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Old 06-16-2008, 06:34 AM
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Carburator Boiling Over

Stock 302 with stock cast iron intake and 2bbl. Runs pretty good, but if it's warmed up and you stop the engine for a while it doesn't want to restart. I could hear the gas in the bowl boiling and see gas overflowing into the carb throat and flooding the intake, that's why it's hard starting. Why would it heat up like that though? It's pretty much a stock setup with a 1" aluminum spacer. My engine running too hot?

I'm wondering if it's the choke stove. There's a clamp to hold one of the heater hoses next to the choke stove so the choke will open when the coolant warms up. Maybe it's overheating the carb?
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Old 06-16-2008, 07:31 AM
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You need to get rid the aluminum space and replace it with phenolic space. tThe aluminum space will transfer heat to the carb and cause the gas to boil and Phenolic space insulate from heat transfer.
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Old 06-16-2008, 07:47 AM
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The spacer is also stock. Do you think this must have been a problem from the factory?
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Old 06-16-2008, 08:14 AM
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The gasket I used on my '66 when I ran a 2 barrel was about 3/8" thick, but I didn't run a spacer. When I used the normal 1/8" gasket, I would run into the same problems you are having. Not sure if the thick gasket can be used with your spacer or not, but it is worth a shot, they're cheap and usually available at the parts stores. I'll see if I can dig up a part number.
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Old 06-16-2008, 08:14 AM
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The aluminum spacer should cause no issue at all.. sure it will transfer heat but so will all the engines with carbs mounted directly on the intake.

It's probably the coolant hose running to close to the carb body
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