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Old 05-21-2019, 06:35 PM
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ID this part

Can anyone tell what i circled in black. I thought it was the egr but when i look it up it shows the oval port one at o'Reilly's. Thanks for the help
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Old 05-21-2019, 06:45 PM
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Heat riser for the orgional thermostatic choke on the carb.

Heat rose from the tubes and opened the choke. The tubes break over time so manufacturers went to electric or manual. If you want to be orgional they sell replacment tubes for the orgional choke. Otherwise just block it off with a piece of steel drilled for the bolts.
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Old 05-21-2019, 07:05 PM
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I tried to find it by that name but all i find is parts that go to the exhaust. This port sits next to the carb
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Old 05-21-2019, 07:58 PM
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Cerial is right, that is the mid to late 1970's hot air thermal choke stat loop fitting.
It has a short loop of tubing off the backside of it sticking down into the exhaust crossover port in the intake manifold and cylinder head.
It would originally have been used with a carb that had 2 metal tubes going to the choke thermostat housing on the carb. The carb pulled air through the tubing loop to be heated and then it was pulled into the choke thermostat spring housing to warm it up and open the choke.

Earlier version of this intake would have a flat pad cast right there, and the bimetallic spring inside a small tin box cover would have bolted down there, with a linkage arm going to the carb choke mechanism.

Later intakes eliminate any exhaust heated choke mechanism and used an electric choke right on the carb.
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Old 05-21-2019, 09:19 PM
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Pic in here of a hot air choke piping.
It’s for a sbc but bbc is similar.
https://www.chevelles.com/techref/Ad...tic_Chokes.htm
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