Halfrauds Block repairer or a product called Wondaweld, does far more than a temporary job if you follow instructions carefully, Ive run motors for 2 years plus and sold them running fine with no further probs, got a V12 Jag from a ropey six cylinders back onto twelve and a 280ZX from 4 cylinders back to six no problem
Bars leaks will fix radiators but wouldnt use on head gaskets
Cheers Steve