Quote: You don't HAVE to run higher compression with the aluminum heads, just you are able to run a bit higher compression without detonating.
You can use the speedpros , you may have to cut valve reliefs in them, have the block cut so the pistons are at zero, have the heads cut to 80cc and you'll be at 10.0 , the flattop piston will be more efficient than the KB400 with a dome.
