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Old 09-26-2002, 09:18 AM
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Question Boiling Noises??

I’ve got an SBC 400 (.030 over) W/ Edelbrock Performer Rpm Heads, Intake and 750 Carb. The engine runs at the thermostat (190) with 10 degrees base timing and 38 total timing. My problem is this: When I shut the motor off I can hear boiling noises coming from the top of the engine. I’m running a stock calibration on the carb so I don’t think it’s a lean condition causing this, should I go richer in cruise mode? I can let the engine idle all day and shut it off and the boiling noises don’t occur, it only happens after I've driven it for more than 10 minutes or so. Any ideas??

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Old 09-26-2002, 09:36 AM
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Sounds like air pocket. Try a higher octane gas. Why a 190 thermostat? I have to pay twice the price, but I'm running a 160.
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Old 09-26-2002, 10:38 AM
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I agree with Ted655 sounds like an air pocket, does it make this sound when you let off the throttle and sounds like it's coming from the heater core?
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Old 09-26-2002, 11:19 AM
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did you drill the 3 steam holes in the new heads and matched to the head gaskets?If this is a GM 400 block.
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Old 09-26-2002, 11:38 AM
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Yep, steam holes drilled. What about a colder plug? think that'll help get the heat out of the combustion chamber
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Old 09-26-2002, 12:41 PM
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I don't think that the plugs will make any change here,Try running just water and a water weter like Red Line
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Old 09-26-2002, 09:29 PM
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Perfectly normal behaviour for a hot rodded engine, most V8 cars will exhibit this from time to time but Chevy 400's are notorious for this due to the siamesed bores. I wouldn't worry as long as your temp gauge is reading on the thermostat, a 160 will reduce the tendency somewhat but on a hot day when you've just idled through downtown traffic she's gonna get hot and make some noise. A higher pressure cap will help a lot also by raising the boiling temp. Your hoses should be hard when it's this hot...if not your rad cap could be shot. Pressure test the system. There is nothing wrong with running 18 pds or more on that engine.
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Old 09-27-2002, 05:02 AM
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I'm using water wetter (the stuff really works!) and water. My cooling system really seems to be getting the job done but the noises after shut down are a little annoying. Thanks for your input 4JC, I think I'll try a higher pressure cap.
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Old 09-28-2002, 09:31 AM
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How about the coolant flow kit that plumbs into the heads and to the thermostat housing,This does help on the 400s with aluminum heads, does your heads have the plugs? Or this can be drilled. This helps the coolant flow from the center of the heads.
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