If you going aftermarket cylinder why not start with a serval. You could always port it into a cub if you wanted to later. As far as cranks if you go 4 mil look at vitos as they have keyed webs to prevent twisting out of phase. I know i payed way more to phase pin and rebuild a stocker than it wouldve cost for a vito. Lastly that girdle head is a waste of money. Run the cut stocker from justwannarace