Author Topic: 346 manifold gasket  (Read 280 times)

Offline toybox

  • Posts: 71
  • Name: Tim Walker
346 manifold gasket
« on: August 22, 2021, 10:18:08 PM »
 Hi All,   Anyone have problems with there flathead manifolds blowing the exhaust ports that go to intake ? I have had this happen twice in under 5000 miles. I had the intake milled flat after the first time thinking that was part of the problem. Any ideas ?    Thanks, Tim

Offline tripwire

  • Posts: 310
  • Name: Wes Paro
Re: 346 manifold gasket
« Reply #1 on: August 23, 2021, 12:30:31 PM »
Tim,
There are several discussions here regarding exhaust leaks between the intake manifold & block on these engines. Have you looked at any of them?

Is it possible this is what you are experiencing?

http://forums.cadillaclasalleclub.org/index.php?topic=158075.msg448142#msg448142

http://forums.cadillaclasalleclub.org/index.php?topic=162489.msg480387#msg480387

http://forums.cadillaclasalleclub.org/index.php?topic=159810.msg461331#msg461331

http://forums.cadillaclasalleclub.org/index.php?topic=149337.msg391043#msg391043

http://forums.cadillaclasalleclub.org/index.php?topic=160293.msg464728#msg464728

http://forums.cadillaclasalleclub.org/index.php?topic=154652.msg424195#msg424195

http://forums.cadillaclasalleclub.org/index.php?topic=151024.msg407338#msg407338

It seems there are a few suggestions for repairing this.  Machining the surfaces, gaskets with sealant, RemFlex Gaskets, build up the area with PyroPutty, and on & on.

Wes in VT
Driving now:
2013 CTS4 Performance Coupe
1940 LaSalle 5229 C4D

A few I used to drive:
1976 Cadillac Ambulance
1969 Cadillac Hearse, Superior Body
1966 Buick Wildcat Hearse
1957 Ford Thunderbird x 3, 1 E code, 2 D code
1956 Oldsmobile Rocket 88 Sedan
1949 Mercury Convertible
1949 Mercury Coupe, Mild Custom
1936 Buick Special Sedan

 

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