AMC 360 head questions

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   I believe they had a core shift problem. I've seen the early blocks both ways. 

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amc67rogue Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Nov/05/2008 Location: Phx. AZ. Status: Offline Points: 1578	Post Options Post Reply Quote amc67rogue Report Post Thanks(1) Quote Reply Posted: Dec/02/2016 at 9:25pm
	I believe they had a core shift problem. I've seen the early blocks both ways.
	Keith Coggins 67Rogue X code

tyrodtom Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6212	Post Options Post Reply Quote tyrodtom Report Post Thanks(1) Quote Reply Posted: Dec/02/2016 at 11:06pm
	When I assembled the engine I now have in my 82 j-10, I took a air gun and blew down the hole in question, you could tell it wasn't a blind hole, the air blew thru it. But I never looked down it with anything. I just used sealant on the bolt as recommended by the TSM, , Chilton, And I think BJ Builds a AMC, that I followed then. That was in 2002 or 03, almost 100,000 miles ago, no leakage yet. I looked down that same bolt hole in the 360 block from a 70 Ambassador today with a small flex prob light I have. The hole isn't complelely open on the bottom, about 1/3 rd of the diameter of the bottom 1/4 -1/2 inch of the hole toward the outside of the block is open. It could be core shift, but with it also being present on the 75 block in my J-10, it isn't necessarily a problem that AMC ever completely solved . Edited by tyrodtom - Dec/02/2016 at 11:09pm
	66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.

mopar440cu Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Mar/29/2016 Location: Florida Status: Offline Points: 261	Post Options Post Reply Quote mopar440cu Report Post Thanks(0) Quote Reply Posted: Dec/03/2016 at 5:28am
	Thanks for all the responses!! So, from what yall are saying there is no open holes in the right side passenger side head that might go into a water jacket, correct?
	This is America. What you believe is not the problem... What you believe I SHOULD BELIEVE is the problem!

tyrodtom Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Sep/14/2007 Location: Virginia Status: Offline Points: 6212	Post Options Post Reply Quote tyrodtom Report Post Thanks(0) Quote Reply Posted: Dec/03/2016 at 9:04am
	The only hole in question is the lowest row of bolt holes, 2nd from the front, left ( driver's ) side . All the rest, I think we all agree, are blind, closed, holes. But during any engine assembly you should always check, who can guess what might have happened in the past to a 30 + year old engine.
	66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.

69 ambassador 390 Members Profile Send Private Message Find Members Posts Add to Buddy List Supporter of TheAMCForum Joined: Nov/22/2009 Location: Peoria, AZ Status: Offline Points: 3539	Post Options Post Reply Quote 69 ambassador 390 Report Post Thanks(0) Quote Reply Posted: Dec/03/2016 at 10:27am
	Crud at the bottom of the hole or too much lube during assembly can pop the bottom out of that hole also. I check them every time and after a hundred or so, I've never seen one broke through. The problem does exist but it's extremely rare. Still gotta check it. I would prefer not to use sealer if not needed because it greatly effects torque.
	Steve Brown Algonac, Mi. 69 Ambassador sst 390 84 Grand Wagoneer 69 Cougar XR7 65 Fairlaine 500XL 79 F-350 Super Camper Special

Boris Badanov Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209	Post Options Post Reply Quote Boris Badanov Report Post Thanks(0) Quote Reply Posted: Dec/03/2016 at 2:48pm
	Thicker head gasket will tend to be counter productive. Tighter the quench is the less the tendency to detonate. Sir Harry Ricardo discovered this phenomenon over 100 years ago and it still holds true today. As to heads AMC cracking (with proper procedure). AMC 291C heads tend to lack a machining radius at the front and rear bolt holes under the exhaust ports. I have cracked them and others have had this problem. This can be (carefully) re-machined to add a .06 radius. But putting money into old iron heads is questionable as Aluminum heads are so CHEAP these days. I have never had a leak around a head bolt hole.
	Gremlin Dreams