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390 engine |
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1041 |
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Posted: Oct/15/2017 at 10:52am |
Is there a difference in specifications from the 68 and 69 390 engines?
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Have2SC's
AMC Addicted Joined: Nov/30/2011 Location: Norwalk, OH Status: Offline Points: 1257 |
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Nope
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1971 SC360 Hornet 4 speed 1970 Javelin 390 4 speed "Base Model" 1967 Rambler 220 X code 343 4 speed
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6PakBee
Supporter of TheAMCForum Charter Member Joined: Jul/01/2007 Location: North Dakota Status: Offline Points: 5457 |
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With regards to what parameter(s), specifically? |
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Roger Gazur
1969 'B' Scheme SC/Rambler 1970 RWB 4-spd Machine 1970 Sonic Silver auto AMX All project cars. Forum Cockroach |
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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One is newer than the other one by a year. and painted a different color.
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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68 and 69 are virtually the same, 1970 is a one year only model with different pistons and rods. It's basically a 401 destroked to 390. Marketing call -- I suspect last year of AMX two seater so they wanted to keep the 390 due to reputation, but were ready to produce the 401. "New" 401 came out with new body style Javelin/AMX...
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Frank Swygert
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Agreed. Though a less honest company could have kept calling it a 390 (like Chevy did with the 396/402) Do you think the reason for the bigger engines was to be ready for the new emissions standards and compression ratio drop after 1970/e71. I guess it could have been the trend towards bigger/heavier cars of the 1970's too. If the 304/360s seem choked off after 71, and worse so after catalytic converters in 76, imagine how they would have been without the extra torque from those longer stroke cranks. Edit, Just had a thought, Is it possible developing the new "401" camshaft is what delayed the arrival of the 401? Did late 70' 390's get the "401 cam"? (I forget now)
Edited by jpnjim - Oct/16/2017 at 6:55am |
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1041 |
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Thanks all for the input. Here is the reason for asking,
I am a 70 guy so I have a 70 TSM and have access to a 69 TSM for reference. I just brought home a 390 complete motor, it supposedly came out of a 68 AMX, has everything on it except carb and air cleaner. Anyway bought it from guy from the Local AMC club that I have known for over 30 years, it has been under his work bench with the auto tranny still attached, I did not get that piece. It was a running motor when pulled, the only thing is that it is painted a orangeish red color, whick might be it has been rebuilt once before. Who knows, anyway I am going to start tearing down for inspection so I need the bore spec's to see where I am at, so would the 69 TSM work or do I need to get a 68 TSM book? Sorry for the long winded story but that is it in a nutshell. Hope I didn't pay to much for it at $800 Any thoughts? Thanks Rod |
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mmaher94087
AMC Addicted Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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I used the '69 TSM to restore my '68 AMX. Other than cosmetics, everything was the same as far as I know.
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Mike
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70amxvegas
AMC Addicted Joined: Apr/26/2009 Location: Lost Wages Status: Offline Points: 1793 |
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I will give you $801.00
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
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68 TSM is fine. I would check the block casting number to make sure it's a 68/69 390 though. It's old, PO may have forgot what it came from or it may have been changed before he got it. I'm assuming the side of the block has 390 cast in?
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Frank Swygert
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