340 Heat Riser...another question

[Demonx2]

Working on my 71 Demon 340. The exhaust manifold has the heat riser valve but I see no need for it given how this car will be used. But it needs to look right so I want the external round weight to remain intact. I've read about every post on this I could find but have a simple question I didn't find an answer to.

In order to keep the flapper valve in the open position, why not just tack weld the shaft to the bushing with the flapper open and call it good? Any drawbacks to that from anyone that's been there, done that?

 

[72Dart6pack]

Only if it's done on the Kitchen table is it acceptable. Otherwise No!

 

[MoparMike1974]

A small tack on the inside is all it needs.

 

[j_anderson]

Working on my 71 Demon 340. The exhaust manifold has the heat riser valve but I see no need for it given how this car will be used. But it needs to look right so I want the external round weight to remain intact. I've read about every post on this I could find but have a simple question I didn't find an answer to.

In order to keep the flapper valve in the open position, why not just tack weld the shaft to the bushing with the flapper open and call it good? Any drawbacks to that from anyone that's been there, done that?
View attachment 1715901573

That's what I had done to mine

 

[Demonx2]

Thx for the replies, that's what I'll plan to do. Give it a tack weld and send it.

 

[AJ/FormS]

Everybody is always going on about the sound of the 340 cam, but, I bet most of that sound came from the flapper valve bouncing off the stop. I loved it too..