QUOTE(jcd914 @ Feb 14 2018, 01:45 PM)
Easiest way is just to leave them in (or reinstall) and cap them.
You can plug the holes but it requires 10x1.0 bolts that are just the right length.
Jim
I do not agree with leaving them in and capping them.
When the smog antlers are not there holding the tubes they can back off. Had this happen more than once. The long tube on a shaking engine will loosen the threads. remove them and plug them. I think a 1/8 NPT tap works. Use red Loctite. Stock is a 10mm fine thread. Had a friend who blew out a tube and walked to the Home Depot to get a bolt to plug it.
Bruce