360 Advice Needed - Autocross / Street Engine Build
Sure, I have no affiliation with these guys, but they seem to have the cheapest prices online for K&S brass tubing:
Rd. Brass Tube .014x17/32x36 (3) (k+s9117) K-S Hobby and Craft Metal Tubing
Amazon has single tubes too. I've never done sleeves before, but based on these RPM heads there'll be no meat left.
Will let you know how it goes in a couple weeks! :)