Overheating on run stand

1MeanA said
Can you verify the temp is accurate?

Thanks, yes, both gauge and temp gun are similar

George Jets said
Want to get 4 full gallons of coolant into the block, heads and radiator.

If less than that you have an air lock.

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Thanks Casey, using water not coolant just in case of leaks etc(mess) I filled up thru the hose that I'm using to "jump" the fittings that feed heater core.

cudascott said
Steve a lean condition will cause it to over heat have you checked the air to fuel ratio or looked at the plugs? Not sure how much heat a lean condition would make but I’m sure it’s gonna run hotter

Thanks, I haven't checked plugs, BUT it is the same Eddy carb that was on 273. 1405 or 6

George Jets said
Helps to get the air out of the block and heads with the 1/8" hole drilled in the thermostat.

View attachment 1716251164

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Thanks again Casey, I drilled a hole. I also verified in pot of water that it's functioning properly.