Highest flowing sbm heads?

VolareDon, notice the thread is titled " Best flowing sbm heads ". A person asking such a question is probably not building a very mild 318 that will never be raced. Why would you expect a 302 casting head to even enter the conversation ? Of course the 302 head is fine in certain situations like yours. I can relate to working with a small budget. My own 318 still has stock heads. But it's not really relevant in a thread where the OP is looking for big power.