Choke thermostat help needed

[krivman65]

Hi all, I recently picked up a "new" exhaust manifold for my '65 because mine is cracked. From what I understand, the choke thermostat is different between the years. My car has the factory Holley 1bbl on it, and I am hoping someone has done this before... Is there a choke thermostat that I can rig up to work between the old Holley carburetor and the newer exhaust manifold?

Thanks!!

 

[Duggie]

So your "new" exhaust manifold doesn't have the heat well your old one has?

I'm just finishing up converting my '64 Slant from the stock 1920 Holley and exhaust to a BBD two barrel carb and Clifford shorty tube headers. Not having the factory heat well anymore, I cut up a piece of scrap 3/16" steel plate with a Harbor Freight grinder and made this mounting plate for the heat well electric choke conversion I was already using on the Holley 1920.

I've read that my 1920 electric choke spring rotates the wrong direction to work with my new BBD. Once I reconnect the battery power and I prove that this electric coil spring won't work with my BBD, I may have a deal to offer on this 1920 electric choke.

 

[krivman65]

So your "new" exhaust manifold doesn't have the heat well your old one has?

I'm just finishing up converting my '64 Slant from the stock 1920 Holley and exhaust to a BBD two barrel carb and Clifford shorty tube headers. Not having the factory heat well anymore, I cut up a piece of scrap 3/16" steel plate with a Harbor Freight grinder and made this mounting plate for the heat well electric choke conversion I was already using on the Holley 1920.
View attachment 1715900740

I've read that my 1920 electric choke spring rotates the wrong direction to work with my new BBD. Once I reconnect the battery power and I prove that this electric coil spring won't work with my BBD, I may have a deal to offer on this 1920 electric choke.

If you decide to part with it, what will it include?

 

[Inertia]

Reverse the coil on it's pivot point .
Nice work .

 

[Duggie]

If you decide to part with it, what will it include?

The conversion kit came with the electric coil in a housing that bolted to the factory heat well's threaded holes and a wired in little black box. The little black box is wired to the firewall. I should have the instructions in a file.

 

[Duggie]

Reverse the coil on it's pivot point .
Nice work .

I was wondering if that would work! I was going to hook the little black box up to a set of battery jumper wires to see what's going on.

@krivman65 I'll look up the supplier for the electric choke conversion kit.

 

[RustyRatRod]

You reckon you might can include a picture of the replacement exhaust manifold's choke stove area, since that's what your question is about?

 

[Duggie]

The lead for the electric choke came from @slantsixdan. Anybody surprised?
Electric Choke Conversion Kits - Slant Six Forum

 

[Inertia]

There was a porcelain switch on the manifold that shut off the power when the engine gets hot.

1969 mopar 6 cyl choke control - Bing

You could prob hook up a rear defrost timer as alternative .

 

[Duggie]

There was a porcelain switch on the manifold that shut off the power when the engine gets hot.

1969 mopar 6 cyl choke control - Bing

You could prob hook up a rear defrost timer as alternative .

I wonder if that's what the little black box is that came with the conversion kit?

 

[Duggie]

I wonder if that's what the little black box is that came with the conversion kit?

Wait a second. If the coil doesn't stay hot the choke would close. This head cold is a drag...

 

[Inertia]

Install it, check for power to coil when hot . ? ?

 

[Duggie]

Install it, check for power to coil when hot . ? ?

Yep, thought I would check it as is with a volt meter and then run a jumper from the battery so I don't toast the ignition.

 

[krivman65]

You reckon you might can include a picture of the replacement exhaust manifold's choke stove area, since that's what your question is about?

Lol yeah, I realized that later, thinking just pictures of the numbers would help. I will post one or two up in a bit.

 

[krivman65]

You reckon you might can include a picture of the replacement exhaust manifold's choke stove area, since that's what your question is about?

You reckon you might can include a picture of the replacement exhaust manifold's choke stove area, since that's what your question is about?

Here you go!

 

[slantsixdan]

There was a porcelain switch on the manifold that shut off the power when the engine gets hot.

Yes, the choke heater modulator. starting in 1973 (not 1969).

You could prob hook up a rear defrost timer as alternative .

No, totally different animal.

I wonder if that's what the little black box is that came with the conversion kit?

Similar idea, but not quite the same part. The '73-up factory choke modulator adjusts power on the feed side of the choke heater, which has a constant ground. The black box that comes with the choke kit adjusts resistance (in accord with engine temperature) on the ground side of the choke heater, which has a constant feed with ignition on. You can fine-tune the behaviour of the aftermarket electric choke by choosing where to locate the ground modulator. I usually used the rear one of the two threaded holes facing the sky on the cylinder head, just inboard of the manifold mounting plane.