Stack, maybe if you talked to Carlos at TPUSA, you could work a deal with them to pay an upfront core charge for a new head, and you could send yours back when you swap out and get the core charge back. Just a thought, because that's how I did it with bonnevilleperformance, Bill let me send my stock cylinders back after I installed the new bored and sleeved ones he sent. It would eliminate a lot of down time.
