well i am going to jump into the hp race today, am going to get a eldebrock intake for my 500 caddy and also while i am that far going to take the heads off and get the bad exhaust manifold bolts fixed.
the original head gaskets were a thin style.
how far could i mill these heads to first make up for the thicker gasket my investigation was 20 thou , how much more can one mill heads till one has possible valve interferance. the pistions not flattoped as have the figure 8 dish in them. factory std lift cam in this thing.
i am assuming one can mill the heads 60 thou without clearnance problems but want to make shure befor i take them to the machine shop and get into trouble.
what would the std rule of thumb for comp increase for milling heads on a big block style motor ie 20 thou = 1/2 comp ratio ?