Originally Posted by Smokin Gator
If you cut the holes with a step bit to 13/16 and clean up the cut with a rat tail file the 1/2 inch pipe nipples should thread right in.
Got my new drum yesterday ... so I'm going to begin assembling my UDS this weekend - and will admit - I'm a little confused on the whole pipe nipple thing for the air intakes! Why do you drill a 13/16 hole for a 1/2 inch pipe nipple? What am I missing and do you have any close up pics?
Thanks for the help!