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Old 05-17-2017, 09:21 AM   #1
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A series of dumb questions for a 360 swap

Hi Guys,
I'm totally new to mopar and am in the middle of swapping a dead 360 out of a 1979 higtop van for what appears to be a 1980 360 I found in the classified (the block number starts with a 0W360).


The physical swap is done and was fairly sketchy at times owing to space clearances, but the engine is now bolted in.


The new engine has a Carter Thermoquad that may or may not need rebuilding - previous owner said it might be seized, but I am not convinced, and I have two of the smaller carbs from the 1979 - don't know what they are. the new engine also has a vacuum booster that the old one didn't have or had had deleted.


My first question is, the new engine has black 1/2 inch tube that connects the just below the two valve covers (rear) routes over the top on the drivers side and was once connected to a rubber hose... Can someone tell me what this is?


Once I get the plumbing and electrical connected, I am sure I will be back with a series of carb questions.


My skill level is at the youtube mechanic level, I've rebuild land cruiser carbs, changed clutches and rebuilt an old british sports car motor, but this is the newest (and biggest) thing that I've worked on...


Thanks!
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Old 05-17-2017, 04:48 PM   #2
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I believe the tubing is this system.

http://www.autozone.com/repairguides...00c152800529e3
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Old 05-17-2017, 05:57 PM   #3
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Coronet 500 is spot on...... That is the Air Injection pipe.... It runs from the air pump diverter valve back too the the back of the Exhaust Manifolds..
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Old 05-18-2017, 06:51 AM   #4
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Helpful, thanks! I've looked up now what the diverter valve looks like, I will see if there is a connection point on the '79 for this '80 part. Here is a pic of the air injection pipe... excuse how ugly the engine is - goal here is to get it running...
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Old 05-19-2017, 04:54 AM   #5
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I don't know what exhaust emission regulations and testing is where you live but if you remove this system and plug the holes in the ports with other updates you can improve fuel mileage and performance.

I have passed ours with 2 bbl carb, new exhaust cats and retarded timing, all installed just for testing.

Block casting numbers just above starter.

71-74, 3418496.

75, 3870230.

76-86, 4006830.

87-92, 4315830.

Last edited by Coronet 500; 05-19-2017 at 05:18 AM.
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Old 05-19-2017, 06:57 AM   #6
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Thanks Coronet,

I won't be able to get back to the van until next week, pretty sure its a 1980 based on the other stamp, but will check the actual casting next week.

Re emissions, because of its age and the fact that it was previously registered in Alberta, I just need an insurance inspection. $50 and one of my last three was done by a guy who didn't get out of his car... so they are usually easy.

Does anyone have a link though to a good vacuum pathway chart? The ones I have found so far on google are all pretty different - probably owing to different required in different jurisdictions at time of manufacture.

I was going to grab a Haynes manual at some point - maybe that will help,

Cheers!
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Old 05-19-2017, 10:02 AM   #7
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Just use your original ex manifolds.. the manifolds should cover the injection holes in the heads..
Difference was cars had the system, trucks/vans did not have the air injection system

Last edited by TVLynn; 05-19-2017 at 10:07 AM.
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