does anyone have any ideas what I can put in my radiator to seal up the horse W5 heads I used to run just some regular sealer in it and it worked fine for a couple of years now it has started leaking in the number 5 cylinder after it sets a couple days
Waterglass (sodium silicate) works on cracked cast iron heads and blocks. Can't see why it wouldn't work on aluminum. You have to be careful with how much you use as it will plug a rad up solid. It has that glass nickname for a reason.
https://en.m.wikipedia.org/wiki/Sodium_silicateKevin
