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Unread 04-10-2010, 08:51 PM   #1
1JoeK
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1975 CJ5 
 
Join Date: Oct 2009
Location: Snohomish
Posts: 11
amc 360 has different sized header bolts!

Are all amc 360's like mine or did my long block come with oiddball heads? I began installing the headers on my 360 with stage 8 locking bolts. I mnatched up the size from one of the bolts wich is 3/8 's and ordered the header bolt kit from summit. I now realize that the middle two bolts on each head are the only 3/8 bolts. The other four on each head are 5/16! I still think this is kind of odd especially when the header bolt kit from summit has all 3/8 bolts. Anyone else come across this? I'm having trouble finding locking bolts in 5/16.

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Unread 04-10-2010, 09:22 PM   #2
timmayham
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1995 ZJ 
 
Join Date: Oct 2009
Location: Clarksville, TN
Posts: 352
yep, mine are the same way. The engine came out of a 1985 grand Wagoneer. As for the bolts I had the old ones still and reused them. Your motor isn't a freak... unless both of our 360's are weirdos...
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Unread 04-11-2010, 07:13 AM   #3
Andy5150
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2003 TJ Wrangler 
 
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Location: Palm Harbor, Fl.
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My 360 was from an 81" J-20; its normal; all AMC 360,s are wierdos.
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Unread 04-11-2010, 08:50 PM   #4
yz360
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1974 CJ5 
 
Join Date: Nov 2009
Location: wny
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my 360 is a weirdo the inside ones are 3/8 and all the out side are 5/16 it was odd took us a few mins to figure it out lol mine is a reman 5.9l long block
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Unread 07-04-2013, 07:01 PM   #5
WNC-84CJ7
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1984 CJ7 
 
Join Date: Aug 2011
Location: 35*3'15"N 83*12'8"W
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I guess they were loose. I am missing all but two of my header bolts on each side! I think they fell out within the last day or so. What do I get to replace them? AMC 360.
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Unread 07-04-2013, 09:03 PM   #6
fuzz401
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I think the later 360 heads were that way 80's some were when they changed all my heads I have are from the 70's and they are all 3/8
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Unread 07-04-2013, 09:31 PM   #7
WNC-84CJ7
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Thanks Fuzz. I am getting the impression I can't just go to Lowes and pick up some bolts.
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