my work truck is a 53 that finally cracked on me i have been expecting it for forever... All i did for now untill i have time to do a motor swap was get some of that block sealer ran it through my coolant witch slowed down the leak alot, then roughed up the all over the crack with a grinder and JB welded the living hell out of it.. held really well for just daily driving but didnt last when i pulled a 10,000 lb load yesterday... but for a temp fix so you can drive it without spitting coolant all over it does work really well just dont pull anything heavy...