Considering a doing a half bridge, can this be done on large street ported irons?
 

Mo mortor already has a large SP, can I just add a bridge to the secondary ports? If so is there any thing I need to know?

Do they already open earlier than stock? Was the port opening timing altered? If so, you're probably out of luck.

I have a nice matched set of stock port irons for sale right now. :-D

Yes I beleive they are early opening