Thermostat Housing Bolt Torque

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   Anyone know the torque spec for the thermostat neck mounting bolts for a 343 (assuming 360 is the same)? My 1967 TSM is in a box in storage, so I can't reference it. I have 24 ft-lbs in my head, but that could be too much.

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67 Marlin Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Feb/21/2015 Location: Minnesota Status: Offline Points: 877	Post Options Post Reply Quote 67 Marlin Report Post Thanks(0) Quote Reply Topic: Thermostat Housing Bolt Torque Posted: Oct/14/2021 at 9:23am
	Anyone know the torque spec for the thermostat neck mounting bolts for a 343 (assuming 360 is the same)? My 1967 TSM is in a box in storage, so I can't reference it. I have 24 ft-lbs in my head, but that could be too much.

Hogman Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Jan/02/2018 Location: Sarnia Ontario Status: Offline Points: 372	Post Options Post Reply Quote Hogman Report Post Thanks(0) Quote Reply Posted: Oct/14/2021 at 11:34am
	I WON'T say with 100 % Accuracy, but a Couple of Months back, I did one on a Cast Int., & went with, 12 or Maybe 13 Feet.... NO Problems, or Leaks at all. HOPE it helps. ME
	Hogman

PHAT69AMX Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5918	Post Options Post Reply Quote PHAT69AMX Report Post Thanks(0) Quote Reply Posted: Oct/14/2021 at 1:23pm
	67 Marlin - 10 - 15 pound feet it says in the 1969 TSM. Opinion, first fill coolant system with only strait plane distilled water and heat cycle the engine a couple few times first to ensure or at least increase the chances of a leak free seal. Only after doing that, then drain some water and add the "mouse oil" nasty glycol anti-freeze... This also helps a new water pump shaft seal to "seat-in" imho. And in the event that there is a leak, much more pleasant to deal with if only plain water in the system. Peace
	Link to a Short YouTube Burnout Video

67 Marlin Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Feb/21/2015 Location: Minnesota Status: Offline Points: 877	Post Options Post Reply Quote 67 Marlin Report Post Thanks(0) Quote Reply Posted: Oct/14/2021 at 2:27pm
	Thank you gents. PHAT, that technique is great info and reaffirming; just what I did when swapping the intake. That sealed up, and so did the thermostat housing. Of course a hundred miles later, the thermostat starts sticking, and I deleted the picture I took of my TSM when I torqued it in the first place. I knew I should have bought that Robert Shaw unit to go along with a new intake. Oh well, now I've got one, and I'd rather replace the thermostat 10 times instead of the intake, so I'll consider it a good deal. Edited by 67 Marlin - Oct/14/2021 at 3:04pm