RedNeckTexan

Hey y'all first time posting. Y'all are an absolute array of knowledge I thank y'all for all y'alls comments. So I purchased this truck about a year ago and it started having a lower intake manifold leak I ignored it for a while just made sure it had plenty of coolant. I finally changed it the other day and I went to start it and I was a loud knock. After cranking it a couple times did not seem to not be there. Also after trying to start it about five times it would fire but not run. I have not tried to start it again because of the knock. There was a lot of calcium buildup that look like from water instead of coolant being used. I would like to hear your opinion on what you think the knock is I was so careful to not drop anything I do not think it is that. Thank you for all your comments. Zachary K.