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Old 03-19-2007, 09:55 PM
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350 vortec cooling problem

Ive recently built a mud truck that has a 350 vortec (TB) converted into carb it has a dodge dakota radiator from a 5.2 ltr with a 16" electric fan i was just wondering do i need to go to a Aluminum 4 core with twin fans? its making me angry because all my buddies are trail riding and i cant go because it heats up and pisses into the over flow within 10 minutes of me driving it. I also didnt check the timing when i put it in time could that be a factor? When i put the intake on i also used normal 350 gaskets would the gaskets for a vortec have different port holes? maybe 2 fans one in forward and one in reverse. or could it be not getting enough air into the motor? any suggestions would be appreciated

Thanks

Ed

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Old 03-20-2007, 12:59 AM
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Need more info: What type thermo stat and temp, conditions of radator,any milky oil, runninr 50/50 antifreez, etc... Any info will help
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Old 03-20-2007, 05:55 AM
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its a reconditioned rad thermostat is 195f i mixed my coolant 3 coolant to one water the coolant isnt milky but everytime i get it hot and the termo releases to cool it blows right into my over flow
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Old 03-20-2007, 07:28 AM
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Your mixture should be 50/50. The more coolent you use does not help to keep it cool. I ran straight coolent once and really blew my engine when it overheated. Before you start it again remove the rad cap and keep watching the water, once it warms up you should see it moving around, if not then it the waterpump, another thig to try is run the car up on a set of ramps and open the radator cap, if there is air in the system it will come out.
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Old 03-20-2007, 08:03 AM
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Generally the rad cap needs to be higher than the thermostat, this removes air from the system when the engine is running. To be honest 10 minutes then puking water seems to be fast. Have you ran a pressure test on the system or checked for exhaust gas in the system? If not do the rad hoses build pressure before the engine is up to temp? if so you may have a cracked head or blown head gasket.
As noted above, check for circulation.
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Old 03-20-2007, 08:07 AM
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Lots of things can cause it to run hot. I have a few questions, what year is the engine? When you swapped it over to a carb what distributor did you use? Lean fuel mixtures, vacuum leaks, slow timing, lack of vacuum advance, all can cause it to run hot. Just need more info, give the info and we`ll solve your issue.
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Old 03-20-2007, 03:58 PM
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the motor is a 1995 from a chevy express 2500 series van it has a MSD 65000 volt distributor i havent check the vacuum lines yet so it may have bad vaccums... i havent checked the timing it maybe running lean and the head gaskets arent gone there brand new
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Old 03-20-2007, 09:50 PM
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Whats the temp. when it pukes? if its not too hot then I would change the rad. cap. Some of them are only 7-11 lbs. You probably should use one in the 16-20 lb. catagory, if your rad. can handle the pressure.
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Old 03-21-2007, 05:17 AM
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thanks to everyone that has helped me out i need a new radiator it is a 7-11 lbs rad so im going to go down to the local part stort and order a aluminum 16-20lbs pressure rad thanks again everyone


Ed
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Old 03-21-2007, 08:29 AM
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what??? how do you know that??
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