[QUOTE=NitoriousRC;8247663]
The set also arrived today .... was probably in my box before i wrote the previous stuff above. No doubt excellent work done on it.

I have found a button that looks like it fits but its not so clean and also a turbo plug, and it looks like there is also one on ebay.

Martin,
If needed I can reference the size further. Pretty much your base RB X-12, Mugen MT12 headbuttons are interchangable if I remember correctly. You should have a tight-slip fit in the (0.5435") 13.8mm its fitment in sleeve bore.

And for the record, your NovaMega SX12 was one of the more stuburn small block piston+sleeve set resizings. They never seem to hit that "sweetspot" the first attempt, requiring me to "open and close sleeve cylinder" a few times for what I feel is the perfect tapered fit, that results reasonable rebreakin and improved performance'.

Ryan, Call me next month or after the hollidays.

Any questions guys , call, text, email.......or post here on RCTECH. I am servicing orders thru this evenning, LATE.

RayAracing