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Old 02-14-2017, 09:51 PM   #1
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Teach me (?!?!?!?)

Specs: Chevrolet 5.7 gas engine on a short bus.
Looks like pluming from house vs stuff I see in engines.
What is it being used for in the pics? Is it okay safe to use in a car?



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Old 02-14-2017, 09:56 PM   #2
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those are heater connections... they are using ball valves to turn on and off the hot coolant flow into the bus cabin for heating...

the factory heasters from Chevy would just be for the dashboard.. so when a bus body is installed by the 3rd party coach builder, they install their own heater connections and attach them to the chevrolet system..

csant tell exactly but almost looks like thats a heater-only system without A/C? or i just cant see the A/C connections.
-Christopher
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Old 02-14-2017, 09:57 PM   #3
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If I'm not mistaken that looks like the shut off for your secondary heater. The "5 1/2 Qt" would be a fluid quantity. The box above "vortec" is the air cleaner.

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Old 02-14-2017, 10:01 PM   #4
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Seems that it has the heater condenser on the side.
It also has rear AC too.

The unit is in rusty northern USA so im sure the heating was their priority.

Thanks for the lesson

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Old 02-14-2017, 11:21 PM   #5
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That's a fantastic motor.

The Vortec engines make great power.
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Old 02-14-2017, 11:25 PM   #6
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Yeah, I knew about the engine (from eastcoast teaching me)

I just thought that piping looked different than my Honda fit
Looks like stuff I can get at HD.



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Old 02-14-2017, 11:33 PM   #7
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Yeah, I knew about the engine (from eastcoast teaching me)

I just thought that piping looked different than my Honda fit
Looks like stuff I can get at HD.

Yep. Just good ole pipe fittings.

Regarding the engine... Have you ever driven anything with the GM TBI 350 that preceded the Vortec 5700? The difference in power is absolutely amazing.
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Old 02-14-2017, 11:35 PM   #8
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Yep. Just good ole pipe fittings.

Regarding the engine... Have you ever driven anything with the GM TBI 350 that preceded the Vortec 5700? The difference in power is absolutely amazing.
Well, I drive a Honda fit and wife a Toyota corrolla. Lol
Biggest engine I've driven is a 7.3L and what ever they have on the big Uhaul trucks.

I've been advised to try to get a 5.7 or 6.0 Chevy engine. Im looking for a van chassis.

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Old 02-15-2017, 04:58 AM   #9
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The 4.8 is also good, just not as powerful as the 6.0
One work truck I use is STRONG at 160,000 with the 4.8.
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Old 02-15-2017, 07:31 AM   #10
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Those fittings will outlast the bus. Alot of stuff on engines (especially domestic) use NPT threads. (Pipe Tap threads). The Metal fittings are fine, DO NOT replace them with PVC, or the Grey plastic stuff from Home depot. Those will not handle the heat, and will have a service life of minutes.....
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Old 02-15-2017, 07:36 AM   #11
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the only issue with the 4.8 is there were not nearly as many of them made so parts are harder to find.. but ECCB is riught they are a good reliable engine..

I know plenty of 5.3's and 6.0 Vortecs running at 250k plus miles.. and of course the 5.7 is what as known as a 'Chevy 350' and parts are everywhere for those..

ive spent a lot of time building various variants of the '5.7' from mild to wild, simple, to fully computerized...

the yellow handle valve in the pic is a 'ball valve' and we routinely used these same valves in commercial building High temperature hot water heating systems.. very rarely would i have one leak.. and if I did they are a cinch to change..

-Christopher
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Old 02-15-2017, 07:42 AM   #12
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Parts for a 4.8 can be found at any parts store.
Just as easy to find as the 6.0 stuff. Or are you talking about performance stuff?
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Old 02-15-2017, 07:51 AM   #13
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Parts for a 4.8 can be found at any parts store.
Just as easy to find as the 6.0 stuff. Or are you talking about performance stuff?

more serious stuff like heads , computers etc on the used market for repairing of failures in a less costly manner..

the earlier 4.8s suffered from the same issues as some of the early 5.3's which was micro-0cracks in the heads that allowed oil permeation..

regular parts such as accessory drives (A/C PS, tensioners etc) are all the same as the 5.3 and of course new and factory parts are available..

when I blow up an engine I tend to look to used spots of Hard-core parts like cranks, heads, and electronics like the computers..

the van in this thread is a 5.7 and I see unmolested 5.7 Express and savannah vans all over the bone yards..
-Christopher
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Old 02-15-2017, 09:59 AM   #14
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The 4.8 I'm looking at is newer, low miles, clean, and here in Florida. It will probably go for much more than this 5.7.
I'll throw a bid at it and hope for the best.

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Old 02-15-2017, 10:42 AM   #15
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The 4.8 I'm looking at is newer, low miles, clean, and here in Florida. It will probably go for much more than this 5.7.
I'll throw a bid at it and hope for the best.

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thats the best way. toss a bid out.. do it the ECCB way.. toss out a bid and if it sticks then bam! you got a bus.. if not then theres aniother to bid on somewhere else
-Christopher
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Old 02-15-2017, 11:34 AM   #16
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Just try and only do it one bus at a time. I've seen on here where people do start bidding on multiple busses only to win them all and have to pay $ to back out.
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Old 02-15-2017, 01:35 PM   #17
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Quote:
Originally Posted by oricha1984 View Post
The 4.8 I'm looking at is newer, low miles, clean, and here in Florida. It will probably go for much more than this 5.7.
I'll throw a bid at it and hope for the best.

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I would, its a really nice one from the pics anyhow. That would be a great van/bus for you guys. The 4.8 does pretty good on gas, too. It will have plenty of power, I've towed with one. Ours is a 2002 with 150 or 160 on it and runs like new.
Heck, I'd even take a 4.3 in a van. The 4.3 is one of my favorites. I had a truck with one and it towed just fine and got really good mpg's.
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Old 02-15-2017, 01:45 PM   #18
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I have 4.3 in a truck now and it's great!

The old astros with 4.3 were runners!!

4.3 is basically a 350 with 2 less cylinders , fantastic v6 engine .

Ok well I'm a Chevy man through and through when it comes to gassers

Lotsa smiles on my face from chevies over the years


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Old 02-15-2017, 10:08 PM   #19
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Appears to be an L31 Vortec 350, 5 1/2 Quarts for the oil capacity. l'd love to convert the L05 350/5.7 TBI engine in my Olds to a L31, but the torque, gears and posi makes it feel a lot like a LT1 car.
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Old 02-16-2017, 11:39 PM   #20
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Here comes another noob question:
So I was reading description on buses and came across this.

2003 Chevrolet US Bus - titled as an 05 CHE STU

2005 FORD Thomas - titled as an 06 THO 041

2004 GMC Thomas - titled as an 06 THO

Why would they title as something else? Any potential problems?

FYI: these buses come from a fleet, not some random eBay person.

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