heating issue

[Jjay78]

ok guys this one kinda got me, i swaped from a 350 to a 454 ran all my cooling lines the same way as with my old 350 was, but now after about a mile it's in the red on the dash guage... it's got a 4 core copper brass radiator, new water pump new thermostat new coolent lines and all fresh coolent... ideas??

[BIG DOG]

head gaskets     

[4x4fun]

 my suggestion is put a real temp gage in it, i know there are differant resistance temp sensors.. i had almost the same issue goin from 84 454 to a 78 400..
Unless it really is getting hot, thats somthing differant...

[Captn. J]

thermo stuck?

[dogred]

timing? fan? fan shroud? fan distance from radiator?

[ToughBowtieTruck]

What kind of gauge? Did you use the same sending unit? I ask this to make sure the 454 doesn't have a warning light sender in it instead of a gauge sender to be sure.

[gator82]

Pull the thermostat and heat it up in water to make sure it is opening and closing at the proper temp. I have bought brand new thermostats before and had them bad right out of the box.

[BigFrank]

my suggestion is put a real temp gage in it, i know there are differant resistance temp sensors.. i had almost the same issue goin from 84 454 to a 78 400..
Unless it really is getting hot, thats somthing differant...

What kind of gauge? Did you use the same sending unit? I ask this to make sure the 454 doesn't have a warning light sender in it instead of a gauge sender to be sure.

[Jjay78]

head gaskets    

just put the motor together, no internal or external leaks with oil or coolent

[Jjay78]

was supposed to be the same sensor as the old one, but i don't have the old one to verify...

[Eroq]

head gaskets     

just put the motor together, no internal or external leaks with oil or coolent

There are different headgaskets, or they were put on backwards,,, not letting coolant pass through to cool.....

[Jjay78]

their for that motor, and put on right

[BigFrank]

any chance ya have a bad water pump???  or possibly the wrong one like for serpentine belt that turn opposite than v belt  seems simple but ive done it before

[Chevy Racer]

any chance ya have a bad water pump???  or possibly the wrong one like for serpentine belt that turn opposite than v belt  seems simple but ive done it before

Motor did have a serp set up on it.  Could be the issue??

[Jjay78]

any chance ya have a bad water pump???  or possibly the wrong one like for serpentine belt that turn opposite than v belt  seems simple but ive done it before

Motor did have a serp set up on it.  Could be the issue??

bought a new pump for a 78 454 already.. that's the one that's on it

[TopFist]

Heat up only when driving or whenever its running?

[Jjay78]

whenever it's running but the heat inside the cab doesn't feel unusually hot, and it don't really act funny...

[BigFrank]

Pull the thermostat and heat it up in water to make sure it is opening and closing at the proper temp. I have bought brand new thermostats before and had them bad right out of the box.

and water pumps  you said a 4 core radiator is it plugged up  even a little bit og corosion on the ends of the tubes ya can see threw the filler  could be plugged up or at the least restricting the flow ???other than that i dunno

[old school truck dude]

any chance ya have a bad water pump???  or possibly the wrong one like for serpentine belt that turn opposite than v belt  seems simple but ive done it before

Motor did have a serp set up on it.  Could be the issue??

bought a new pump for a 78 454 already.. that's the one that's on it

Look at it real close and make real sure the pump is turning in the right direction. Use the the temp sending unit for THAT TRUCK and use brass fittings to adapt it to the new motor if necessary.