Can you run 6.5L heads on a 6.2L? Will the 6.2 exhaust manifold bolt up to the 6.5L head? Do they really breath better than the 6.2L heads? I am replacing my head gaskets so already have my heads off and found a couple for 80 bucks, would it be worth it? Thanks. 1982 6.2L Diesel K5 Blazer, TH700, 31 inch tires. Fire ALWAYS makes it better.