I have a 50 GMC 100 with a 228. I just recently replaced the head gasket and had the head checked out by the machine shop, all tested good. I ran it several times to get the engine up to operating temp and all went well. Total run time was around three hours. The next time I took it out for a spin I noticed a oil/coolant gray colored leaking from what look like the bottom of the fuel pump. Engine was still running fine. Engine did not over heat. I drained the oil pan and there was approx. 3 gallons of coolant in the oil. Any clues on where I should start looking for this leak?

Last edited by Peggy M; 01/16/2024 5:35 PM. Reason: added more info to the title