Boars Head Rock is an obvious rock formation west of Katoomba, clearly visible from Narrow Neck. An exciting abseil trip goes down a series of gullies and ledges below the rock. The route is quite exposed, so best for experienced abseilers. However, it can be rigged with safety lines, so can be suitable for beginners comfortable with some exposure, led by experienced leaders. Unfortunately the gullies in the area tend to channel the breeze. Being mostly south facing, it can be very cold and windy.
Park at a pull in area on the SE corner of Cliff Dr, 100m south of Cahills Lookout (signposted). Walk down a well-constructed track, signposted "Climbers Only" for 150m to the end. Boars Head Rock is the obvious rock formation to the west across a narrow gully. Look for a set of chains on the slope towards the gully. This is the start of the abseil route.
The first drop is 23m into the rainforest gully below. The gully drops away to the right, facing in, so keep left if your rope is short.
Scramble south down the gully and then around on ledges to the right. This leads to the exposed traverse through the bottomless slot of Green Salad Gully, the most spectacular part of the trip.
There are 2 ring bolts near the start of the ledges if you want to set a safety line here. Near the start of the slot there is another ring bolt, followed by a carrot and two ring bolts in the slot, and another carrot at the anchor at the far end of the slot. So take at least that many spare carabiners (bolt plates optional if you want extra protection) to rig up a safety line here. From the bolt near the slot, you need about 17m of rope to protect the traverse, more if you want to protect all the way back to the first two bolts.
From the end of the traverse, there are chains for a 15m abseil down the narrow slot on to a small ledge.
There are more chains here for a 25m drop back underneath the slot down into a dry gully. There are a lot of loose rocks on this abseil. The first abseilers are advised to take cover underneath the overhang at the bottom. This applies particularly to the rope pull down.
From the bottom of the gully it is a 27m abseil to the ground, though if your rope is short, it is possible to scramble off from about 5m up. Be careful on this abseil as it is very easy to dislodge rocks from the gully.
Head around on a track to the right. You may want to rig another safety line as the path heads down on to a narrow ledge which drops away 30m to your left through small shrubs.
The next abseil is from bolts and a sling on the cliff above the next point. This is a 35m drop, with a good proportion overhung, to the ledge below. The landing is a little tricky as it slopes out. It is a further 10-15m to the next level, if your ropes reach. Either way there is a fair bit of friction on the pulldown.
If you don't do the full drop, head off to the right facing out, and scramble or abseil (15m) down a gully where there is a tape around a tree.
Another option for the last abseil would be to traverse around another 40m from the point to a big gum tree with slings on. However, I don't know how long the drop is - I imagine around 30m, but two ropes would be advised just in case. This comes down just past the gully mentioned above.
Follow the track back to the left to where it meets the Devils Hole track, and then head directly up the gully through the Devils Hole and back to the road.