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Unread 12-23-2012, 08:27 AM   #1
1978levisj10
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1978 J10 with a 343

I just purchased a 78 J10 Levis edition. decoded the vin and it should be a 401. crawled under the truck and checked casting on the block and found it to say 343. further research on the 343 it was not a production motor offered after 1969 so I could possibly have a 290hp V8 in this vs the 215 hp 410. Is this a good score.

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Unread 12-24-2012, 07:05 PM   #2
cruiser54
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1976 was the last year for the 401 in the Jeeps. How did you come up with a 401 for a 1978?
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Unread 12-24-2012, 07:46 PM   #3
1978levisj10
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7th digit in the 78 vin is a z which makes it a 401. But it has a 1968 amc 343 4v engine
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Unread 12-24-2012, 08:10 PM   #4
1978levisj10
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Vin J8A25NZ

J= Jeep
8= 1978
A= Toledo Ohio Lhd auto
25= J10 truck 119 wheel base
N= GVW 6200
Z= V8 401 4v
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Unread 12-25-2012, 12:25 PM   #5
rjbruzan
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343 is a good motor. The 401 is also. Iill bet the 343 is alot easier on fuel.
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Unread 12-25-2012, 02:51 PM   #6
1978levisj10
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Not sure about that had to trailer it home. Replacing the battery cables plus and wires to see if it will run. It turns over
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Unread 12-31-2012, 05:12 PM   #7
1978levisj10
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Well replaced the battery cables, plugs, wires, cap, rotor, coil, fuel filter and and fuel pump to and electric now need to purge the gas tank and add fresh fuel
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Unread 12-31-2012, 05:14 PM   #8
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Well replaced the battery cables, plugs, wires, cap, rotor, coil, fuel filter and and fuel pump to and electric now need to purge the gas tank and add fresh fuel

and then?
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Unread 12-31-2012, 05:25 PM   #9
1978levisj10
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Draining the tank in the morning then the fresh gas. It turns over and fires but won't catch yet
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Unread 12-31-2012, 05:26 PM   #10
1978levisj10
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Turns over fine just need to get fresh gas backfiring like a champ with the old gas
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Unread 01-01-2013, 02:04 PM   #11
1978levisj10
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Well fresh gas and still backfires but not running at a lost. Will run a compression test next weekend
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Unread 01-04-2013, 09:52 PM   #12
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Determined tonight that the timing is way out due to distributor not at the right angle. All the pics I have seen show the vacuum advance pointing towards power steering pump and the one on this truck is straight towards the radiator.
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Unread 01-05-2013, 10:48 AM   #13
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Quote:
Originally Posted by 1978levisj10 View Post
Determined tonight that the timing is way out due to distributor not at the right angle. All the pics I have seen show the vacuum advance pointing towards power steering pump and the one on this truck is straight towards the radiator.
Better check the distributor drive gear while you have it out
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Unread 01-11-2013, 09:57 AM   #14
1978levisj10
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Can anyone check the wiring to their coil on their v8 need to check to see if I have the right wires hooked to the positive side of the ignition coil
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Unread 01-12-2013, 10:11 AM   #15
1978levisj10
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Please will someone check there ignition coil hook up on their fsj v8 and help me out with the color of the wires to the coil
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