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Old 05-22-2017, 04:14 PM   #1
RustyBucket
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Default Heat riser valve

I think I have a simple question. If you put TBI on a 304, do you still need the heat riser valve?
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Old 05-22-2017, 06:30 PM   #2
Bill USN-1
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Default Re: Heat riser valve

No, I even closed off the cross over port when I had the manifold off.
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Old 05-22-2017, 07:01 PM   #3
RustyBucket
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Default Re: Heat riser valve

To be clear I meant the exhaust heat riser valve.

http://www.IHPartsAmerica.com/store/...egory_Code=EXH
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Old 05-22-2017, 07:13 PM   #4
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Default Re: Heat riser valve

Quote:
Originally Posted by Bill USN-1 View Post
No, I even closed off the cross over port when I had the manifold off.
Which port is that and how did you close it off?
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Old 05-23-2017, 07:40 AM   #5
Bill USN-1
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Default Re: Heat riser valve

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.
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Old 05-23-2017, 07:06 PM   #6
RustyBucket
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Default Re: Heat riser valve

Quote:
Originally Posted by Bill USN-1 View Post
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.
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Old 05-24-2017, 06:30 AM   #7
dkminors
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Default Re: Heat riser valve

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.
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Old 05-24-2017, 08:12 AM   #8
Bill USN-1
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Default Re: Heat riser valve

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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