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Electric choke replacement for divorced choke. Call them before ordering. Electric Choke
Hi
I believe that Lars knew about this. He mentioned that Tripower chokes work upside-down to other carbs. Also the list doesn't show the tripower , only SB carbs.
Any thoughtss ?
Rgds.
Hi
I believe that Lars knew about this. He mentioned that Tripower chokes work upside-down to other carbs. Also the list doesn't show the tripower , only SB carbs.
Any thoughtss ?
Rgds.
They are realy fast replying to my question and they claim having a conversion kit for the tripower.
I will order it and try it. If that works, you are eligible for a beer from me.
I do not understand all this talk about an electric choke.
The choke mounting pad looks just like many others I have seen.
Why don't you just buy the correct divorced style choke coil & shield for it?
My friend is restoring a 70 LS5 C3 for NCRS points, and mentioned he had trouble finding the correct choke setup.
I can check with him if needed.
Just PM me.
The 69 Vettes & Camaros were made for a year and a half, rolling into normal 70 production times, due to a strike. The later cars do have a few variations from earlier 69s, both Vette and Camaro. Perhaps this is one of those. Also the 70 intro of the 454 was planned to have a tri-power variant, but that died somewhere in development. That may or may not have had anything to do with the strike issues.
Here is a supposedly 70 LS5 intake with the same choke pad that you have. This number 3955287 was used on a lot of 402s and 454s in a lot of body styles for 70-71 Vette, Nova, Chevelle, Camaro. etc. The choke coil and house setup for this is out there. It does seem like GM changed all the choke setups to this style for 1970.
If memory serves me correctly this is the correct style choke house where the choke is recessed into the intake (late 60s?) The house is shorter
68-69 Intake manifold choke depression:
And this is the choke house style for the 70-71 style choke, where it fits on a flat surface.
Now admitedly, these are QJet chokes. But your 2 barrels are also Rochestor.
My 70 LT-1 had this style. IIRC there was something about the Holley coils being coiled one way and the Rochestor coils being coiled in reverse. But Rochestor 4 bbl to Rochestor 2bbl, I would call some one first to try to figure that out. The above two choke coils I believe are coiled differently, the first one is upside down so it is hard to tell. Yes, with the bolt hole down, the top coil stops high, moving up. The 2nd one stops low but with the coil curling down. They operate the rod in different directions. The second one I believe pushes the rod up when the engine is hot.
I would say your rod will be the trickiest part to find. But likely the easiest to bend up. The length of the rod varies by intake manifold height. However 69 tripower intakes and 427/454 intakes are pretty much the same height.
Mikes Carb parts would likely know.
You could always email them pics of your intake mount and a close up of the levers on your center 2 bbl.
I hope these pics help.
Last edited by leigh1322; Mar 18, 2025 at 11:03 AM.
I do not understand all this talk about an electric choke.
The choke mounting pad looks just like many others I have seen.
Why don't you just buy the correct divorced style choke coil & shield for it?
My friend is restoring a 70 LS5 C3 for NCRS points, and mentioned he had trouble finding the correct choke setup.
I can check with him if needed.
Just PM me.
The 69 Vettes & Camaros were made for a year and a half, rolling into normal 70 production times, due to a strike. The later cars do have a few variations from earlier 69s, both Vette and Camaro. Perhaps this is one of those. Also the 70 intro of the 454 was planned to have a tri-power variant, but that died somewhere in development. That may or may not have had anything to do with the strike issues.
Here is a supposedly 70 LS5 intake with the same choke pad that you have. This number 3955287 was used on a lot of 402s and 454s in a lot of body styles for 70-71 Vette, Nova, Chevelle, Camaro. etc. The choke coil and house setup for this is out there. It does seem like GM changed all the choke setups to this style for 1970.
If memory serves me correctly this is the correct style choke house where the choke is recessed into the intake (late 60s?) The house is shorter
68-69 Intake manifold choke depression:
And this is the choke house style for the 70-71 style choke, where it fits on a flat surface.
Now admitedly, these are QJet chokes. But your 2 barrels are also Rochestor.
My 70 LT-1 had this style. IIRC there was something about the Holley coils being coiled one way and the Rochestor coils being coiled in reverse. But Rochestor 4 bbl to Rochestor 2bbl, I would call some one first to try to figure that out. The above two choke coils I believe are coiled differently, the first one is upside down so it is hard to tell. Yes, with the bolt hole down, the top coil stops high, moving up. The 2nd one stops low but with the coil curling down. They operate the rod in different directions. The second one I believe pushes the rod up when the engine is hot.
I would say your rod will be the trickiest part to find. But likely the easiest to bend up. The length of the rod varies by intake manifold height. However 69 tripower intakes and 427/454 intakes are pretty much the same height.
Mikes Carb parts would likely know.
You could always email them pics of your intake mount and a close up of the levers on your center 2 bbl.
I hope these pics help.
The OP says his heat crossover passages are blocked off, so little or no heat generated to actuate the choke coil. This is why the electric choke setup is what they are after.
I missed that part. I thought he just lost it.
I ran my factory OEM divorced choke on my LT-1 for 30 years with the heat crossover blocked off.
No big deal.
Choke worked just fine.
Just needed a little adjustment.
Even started OK in 20* weather.
The coil only needs about ~100*F or so of heat to unwind.
You know, like a hot day.
I do not understand all this talk about an electric choke.
The choke mounting pad looks just like many others I have seen.
Why don't you just buy the correct divorced style choke coil & shield for it?
My friend is restoring a 70 LS5 C3 for NCRS points, and mentioned he had trouble finding the correct choke setup.
I can check with him if needed.
Just PM me.
The 69 Vettes & Camaros were made for a year and a half, rolling into normal 70 production times, due to a strike. The later cars do have a few variations from earlier 69s, both Vette and Camaro. Perhaps this is one of those. Also the 70 intro of the 454 was planned to have a tri-power variant, but that died somewhere in development. That may or may not have had anything to do with the strike issues.
Here is a supposedly 70 LS5 intake with the same choke pad that you have. This number 3955287 was used on a lot of 402s and 454s in a lot of body styles for 70-71 Vette, Nova, Chevelle, Camaro. etc. The choke coil and house setup for this is out there. It does seem like GM changed all the choke setups to this style for 1970.
If memory serves me correctly this is the correct style choke house where the choke is recessed into the intake (late 60s?) The house is shorter
68-69 Intake manifold choke depression:
And this is the choke house style for the 70-71 style choke, where it fits on a flat surface.
Now admitedly, these are QJet chokes. But your 2 barrels are also Rochestor.
My 70 LT-1 had this style. IIRC there was something about the Holley coils being coiled one way and the Rochestor coils being coiled in reverse. But Rochestor 4 bbl to Rochestor 2bbl, I would call some one first to try to figure that out. The above two choke coils I believe are coiled differently, the first one is upside down so it is hard to tell. Yes, with the bolt hole down, the top coil stops high, moving up. The 2nd one stops low but with the coil curling down. They operate the rod in different directions. The second one I believe pushes the rod up when the engine is hot.
I would say your rod will be the trickiest part to find. But likely the easiest to bend up. The length of the rod varies by intake manifold height. However 69 tripower intakes and 427/454 intakes are pretty much the same height.
Mikes Carb parts would likely know.
You could always email them pics of your intake mount and a close up of the levers on your center 2 bbl.
I hope these pics help.
Are YOU SERIOUS ?? I DON'T believe this !!
Corvette 3x2 carbs ARE HOLLEYS NOT Rochesters !
I do not understand all this talk about an electric choke.
The choke mounting pad looks just like many others I have seen.
Why don't you just buy the correct divorced style choke coil & shield for it?
My friend is restoring a 70 LS5 C3 for NCRS points, and mentioned he had trouble finding the correct choke setup. GET YOUR FRIEND TO PM Meeeee - QIK59 !
I can check with him if needed.
Just PM me.
The 69 Vettes & Camaros were made for a year and a half, rolling into normal 70 production times, due to a strike. The later cars do have a few variations from earlier 69s, both Vette and Camaro. Perhaps this is one of those. Also the 70 intro of the 454 was planned to have a tri-power variant, but that died somewhere in development. That may or may not have had anything to do with the strike issues.
Here is a supposedly 70 LS5 intake with the same choke pad that you have. This number 3955287 was used on a lot of 402s and 454s in a lot of body styles for 70-71 Vette, Nova, Chevelle, Camaro. etc. The choke coil and house setup for this is out there. It does seem like GM changed all the choke setups to this style for 1970.
If memory serves me correctly this is the correct style choke house where the choke is recessed into the intake (late 60s?) The house is shorter
68-69 Intake manifold choke depression:
And this is the choke house style for the 70-71 style choke, where it fits on a flat surface.
Now admitedly, these are QJet chokes. But your 2 barrels are also Rochestor. REALLY ??? Wow !!
My 70 LT-1 had this style. IIRC there was something about the Holley coils being coiled one way and the Rochestor coils being coiled in reverse. But Rochestor 4 bbl to Rochestor 2bbl, I would call some one first to try to figure that out. The above two choke coils I believe are coiled differently, the first one is upside down so it is hard to tell. Yes, with the bolt hole down, the top coil stops high, moving up. The 2nd one stops low but with the coil curling down. They operate the rod in different directions. The second one I believe pushes the rod up when the engine is hot.
I would say your rod will be the trickiest part to find. But likely the easiest to bend up. The length of the rod varies by intake manifold height. However 69 tripower intakes and 427/454 intakes are pretty much the same height.
Mikes Carb parts would likely know.
You could always email them pics of your intake mount and a close up of the levers on your center 2 bbl.
I hope these pics help.
TELL YOUR FRIEND TO PM ME - I HAVE a 1970 LS5 choke assembly - NOS !
I missed that part. I thought he just lost it.
I ran my factory OEM divorced choke on my LT-1 for 30 years with the heat crossover blocked off.
No big deal.
Choke worked just fine.
Just needed a little adjustment.
Even started OK in 20* weather.
The coil only needs about ~100*F or so of heat to unwind.
You know, like a hot day.
No worries Leigh, If all else fails, a manual choke might be a consideration.
I do have the original choke , but with the crossover blocked, it just doesn't work or takes far too long and running around at 1400 rpm idle isn't that cool.
I ordered the electric choke and hope it will solve this minor issue. Will let you know .
Thanks for all help . You are great and so is this forum.
Small update on my electric choke conversion of the 68 tripower.
I got a choke kit that as per Mike's carburator shop should fit .
Unfortunately, it doesn't. The choke base plate is far away from fitting . Mike tried to find a solution , but after a couple of days, I decided to
manufacture my own base plate , shortened the actuating rod and made all fit.
And it seams to work. The car starts like a champ now with the choke fully closed and as soon as it starts, the choke is opened up a touch by a vacuum can and
opens slowly by the bimetal electrically heated ,within a minute to fully open. The choke stays in the slightly open position held by this vacuum can until I touch the gas pedal that mechanically
releases the choke to open to the present bimetall positiontill till fully open.
Sunday I will drive to an oldimer meeting and I hope all works fine. Long term will tell.
Thanks for all info and help here. You guys are great.
