Originally posted by Dynamite
would the aac piston/liner connecting rod for collari 3port motor (WRXLC12PRO3) fit into the s12-tup 5port? or is the block any different?
likewise would a piston/liner and rod for the new s12wcr slot into my tup and allow me to race 3port, cause i need a decent 3port for this year that way all i'd have to do is buy the sirio pipe, i'm not worried about having a low cg cooling head.
You have to check if your block has widen upper portion on the exhaust port location. They are like teardrops on the sides of upper portion. Those are made on Sirio Evo2, WCR and Collari's to match wide top portion of sleeve's exhaust port.
If it has that work, than you can drop in the Collari or WCR piston/sleeve 3 port set.
The early Sirio blocks PN S12 111100 didn't have that.
The new Sirio blocks (starting from the Evo2) PN S12 111101 have that work.
AFM