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I HAVE A 350 CHEVY ENGINE THAT HAS BEEN BOARED 10 THOUSANDS AND NOW IS OVERHEATING

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Why the bore? Thermostat ok ? Head gasket new ,heads pressure checked ,fluxed, was block checked?

Posted on Jan 30, 2017

  • Don Lamb Jan 30, 2017

    Why the bore? Thermostat ok ? Head gasket new ,heads pressure checked ,fluxed, was block checked?

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skychief2001
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SOURCE: Chevy 350 they called it the big dog from advanced auto been a good engine till now after about 50 thousand miles when pulling trailer it's like let off acc to get speed up chokes down then ck eng

So the first thing to do is get the computer scanned for trouble codes. The codes will help direct someone to the area to test.
Most auto parts stores will scan for free in hopes of selling you some parts.

Posted on Dec 18, 2012

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SOURCE: 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

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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