ive never really seen tight guides though i ream them when i port them... out of the box they ream them from the port side up towards the valve top and sometimes there is a burr turned up above the guide which will restrict oil from getting in to lubricate teh valve/guide,,, ive told brandon about it and i believe he has fixed it with recent "batches" of heads

their retainers are std 7 degree retainers as used in the industry,, no problem there,, the locks are a hardened stamped 7 degree lock,, in most applications there wouldnt be an issue with a flat hyd cam or mild solid flat cams


jeff