The holes should be bent so that the aft side is in and

the outside,

forward, is bent out, Virg

Yvon Cournoyer wrote:

That is unclear to me. A simple drawing would be nice.
Yvon.

Yvon,

    Perhaps this  drawing would help.   The effect can be created

by

sticking a steel rod in the hole toward the front of the tube and

working it

back and forth longitudinally to force the rear edge of the hole

into the

tube and the front edge of the hole outward.  The distorted hole

would then

be better able to "catch" the exhaust gas and direct it through

the hole to

the outside of the tube.

Ed Anderson

        Not bad, Thanks, Virg

 
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