Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

Update on citric acid flush for the 440 Jensen. Coolant is very clean and machine still runs very cool. Too cool@! 160 T stat when driving is running too cool at like 1/4 gauge.

Anyway, here is another deal I am trying>
Got a big rad off a low mileage 76 Valiant. Looked great, but seriously calcified / mineralized tubes:
I layed the rad on its face so the water ports face up. I mixed 1/2 lb of citric acid in hot water and poured it in there. Then topped it off with tap water and am letting it sit for about 24 hours. Them balls you see in the rad are moth balls I put in for storage. They floated out when I put the solution in.