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Tim H · 06-30-2014, 10:39 PM

Looking for opinions on the best type of sealant to use on ARP cyl. head studs. Fresh BBC and only minutes after initial fire up some of the lower head studs started to leak. After checking the torque of 80 ft lbs and re-torquing the leakers to 85 ft lbs, we restarted the engine only to discover that many more were now leaking including the ones that had just been torqued.I had used ARP thread sealant and run a tap through all the holes prior to assembly. The studs are new, head gaskets are Fel-Pro 1017-1 on a GM 454 block, using GM "990" cast iron heads. Engine is now back out of car and on the stand.
Never had this problem on my old 468 using same stuff ?

06-30-2014, 10:39 PM	#1
Tim H VIP Member Join Date: Jan 2007 Posts: 1,043 Likes: 1,081 Liked 482 Times in 159 Posts	Head studs leaking coolant Looking for opinions on the best type of sealant to use on ARP cyl. head studs. Fresh BBC and only minutes after initial fire up some of the lower head studs started to leak. After checking the torque of 80 ft lbs and re-torquing the leakers to 85 ft lbs, we restarted the engine only to discover that many more were now leaking including the ones that had just been torqued.I had used ARP thread sealant and run a tap through all the holes prior to assembly. The studs are new, head gaskets are Fel-Pro 1017-1 on a GM 454 block, using GM "990" cast iron heads. Engine is now back out of car and on the stand. Never had this problem on my old 468 using same stuff ?