so i have a 1988 4-wheel drive blazer that i ripped the 4.3 out of and have finaly got the engine bolted in. it was not fun by myself but its now in haha. now i need to figure out what to do about my radiator? can i run it off the stock 4.3 one? is there anything else im going to have problems with? im so glad i found this site guys hope for some input

 

Hey sounds like a fun swap. As far as your radiator, I doubt it would be able to adequately cool your 400. I'd suggest an aftermarket radiator. I'm not sure who would be best to go with, but I know griffin radiators are very popular and known to work well.