72Cyan
Newbie
Posts: 18
Loc: Seattle
Reg: 12-21-22
|
12-28-22 05:59 PM - Post#2852942
My 72 C10 with 350 no longer has any of the exhaust manifold heat assist to keep the choke from coming/staying on in cold temps. My carb is the stock Quadrajet 4bbl but I have Hooker headers, so I lack the stove pipe, heat riser and all those vacuum lines to operate the opening closing of the value for heat to enter the carb. Does anyone have recommendations, aside from going back to the stock manifold and finding all the parts? is there some sort of retro-fit, and if so what parts would all be required?
Dan J. C.
Seattle, Washington
1972 Chevy C10 Cheyenne, SWB, 350/350, Hawaiian Blue/Blue
71,000 original miles (rebuilt at 65k)
3 owners, Garaged since new
Respray in 2010, new carpet and seat upholstery
Undercarriage all original |
|
|
64ss409
Senior Member
Posts: 1022
Loc: Montana
Reg: 12-04-02
|
12-29-22 07:08 AM - Post#2852958
In response to 72Cyan
I got some pipe, I think 1/8 in, bent it, curved it and welded it on the outside of a header tube so the entrance and exit were close to the same place as the tube in the exhaust manifold.
Ron
1964 SS 409/340 4 spd, bought new Oct '63 from Ken Boggs Chevrolet, Geraldine, Montana
1962 SS convertible, 327/250 4 spd
1956 IH pickup, 327
|
|
 steve65
"8th Year" Gold Supporting Member
Posts: 1151
Age: 64
Loc: Langley, BC
Reg: 09-25-13
|
12-29-22 03:06 PM - Post#2852983
In response to 72Cyan
Have you tried looking into an electric choke?
I found this one on line.
https://quadrajetpower.com/electric-choke-conver si...
Can't seem to save the image from the website.
Steve
Steve Duncan
66 Impala 2dr Coupe
Sold, gone to a better home.
|
|
72Cyan
Newbie
Posts: 18
Loc: Seattle
Reg: 12-21-22
|
12-31-22 03:55 PM - Post#2853068
In response to steve65
Fascinating! it looks like this idea could work. I'll try contacting the guy and see if that might be a solution to my high idle in cold temps. Thank you for your info!
Dan J. C.
Seattle, Washington
1972 Chevy C10 Cheyenne, SWB, 350/350, Hawaiian Blue/Blue
71,000 original miles (rebuilt at 65k)
3 owners, Garaged since new
Respray in 2010, new carpet and seat upholstery
Undercarriage all original |
|
Tony1963
Frequent Contributor
Posts: 2079
Loc: Orlando Florida
Reg: 07-09-18
|
01-01-23 10:37 AM - Post#2853083
In response to 72Cyan
There were three pieces of technology that were used on the RH exhaust on a small block Chevy. Those are listed as follows:
Heat Riser
The heat riser temporarily limited exhaust from flowing out the RH exhaust manifold and routed the hot gasses under the floor of the intake to better atomize the air/fuel mixture. These were controlled by a bi-metallic spring until the early 70s, then replace by a vacuum pod that was sensitive to engine coolant temperature. This device prevents stumble and backfire in warmup. The later 70s version is known as EFE for Early Fuel Evaporation.
Heat Stove
This device created somewhat of a heat shield around the exhaust manifold and ducted warm air into the intake air stream for better atomization of fuel and was regulated by a thermostat in the air cleaner assembly. This device also prevented icing of the throttle blade as the air/fuel mixture went through the venturi where, as the fuel atomized, it lost heat changing into a vapor and could freeze the throttle. It is a necessary part of the system.
Choke Heat Source
These early versions were a steel pipe through the manifold. Later versions have the pipe sitting in a well on the intake manifold just above that crossover for the heat riser chamber described earlier.
| People fear change because it threatens what they know, or what they claim to know. |
|
|
|
|
Report Post
Quote Post
Quick Reply
|
|
Print Topic
Email Topic
639 Views
|
|
|
Gain extra benefits by becoming a Supporting Member 
