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Old 03-12-2021, 12:46 PM   #1
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International 345 / 392 gasser info?

Ran across an older International gasser that is currently not running. I am curious whether these had electronic ignition or breaker points, and if it could be either, when they switched to electronic. It seems to me one of three things have occurred, points have corroded or burned up, bad coil, possibly combined with old gas, and / or maybe some idiot put diesel in it not knowing any better.

I was just curious as to any common issues with these engines, as I've never heard any bad about them and no news is good news AFAIC. But I was curious whether, if it just happens to be a point ignition, if an electronic upgrade is available in this day and age? Anything else I should look out for? Did any of these come with air brakes?

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Old 03-12-2021, 12:58 PM   #2
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take a look over at binder planet in their forums for all things International. I had a 304, I don't think there was anything electronic about it.
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Old 03-12-2021, 01:04 PM   #3
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I've found some aftermarket HEI conversion kits, complete drop-in dizzy with cap and coil for about $450. Doesn't seem like a bad price.
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Old 03-12-2021, 04:55 PM   #4
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I have the 345 in my bus, and had one in my old dumptruck. The 392 WAS in my bus. The 392 is bad news if it is NOT the improved cooling version. The "improved cooling" ones are fine.



The 345 is a durable good engine. Points distributor from the factory. Pertronix makes a replacement module that fits in place of the points in the stock distributor. They work quite well. I did go all out and get the HEI distributor From D.U.I. and love it.


Camshaft is gear driven so no timing chain to worry about. If it has been sitting for a long time without being run pull the distributor and spin the oil pump to get oil flowing. Have the valve covers off when doing this. The oiling for the rocker arms is from the cam, and you will need to turn the engine a bit by hand to get oil to come up to each side. Each side alternates oiling. If you do not do this you may spin a cam bearing...



Parts are generally still available.


Stan's headers has headers made to fit the Loadstar trucks, and will fit the busses just the same. 5mph improvement on hill climbing measured on an 8% grade.


If you want an automatic the MT-40 will fit and is a 6 speed trans with retarder, and lock up torque converter. I have all the parts to make the swap, other then the radiator.
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Old 03-12-2021, 05:05 PM   #5
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The factory electronic ignition was pure crap. Don't ask me how I know. I have 3 SV engines now and I like them.
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Old 03-12-2021, 05:35 PM   #6
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Some of these also had delco distributors and were very nice distributors as far as points go. Set them at 30 degrees dwell and go. I have one in one of my 392's I think 1974 was the year they went to the improved cooling. I have also discovered that you dump the Holly carb and go with an autolite. No more fuel leaks.
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Old 03-12-2021, 05:56 PM   #7
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I went with a 500cfm Holley, and have been happy with it.


Yes I too believe 74 was the year for improved cooling 392's
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Old 03-12-2021, 07:33 PM   #8
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edelbrock 1405 on a 392 is a really nice update.. mine was already a 4 barrell 392 .. the eddie on it was jetted and metered wronf so it was too rich.. rebuilt it and set it up a notch or 2 leaner and she runs like a champ!! edelbrocks are really easy to dial in .. you dont have the governer like you do the holley so you have to watch your revs.. esp on the 392.. most school busses didnt have tachs so you'll want to add one if you ditch the OEM holley carb.



the fan is worthless.. straight blade just makes a lot of noise and spins all; the time. . a 7 blade fan and a clutch fixes that.



ronnie will the DUI dizzy fit the IC 392? mine is a 1978.. i thoiught I read someplace on the 392 there were clearance issues? I hate points.. always have and always will,,



now that the ole girl runs like a champ I can go onto more important things like Air-Conditioning..
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Old 03-12-2021, 07:40 PM   #9
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Had a 345 in an old B-series truck (the engine was cannibalized from a later model bus), ran like a champ but top end was 55-60 and averaged 4-5 MPG empty. Power uphill left much to be desired, but then again, no updates had been done to it either.
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Old 03-12-2021, 07:53 PM   #10
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they arent fast but wow for nostalgia.. I rode a lot of brand new school busses with 345s and 392s. . with AT-540s
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Old 03-12-2021, 08:41 PM   #11
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Yes the dui will fit the 392. Although the thermostat housing will need to be clearanced. Same with the 345. They sent a modified housing with the distributor. Think I got it from Summit.

345's normally have a 2 barrel 350cfm in truck/ bus applications. The 392 often has the 4 barrel.

We average 6mpg on the highway running at 65.
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Old 03-13-2021, 07:26 AM   #12
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apparently the 345 was offered i n both 2 and 4 barrell but the standard was 2 barrell for medium duty.. ive never seen a 392 that was 2..



even with crappy distributor, after I dialed in my edelbrock carb.. (im running it with a slightly leaner approach to the 2 main barrels anbd a bit richer on the secondaries).. i get about your MPG. 5-7. . thats after I regeared the bus to 4.78, still with an AT540 trans that of course likes to run warm.



the DUI should give me better spark.



what plugs and gap are you running?


are you running 0 degrees base timing? im running 2 on mone right now and it seems happy.



-Christopher
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Old 03-13-2021, 09:14 AM   #13
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On my 392 2 bbl Allison in a 2 ton I run 5 degree base timing with stock distributor springs and weights. On the 345 5 speed 2 bbl in my bus I run it at 2.5 degrees. These motors will detonate if allowed to pull down with to much advance. My 345 4bbl automatic 727 1 ton I ran 7.5 degrees. Truck sold. My 1 ton 392 4 bbl 4x4 4 speed I run 7.5 degrees. Watch the egt on these both my bus and my 2 ton would hit 1750 or higher if I ran it to lean. I have been in to lean burn for a long time when I was in CA. I would set as lean as I could get away with at sea level and let it rich up going up hill.
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Old 03-13-2021, 09:19 AM   #14
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Another thing I would do is advance the camshaft 1 tooth to get a little more low end torque. I would reduce the top end, but they didn't like revving up anyway. I first tried it on a 61 pickup I had with a 266 v8 3 speed. Didn't have to slip the clutch on a hill starting out.
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Old 03-13-2021, 02:28 PM   #15
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I am running 12 base timing with dui distributor. They recommend 10 as a start and up it till it knocks then back off 2 degrees.

Champion j12yc plugs .045 gap.

Air fuel meter showing 14.5 at cruise, 11-12 at full throttle.

Stock cam timing. Really pulls well from idle and up to about 3500.
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Old 03-13-2021, 06:57 PM   #16
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wow that seems like a lot of timing for a 392.. whats your stock distributor call for? mine calls for 0 which seems quite retarded but I dont know the cam profile so maube they want a later flame spread..
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Old 03-13-2021, 09:04 PM   #17
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Calls for 0 as well. I think the advance curve is different on the dui, so that might account for at least some of the difference. Book calls for 41 degrees total timing. Remember too i have the 345. It does run a little more timing then the 392.
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Old 03-17-2021, 10:38 AM   #18
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Quote:
Originally Posted by mcduffieja View Post
take a look over at binder planet in their forums for all things International. I had a 304, I don't think there was anything electronic about it.

I was a founding member of the "Binder bulletin" back in the early 90's

When it was Bill Thebert's thing

At one point I was close friends with Glancy as well whose friends own Super Scout Specialists

345 and the 392 are great motors...

last forever

I've always ended up with 304's and I was a big fan of the 4 bangers

I can't tell you how many came back to life from sitting in fields with minimal effort

but after over 20 years of scouts I sold my last a few years ago, moved on to other things, mostly boats
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Old 03-17-2021, 10:49 AM   #19
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I was a member of binder bulletin many years ago too. Actually think I am still a member, but so little on it anymore.
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Old 03-17-2021, 01:47 PM   #20
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Quote:
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I was a member of binder bulletin many years ago too. Actually think I am still a member, but so little on it anymore.
Binder Bulletin is gone.. it has been replaced by "Binder Planet" years ago when Thebert and "someone" had a huge falling out... if you remember the site dropped, and all those SOA write ups as well for a time.

I know Bill USnavy and a few others had a big hand in bringing it back... but by then I was on to raising kid and slowly getting out of the "hobby" even though I kept buying and selling scouts for a bit longer

This was my 68





I was known as "WiredRight" back then (my old company I sold)


I sold it "twice"
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