I'd recommend "anerobic sealant" (thread locker) on the machined metal to metal surface between cam caps. Silicone is "too thick" to work effectively in that space in my opinoin and in the FSM too, although it isn't real obvious in the manual and easily overlooked,,it is there.

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.