One particular day I left Phoenix towing that trailer headed for Flagstaff which is 150 miles of "up." Coolant hit what I'm guessing was 300 (280-degree gauge) and it never did a thing. I ran Evans in a Caddy 500 for years towing heavy stuff - probably around 10,000 lbs. Some people run the vent to the top of the water pump, but that requires removing the pump to keep chips out of it. Its possible that just venting similar to an LS engine and running the line to the radiator tank may help. Here is what they do to the 500 Cadillacs. You might try pointing an infrared heat gun at your heads in different places to check for hotter areas, and also compare exhaust header temps. I just say that as an example to demonstrate that the heads are usually where the problem originates and often finding your solution there will correct the problem. The idea was to NOT drill the coolant holes in the mid cylinders, which may allow the coolant to return before it gets to the back.but to make it easier to flow at the back and then return past the mid cylinders. Not sure if air is being trapped or just insufficient coolant, but it works. This allows more flow at the back which subsequently flows forward. One of the solutions they came up with is to drill a couple additional coolant holes in the deck of the block at the rear. There are lots of people who have temp problems on the Cads. Then you also might back the timing off a degree or two and see what the result is. ![]() ![]() Some radiators are modified to be multi-pass which helps. There are lots of people running large engines.some with superchargers and they cool just fine.so it has to be doable. I would see if adding a couple fittings and a temporary purge doesn't alleviate the problem. The heads on an engine are the primary source of heat, and the block usually is not problematic. Many other engines can trap air too but no one really wants to talk about it.everyone assumes its the radiator. LS engines have vents to let trapped air purge. Are you sure you don't have air trapped in the heads.
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