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I'd like to get the heat choke working on my 77. I'm unsure as to what parts I'm missing. Maybe someone can help me. Pictures are super helpful! I believe I already have the intake manifold heat choke tube (shown with green circle). Thinking I only need tube going to choke assembly and tube going to carb. Am I missing anything else? Also, what is supposed to go where the yellow circle is? Thanks in advance!
Last edited by bleverman; Sep 26, 2020 at 07:48 PM.
Along with the missing EGR valve I see 4 other parts.
It looks like you have the lower choke tube installed. Part Number 343769. To be sure it is clear, blow a little compressed air through it.
1. The fresh air tube. Part Number 14006748 1975-1980. I don't think this tube is being reproduced.
2. The Upper choke tube. Part Number 355918 1976-1980. Check corvette vendors. I think this is being reproduced.
3. High Temp hose (Silicone). I don't have the number off hand. Make sure a replacement is made of something other rubber. The steel tube gets real hot.
4. Is just a standard vacuum hose.
You know, at this point you could easily install a 2101 Performer with 1204 gaskets that block the heat riser and convert to electric choke....it is a Non-EGR intake and about 1/2 the weight.....a small perfromance improvement too.
The original heat riser system is a miserable thing.......spend the money you would spend resurrecting this terrible system on a real intake manifold and electric choke. Put a heat rise valve delete spacer in the passenger exhaust manifold too.....you will be glad you did.....it is not a question of if this will fail, it is a question of when.
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77 factory heat choke question
