1939 248 exhaust heat riser valve

[39Cdan]

Hi.

Removed exhaust and intake manifolds to blast and paint. The heat riser valve is missing.

Can anyone out there suggest a source for heat riser valve replacement parts?

 

Thank you!

Kevin

 

[Dave_B]

Kevin,  they are available from Bob’s Automobilia. 

bobsautomobilia.com

Dave

[39Cdan]

Thanks Dave_B!

[Morgan Wright]

On 12/3/2017 at 4:01 PM, 39Cdan said:

Hi.

Removed exhaust and intake manifolds to blast and paint. The heat riser valve is missing.

Can anyone out there suggest a source for heat riser valve replacement parts?

 

Thank you!

Kevin

 

 

Take the manifold into the machine shop to get it milled flat and smooth. The copper manifold gasket only works if the manifold and head are both milled smooth. Otherwise you'd have to use the soft spongy gasket which just burns out.

[DonMicheletti]

If you do machine the exhaust manifold, you have to machine the intake manifold too - the bolt ears have to be the same height

[39Cdan]

Thanks Gents.

 

Follow-up opinion please -

My engine has exhibited a miss for several years, sometimes barely noticeable and sometimes jerks the car.

I have replaced all ignition parts. Also, starting the car has always left a black spot on the garage floor.

The miss lead me to pull the manifolds and make preps for pulling the head.

Can the absence of the heat riser flapper cause an engine miss?

Can the miss result from a combination of conditions: missing flapper, Carb needs rebuilt, poor valve seals?

Is one of these conditions far more likely than the others to cause a miss?

Thank you!

 

[MCHinson]

I would suspect your issue is carburetion. I suspect it is running rich. A carburetor rebuild will likely help it.