• To ALL forum users - As of late I have been getting quite a few private messages with questions about build ups here on the forum, or tech questions about your personal project. While I appreciate the interest, sending me a private message about these topics distracts from, and undermines the purpose of having a forum here. During the day I wear many hats as a small business owner-operator and I work tirelessly to provide the absolute best service possible to you, our valued customer. When I created this forum I rounded up some of the best minds I knew so that any tech question you might have could be asked and answered by either myself or one of my highly experienced moderators, this way the next time this same question is asked the answer can be easily found and utilized by the next IH enthusiast having the same question. This allows me the freedom to run the day to day operations of the business and minimize the impact to shipments and shop activities that these distractions can cause. It is of the up most importance for me to complete the daily tasks in order to best take care of you our customer, all the while providing you a forum to get the level advice and input you have come to expect and deserve from the premier IH shop in the country.

    So with that I ask that anyone with a question about one of our build ups or a general tech question to please use the forum as it was intended. I am absolutely available by telephone to answer your questions as well but at times may direct you back to our website to better field your question or questions. Most other private messages I will be glad to answer for you.

    Thank you for your understanding.

    Jeff Ismail
    Owner/Operator

Heat riser valve

Bill USN-1

F.I. Moderator
Since you won't have a mech choke pull off there is no need to have exhaust flowing thru the intake manifold.
That's the purpose of that flapper valve.
The ports are on the intake manifold.
If the manifold is off then you can also run the LPG intake gaskets.
But they are not required or needed.
Just don't run the flapper if it's bad.

For others reading,
No, this does not mean you need to remove yours to install EFI.

It just means that if the flapper goes bad or is creating an exhaust leak(bad for O2 sensor) then just remove it.
 

RustyBucket

New member
Since you won't have a mech choke pull off there is no need to have exhaust flowing thru the intake manifold.
That's the purpose of that flapper valve.
The ports are on the intake manifold.
If the manifold is off then you can also run the LPG intake gaskets.
But they are not required or needed.
Just don't run the flapper if it's bad.

For others reading,
No, this does not mean you need to remove yours to install EFI.

It just means that if the flapper goes bad or is creating an exhaust leak(bad for O2 sensor) then just remove it.
Thanks for the info Bill.
 

dkminors

Member
You can remove the flapper and weld in a couple of shortened bolts to cover the holes on the flapper housing. By leaving the housing in there you won't need to address any gap between the manifold and exhaust piping.
 

Bill USN-1

F.I. Moderator
I normally just tap the holes with a NPT tap and install pipe plugs if I leave it in.
Some times the cast will crack if you weld on it.
 
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