I have already serached and found nothing that I needed to Know, anyway when installing 450cc the bottom seal of the injector can I use my stock one and dremeil that one or I need different ones? Thanks for your help!!!

 

You can dremmel your or buy a set from Zdyne.com for $75.00

 

or you can just put some vaseline on the bottom 'seals' and the injectors where the slide in, put them in place, tighten the rail down, and forget about it. Your not inserting them into steel... it's rubber... it gives.