i know venom racing guy knows a heck of alot about this. I know some. It takes alot of add ons to maintain the outer flange angled ends to preserve the pressure drop to make fuel flow better. If you get it done, it is gunna be about $300 i think.
go to yfztech and contact sredrum. he is the man. you will see his vendor thread if you scroll down on the main page.what if i just wanted to bore the inlet side of my carb or maybe a 41mm to 39mm taper[/b]