My oil burning pig. Pics too!

Not reversion unless the rings are shot. If the seals were installed without the plastic guide in place over the valve stem they should be replaced again - and this time use it. Just the process of sliding the valve through can damage the seals like 9s said earlier. Cracks from porting rarely - very rarely have any oil ssociated with them unless it's the port roof. Most everywhere else there are water jackets. You'd be leaking water, not oil. It's a guide problem unles the rings are not working but the leakdown is "ok". 3% to me is a lot for gapless, but that doesn't mean it's pumping oil up there. Pull the heads, have a good performance shop look at them.