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my truck is getting hot there is no thermostat when i take off the radiator cap the water is moveing and then it starts too foam up the motor is hot too the touch after maybe 10 min of running its the g180 73 help

Let's see:
No thermostat (which is not located under the radiator cap) means the water will flow continuously lowering the temperature slightly and yes the water will foam slightly with the radiator cap off. The radiator cap should be good to around 15 psi which raises the boiling point of the water.
After running for 10 minutes, the engine WILL be hot to the touch.
What it really needed to check what temperature the engine is at would be something other than an idiot light and/or use a laser thermometer on the engine. You should be loking at approximately 180 degrees. I'd go with a good guage!!

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I've never been wrong! Once I thought I was, but I was mistaken.
Rick
Loranger, La
1980 Stepside LUV (Again)

it is getting hot enough too push water out of the radiator cap i thought the radiator might need too be boiled out im running 50/50 coolent the guage on the dash pegs out too the hot mark the motor runs the same at that temp head gasket will push bubbles through the radiator right

That is true about the head gasket. Check the oil to see if there is any water in it by having a whitish appearance. Also bring each piston to top dead center, attach an air fitting to that particular spark plug hole and using about 15 psi or so, you can listen for any leaks into the radiator. Of course the truck should be running rough and some smoke commimg out of the exhaust if the head gasket is blown. Anyone else with some quick ideas?

_________________
I've never been wrong! Once I thought I was, but I was mistaken.
Rick
Loranger, La
1980 Stepside LUV (Again)

Without a thermostat to restrict the flow,the water may be running through the radiator too fast and not getting properly cooled.

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"You can't please everyone,so you've got to please yourself"

the oil is fine not milky or any tinge i had the carb rebuilt and too get the truck too run the mixture screw is all the way closed no mater if you back it out it wont change the tone of the motor it smells realy lean can that have something too do with it and no there is no smoke out of the tail pipe

Yes, too lean can make it run hot also.

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OK, I'm over it. Where's the beer?

Rondog is right. Running too lean will make her run hot. What might have to be done is to try rejetting the crab with larger jets or just rebuild the entire carb. Not getting any response/changes from the engine when adjusting the mixture means something is amiss. If you have another carb to try on it, I'd try it. I used to have an extra one when I drove a LUV around Las Vegas due to the problem of having the floats stick after about two months of driving in the summer heat. I would just swap carbs, and clean the one I pulled off and store it for next time. Used it to help troubleshoot other problems too.

_________________
I've never been wrong! Once I thought I was, but I was mistaken.
Rick
Loranger, La
1980 Stepside LUV (Again)

Forgot one thing, check the timing. If the timing is too far out, it can adversly affect the temp and possibly the carb setting. I don't have a book to check what the setting is, maybe someone here has it handy for you.

_________________
I've never been wrong! Once I thought I was, but I was mistaken.
Rick
Loranger, La
1980 Stepside LUV (Again)

Timing for 73 is 8 degrees BTDC at slow idle (700 rpm or less) with vacuum advance hose disconnected.
Also if the idle speed is more than 700 rpm the mixture screw will have no effect. It is an idle mixture adjustment only.

there is only three lines on the crank pully and a pin sticking out of the block i set the cam and crank up on the middle line of the crank pully what about the muffler if there is no back pressure on the motor will it do the samething make it run hot

Looking down on the marks from above they are: the one on the right is 20 degrees BTDC, the middle one is 10 BTDC, and the left one is 0 BTDC. Ignition timing (8 degrees) is just a bit to the left of the 10 or middle one. Cam timing is set using the 0 mark.

No Thermostat can be a bad thing and sometimes have an adverse affect on temeperature climbing especially in vehicles with high miles. (more friction between berings) A thermostat restricts the water flow allowing the radiator and fan time to cool the coolant running through it. Without a thermostat the coolant might not have enough time in the radiator to cool down. Thermostats are pretty cheap, you might need to try a cooler running one to see if it helps. Ten minutes of running will make any engine to hot to touch...at least any of mine anyway. You said it is pushing coolant out past the radiator cap, you might need a new one to hold the right amount of pressure.

How old is your water pump? Is the circulation strong?

_________________
In life there is the "Way things should be" and then "There's the way they are".

2005 Silverado 3/4T Crew Cab
1981 Luv 2WD
1979 Luv 4x4 Currently going through Open Heart and Cosmetic surgery
1995 Roughneck JetBoat
1981 Luv parts trk

i looked in the radiator and its not a strong flow of water and i seen little rocks in there they look allmost like calcium i think it might be pluged up im going to boil it out friday.im not sure about the water pump i bought the truck in march and then a couple of days of driveing it is when it started geting hot im not used too the 4 bangers its new for me

man i took off the bottom radiator hose a bunch of s.....t came out the radiator doctor has it now keep you guys posted thanx for all the sugestions guys keep it up

good luck and keep us posted.

_________________
In life there is the "Way things should be" and then "There's the way they are".

2005 Silverado 3/4T Crew Cab
1981 Luv 2WD
1979 Luv 4x4 Currently going through Open Heart and Cosmetic surgery
1995 Roughneck JetBoat
1981 Luv parts trk

the radiator is junk need a new one they want 216 too recore it

OUCH! Go with a small aftermarket radiator. Even an aluminum radiator is far cheaper that that. I'm going with one from SpeedWayMotors.com If I remember it is 19" tall by 22" wide. Part number is 917347 and is $110. There will be a bit of modification to the truck of course, but minor. This will even keep a V6 cool so if/when I swap engines out, I'm covered.

_________________
I've never been wrong! Once I thought I was, but I was mistaken.
Rick
Loranger, La
1980 Stepside LUV (Again)

Check with your local auto parts store. LUV radiators are still available. Should be lass than $216.00.

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OK, I'm over it. Where's the beer?

I agree with chevyluv1980. Just find a radiator about the same dimensions with the hose necks close to the same spots and MAKE IT FIT. When my fan went through mine, a free radiator, some flat iron, angle iron and a handful of hardware did the trick for me.

_________________
In life there is the "Way things should be" and then "There's the way they are".

2005 Silverado 3/4T Crew Cab
1981 Luv 2WD
1979 Luv 4x4 Currently going through Open Heart and Cosmetic surgery
1995 Roughneck JetBoat
1981 Luv parts trk