<VV> Exhaust port tube fit to manifold

[Harry Yarnell]

.031" clearance is WAY too much.
Press fit into the head is relitive; they can usually be wiggled out; tapped
in with a rubber hammer.
This isn't a 140 (hp) engine is it? Those tubes are bigger than the rest.
Also they're rather a slip fit into the manifold.

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Doug Mackintosh
Sent: Monday, September 17, 2012 12:12 PM
To: Virtual Vairs
Subject: <VV> Exhaust port tube fit to manifold

I have to replace some the exhaust port tubes in the heads of the engine I
am working on, because the donut seats are torn. I have some used tubes. 
According to the 1961 shop manual the tube ends are a press fit into the
exhaust manifold (as well as into the head). The used tubes I have are a
sloppy fit in the head (missing a press fit by as much as 0.031 inch). 
 
Any experience on the list with this. Should I use these, or do I have to
bite the bullet and purchase more used ones? I am guessing the press fit
would help with heat transfer from the tube to the exhaust manifold, but as
a practical matter, does anyone know what will actually happen if the fit is
sloppy?
 
Thanks!

-- Doug Mackintosh
Corsa member since 1996
Corsa/NC member since 1996, Virtual Vairs member Corvair owner 1969-1971 and
1996-on  _______________________________________________
This message was sent by the VirtualVairs mailing list, all copyrights are
the property of the writer, please attribute properly. For help,
mailto:vv-help at corvair.org This list sponsored by the Corvair Society of
America, http://www.corvair.org/ Post messages to: VirtualVairs at corvair.org
Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs
 _______________________________________________