Yes a 720, hence the reason I suggested drilling. I just have pulling the head bolts as my reason for not pulling the head on any engine. On a 787, I'd rather pull the engine, drill, realign and do exhaust work then get that deep into a customer's cylinders if I don't have to.He's working with a 720 SPX it appears, so easy to stick a drill down on the engine perpendicular to drill that. On a 787, based on my 2 skis, where that sensor is on the back rear corner, are you getting a drill in there at a 45 degree angle against the hull?
If it were a 96'- 97' 787 GSX hull, or a 96' XP or a 97'-99' SPX, I'd say no way you're drilling that on the ski.
I will be sure to oil my head bolts as a screw them in so I don’t get a false torque reading.