Sorry to continue carrying the thread further and further but I purchased a really nice set of 670 heads for a nice price today. I got a set that was rebuilt from a guy locally for $250. They were built by a reputable Pontiac machinist that I was planning on using for my block but the seller bought a built 455 with flat top pistons so he could not use these 670s. I really like the idea of using these since they would be numbers correct down to the date code for my new bird. Now that I have decided against the Silvolite pistons and have to purchase new pistons anyway, could I achieve my goals with a dished piston? I would love to use this head and keep the engine "pump" friendly to at least premium fuel. I found that the dished pistons are available at +17cc here:
I am open to additional expense for valves, thicker head gaskets, machining, or other hardware to use these heads for originality. Obviously I still plan on upgrading to the Crower springs to match the cam since stock springs were used for the 670's recent rebuild but should I look at a different cam grind that would decrease cylinder pressure and help reduce detonation? I have read and read but cannot seem to find anybody with personal experience and specifics on their build with the 670 heads.
