what is the highest temp a 350 chevy should run at
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    I'm a grown up member now ! 50dodge's Avatar
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    what is the highest temp a 350 chevy should run at

    i have a rebuilt 350 chevy that is running hot, i understand that a rebuilt engine can run at about 25 percent hotter than normal.
    so if it normally runs at 195-200 you will get about 245-250,,,,,just after 250 it boils over.....any suggestions???
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    Official RnS Addict Zody's Avatar
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    Quote Originally Posted by 50dodge View Post
    i have a rebuilt 350 chevy that is running hot, i understand that a rebuilt engine can run at about 25 percent hotter than normal.
    so if it normally runs at 195-200 you will get about 245-250,,,,,just after 250 it boils over.....any suggestions???
    In my opinion 245 is way to hot, I would start to worry about gearbox if it was auto
    sbc norm is 185/190,,,in hot weathers, sitting in traffic may reach 205/210 which is a max you want it to go really.

    Possible causes: thermostat deg,water pump,radiator,fan, antifreeze, etc etc
    The car is open, the keys are under the dog !
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    I'm a grown up member now ! 50dodge's Avatar
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    thermostat is new, and it ran hot even when i pulled the stat, water pump is not that old and operated ok before the engine change, anti freeze is a 50/50 mix, electric fan seems to work ok
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    Off the Xmas card list kapri's Avatar
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    Try this logical troubleshooting guide and it will help pinpoint the issue.

    UK Hot Rods: News, tech, chat, email group for hot rods, street rods and kustoms
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    Nice basic tech article Kapri. If that doesn't help, try this below. So first off, two questions.

    1. Does it only get hot at idle or slow moving traffic? If so, is the electric fan shrouded and is it big enough for your rad?

    2. Does it heat up even when at cruising rpm at high speeds, such as a low throttle run down a highway? If so is the radiator large enough for your engine's requirements?

    Can start with that, and then see if we cannot figure it out from there. Often a rebuild running hot can be do more for the assembly. I have rebuilt numerous engines and properly done, have not seen any temperature change. After all, when temperature reaches whatever your thermostat is set at, then it should be opening, and then coolant to radiator, fan/vehicle motion moves air through radiator. It is amazing how a simple thing can cause overheat. Know of a chevelle. Was overheating on a performance rebuild, couldn't figure out. High capacity radiator, good waterpump and circulation. It turned out that the fan blade was an inch too small for the shroud so when idling or going slow, the fan was just cycling the air instead of drawing it through the radiator.
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    Official RnS Addict biff.bailey's Avatar
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    Ok, you re built the motor, stupid question, but did you change the freeze plugs and flush out the block?
    (the reason i ask is, my old torino always ran a bit hot, when it was time to pull the motor and re build it, i found out why, the water jacket was full of crud and the cylinder liners were effectively siamesed because of it.)
    is there a chance that a bit of intake or head gasket is loged in the block, restricting the water flow?

    like i said, stupid question, but it is a possibility.
    I KNOW WHERE YOU LIVE,AND SO DOES CHUCK!
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    draggin bumpers unity_neil's Avatar
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    even more basic, is the fan blowing the right way? easy to get wrong (from experience) and if wrong will blow air through rad (assuming it is engine side of rad) forward against the air flow when driving.
    I did this and the temp shot up, reversed and all was fine again.
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    I'm a grown up member now ! 50dodge's Avatar
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    thanks for all your comments, but i think ive sussed the problem.
    the top hose has a "galvanised" spiral to stop the hose collapsing, when i pulled the hose off it felt like it had a lot of give, when i looked inside about half of the spiral had corroded into half coil sized pieces and bunched up in the hose causing a restriction........
    ive changed out the hose and flushed the rad to make sure the was no debris inside........
    engine nows runs at a less worrying 190 degrees

    again many thanks to you all
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    Official RnS Addict beach57's Avatar
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    Also engine's run hotter with antifreeze in them
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  12. #10
    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by paul67 View Post
    Also engine's run hotter with antifreeze in them
    Incorrect , sorry They run cooler with up to 50% mix of antifreeze if you put MORE in then they start to get hot again ( 15 years in the radiator trade and 38 messing with motors).

    Antifeeze also prevents corrosion and keeps debris in the system moving , running without allows the crud to collect in the rad causing it to block and the start overheating.
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