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My 350 chevy engine has been bored 10 thousands and I have it in a1960 chevy pickupand it gets hot setting at an idle. Have put a new 3 core radiator on it and also have an electric fan

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  • Cars & Trucks Master
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A .010" bore is not an big bore and will have little or no effect on engine temperature or performance
check on friction problems by removing the plugs and turning the crank by hand . it should be firm but easy to turn
if it is tight and requires a large spanner to turn , then the big end and main bearings will be a problem ( incorrect bearing caps fitted to conrods or excessive bearing crush) a 3 core radiator will be sufficient for cooling the water and the water pump will be doing the job
so now we have to consider the obvious
over heating at idle can be from:-
1-- incorrect ignition timing---10 to 12 degrees bdtc is standard
2-- vacuum leaks---manifold gaskets moved during assembly, incorrect bolt torquing sequence, carby gasket leaking , vacuum hoses leaking , vacuum advance diaphragm leak
3-- air/ fuel mixture too lean-- adjust the needles to correct the mixture
4--- thermostat incorrectly installed --- body to face the head water
5-- no thermostat--- water circulating too fast to allow heat transfer through the radiator fins 6 -- air lock in the cooling system
6--- head gasket not correctly fitted--- cooling holes blocked
7-- head tension not correct --- stud holes not properly cleaned out and bottoming out the studs( studs are tensioning but not stretching correctly
8-- reusing old head studs -- studs weak and h not holding the tension
9-- valve timing-- one tooth out in the valve timing
at this point I would be considering the following
thermostat installation and the stud holes not being properly cleaned resulting in the head not tight enough on the gasket

Posted on Dec 20, 2016

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That muck of a bore thins out the cylinder walls a lot and creates lot more heat look for a four core radiator and dual fans to try to exchange the heat load

Posted on Dec 20, 2016

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  • Cars & Trucks Master
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Dear Bobby,
Here are some ideas for you.
You might want to start by asking some mechanics if they think there is something wrong inside the engine causing your overheating.
If so, something may be failing, like bearings, or perhaps there is a tiny crack.
If they do not think so, here are a few other items.
Some people might try a heavy duty water pump.
Some try adding yet another radiator for more cooling. ( I have seen some mount another radiator in the truck bed, my next door neighbor did.)
Be sure your lower radiator hose is not sucking together.
Sometimes the coil spring inside the hose can slip or rust leaving a section of the hose to collapse..
You might not see this happening unless you looked for it.
Be sure your water pump/fan belt is not slipping.
Be sure your engine block is not rusty inside.
God bless your efforts.

Posted on Dec 20, 2016

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