I have a rebuilt (approx. 15K on rebuild) 460 in my 77 f250. I have sever foaming of the coolant and believe I am getting exhaust in my coolant. Any ideas as to how to determine exactly where this is coming from? Also, how hard is it to pull the heads on this beast while in the truck. That passenger side looks awfully tight to get the exhaust etc out. Any good ideas? I have had to remove the thermostat to make it driveable. The air was getting trapped under the thermostat and the transferability of the air wasn't like water, so the water would get real hot before the thermostat would open.

 

first of all, you need to determine if it's "exhaust". You should be able to smell it when you open your radiator cap, it will smell like... Exhaust. Or burnt oil.
Next, do a compression test. If you find 2 cylinders next to each other that are significantly lower than the rest, that's a pretty good sign of a head gasket leak somewhere between those 2 cylinders. To be sure, and if you have the proper equipment, inject air into your cylinders one at a time. Most auto parts stores will carry an adaptor that plugs into an air line and screws into a plug hole.. air up the cylinder, and look in your radiator to see if there is bubbles.
Worst case, take it to a local mechanic, and he should be able to perform one of the above tests for reasonably cheap, as it only takes a few minutes.

you should be able to pull the heads off while engine is still in the truck. remove intake, remove exhaust manifolds or headers. You dont have to pull the exhausts out of the truck, just off the heads enough to pull the heads off the block.. And then I guess you'll see what you see, eh?
Best of luck to you...

J/.c

1965 Ford Galaxie 500 (okay, so not quite a truck)
ANOTHER 460/C6 @ 365hp/519 lb.ft.
14.36@100.4, 16-18 mpg AHHAAAHAAAHAAA!