s never been a problem. I looked at my BT manifold and assume the clamping washer would hold the same. If it didn’t I think you would hear exhaust ticking or noise. Thanks. 


56 Vic, B'Ville 200 MPH Club Member, So Cal.
paul2748
Posted 4 Years Ago
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CASCO sells the restricted  gaskets


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

ErnieL
Posted 4 Years Ago
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I can get them from any of the mail order houses, but nobody seems to carry Victor Reinz locally.  Fel Pro is what’s around here and they only offer the open style. 
Irritating



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PF Arcand
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Posted 4 Years Ago
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Ernie: If you can't find the Truck "restricted" intake crossover gaskets elsewhere, try "Gasket City" as advertised in Hemmings, under "G" in Services. "Al" at  Ph.# 888-335- 4686  (Eastern time) toll free or alambert@gasketcity.com   Ships out of Ontario Can.. I got mine from him some time ago..    


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ErnieL
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Interesting. OK. I’ve had open everything. One above and one below, and the noise I hear is definitely a vacuum leak. It only happens once the engine has reached full operating temp.
You may have hit on something regarding the intake gaskets though. There are signs that the ridge around the crossover restrictors was unevenly crushed. 
Do you recall the part number for the truck intake gaskets with the restricted crossover?
Im going to see if the local Summit warehouse has some before I order from a mail order house 



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Joe-JDC
Posted 4 Years Ago
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What I suggested is an open gasket under the spacer and an open gasket above the spacer.  Some folks put a four hole gasket on the bottom, and it flutters, or whistles with a open spacer.  What Ted and I found on dyno testing several combinations of spacers on the BT is the dual oval or four hole spacers work best.  Joe-JDChttp://forums.y-blocksforever.com/uploads/images/934e72aa-5efb-458c-b2e1-7f09.jpghttp://forums.y-blocksforever.com/uploads/images/7bf803f2-b061-41a5-86b7-b7ac.jpg

JDC


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