I just received a spare set of throttle bodies in the mail today. I am going to send them to maxbore.com Monday to be overbored, have the throttle shafts thinned and then filled with larger butterflies. I will be then port matching the boots to the throttle bodies and intake ports on the heads to the boots. Here's what we are starting with, I'll post up the new dimensions in a week or two when I get them back. I'm hopping for at least 42mm (as the entrances are already 40mm) but really anything