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393w Stroker running hot. NEED HELP!

3435 Views 10 Replies 3 Participants Last post by  SEULDR
Ok, Just got the motor in and man does she sound AWESOME!!! WOW!! is all I can say. One problem though, After a few minutes at idle the temp creeps up to around 200-210. I shut it off and wait for the electric fan to cool it down. What is the problem???

Here's what I've got: Aluminum radiator with an electric fan, new high volume aluminum water pump, no shroud and running a serpentine belt system. Motor is a brand new 393w stroker with aluminum heads so I don't want it to get too hot.

What am I missing????? :headscratch::headscratch::headscratch::scratchchin
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Is the thermostat sticking? That has happened to me before. You can always pull the thermostat out and try running it without one to see if there is a difference in operating temps.
This may sound like a dumb question, but is the waterpump turning in the right direction? If you have a serpentine belt system... I have heard of the belts getting routed incorrectly and turning the accessories backward. My friend runs a repair service and has told me some good stories about things like that happening.
I would check the manufacturer's website for the waterpump rotation direction since it is an aftermarket unit.
As for the air pockets, I was told to drain the block and start over by adding coolant while the car is running with radiator cap removed so the system is not under pressure until it is full. Then put the cap on and check for leaks.
Post some photos of your Mustang on the forum when you have time. Looks like a nice ride. What year is it? 67? What type of transmission and rearend gearing are you running?
Nice 'Stang. Did you build the engine or is it a crate motor or speed shop build? I hope you have some extra rubber in the garage. By the sounds of it, you'll need it.:gringreen
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