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Old 01-25-2016, 08:09 AM   #169
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It should be pretty much a bolt in other than transmission mount rework. The motor mounts look to be the same as the 350/454. The height might be an issue but I don't think so as I think the distributor is shorter which makes the intake seem taller.

Thinking about upgrading?
One thing I forgot to mention. For Martin and myself this would be an easy swap for the most part. If your rig has a parking brake drum on the back of the transmission you would need to find a combo with a transmission that also has the brake drum attached.

Our little 20's don't use the parking brake drum, just the pedal in the cab with cables going back to the rear brake drums at the rear wheels. The 4L80e that I just had rebuilt had the parking brake drum and I had the shop convert it over to the 2 wheel drive model without the drum. I'll be sending all of the drum parts to Keyair for his future conversion. No parts wasted in this swap
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Old 01-25-2016, 08:17 AM   #170
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Originally Posted by bkahler View Post
It should be pretty much a bolt in other than transmission mount rework. The motor mounts look to be the same as the 350/454. The height might be an issue but I don't think so as I think the distributor is shorter which makes the intake seem taller.

Thinking about upgrading?
Ideally after I ship Bella back to UK (so that I can register with a 'stock 350'). but as these combos aren't that common over there, maybe I can get one, have it looked at to make sure it is OK over here, then getting it shipped over to UK to be ready.
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Old 01-25-2016, 08:32 AM   #171
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If you do decide to go that route be sure and get all of the electronics associated with that engine from the vehicle it came from. The wiring harness, PCM and other associated bits and pieces will make a huge difference when installing a more modern engine into the antique Argosy chassis

I've decided to install a TBI on my engine and that's what I've been finding, all the bits and pieces are the hard part
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Old 01-25-2016, 09:38 AM   #172
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Ideally after I ship Bella back to UK (so that I can register with a 'stock 350'). but as these combos aren't that common over there, maybe I can get one, have it looked at to make sure it is OK over here, then getting it shipped over to UK to be ready.
Better yet, buy a wrecked low mileage vehicle with good running gear and ship it some where and then take your time stripping it for all the parts you want. You'll have everything you need if you go that route.
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Old 01-25-2016, 10:12 AM   #173
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Better yet, buy a wrecked low mileage vehicle with good running gear and ship it some where and then take your time stripping it for all the parts you want. You'll have everything you need if you go that route.
What's that saying about 'great minds thinking a like....'? I have started searching Craigslist already. Especially if I can get it running well here, then shipped in a container, ready to swap. Confidentially I bought my brother (in the UK) a new 2 ton engine hoist and stand when I visited over Christmas!
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Old 01-25-2016, 11:10 AM   #174
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What's that saying about 'great minds thinking a like....'? I have started searching Craigslist already. Especially if I can get it running well here, then shipped in a container, ready to swap. Confidentially I bought my brother (in the UK) a new 2 ton engine hoist and stand when I visited over Christmas!
Well, great minds and all and then there's mine

Sounds like you've been planning a power plant change already.

Don't bother with a wrecked one, buy a decent running truck, put the windows you just bought in the back and ship the whole lot in a container.
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Old 01-25-2016, 11:55 AM   #175
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Thanks Brad. The one thing I'd do different if I did this kind of exhaust again would be to have the 3.5" outlet run over the axle and exit at the rear of the motorhome. It would add some cost but decrease the sound quite a bit. With it exiting in front of the tires, and the windows open in the motorhome while we drive, I get quite a bit of exhaust sound. On a longer trip it can be annoying. With a motorhome, designed to chug along at 60mph I'm not interested in having people hear my big block. Silent is better. Your 350 might not be a problem as its probably going to be quieter by default.
Just some thoughts.
BG
Ben, your comment above stuck with me and now that I'm looking for a muffler I wanted to revisit the issue.

I found the following info on the GM Full Size website recently.

"The Magnaflow XL series is the more aggressive of the two muffler styles being discussed here. The XL mufflers are chambered mufflers as opposed to the straight-through design discussed above. When most people think of chambered mufflers, they think of Flowmaster. The Magnaflow XL line is similar to a Flowmaster style muffler in the sound it will produce. Sizing options in the XL line range from 14" length oval case mufflers up to 34" case length, 7" round diameter mufflers.

With the chambered mufflers, there are offset inlet and outlet pipes which route the exhaust gasses through baffles inside the muffler. The chambers inside the muffler are meant to essentially "tune" the exhaust noise, while removing or masking any raspy notes. You should expect a louder, more boomy exhaust note from the XL Mufflers. The best way to describe the XL sound would be saying it's an exhaust noise that you can hear and feel.
Chambered mufflers by nature will produce a certain amount of resonance and vibration which is normally associated with exhaust drone. Under sizing a chambered muffler with your V8 is the quickest way to rattle your teeth loose on that next highway trip. However, a properly sized chambered muffler can produce some of the most desirable exhaust tones with lessened risk for drone.
If cabin drone is a concern or an existing problem, we will recommend using a Magnaflow 5" or 6" round muffler in various sizing options as a resonator to help combat cabin drone while still retaining an aggressive exhaust note."


Now I'm wondering if there are any other muffler options out there. I know the 84 310 I had didn't have any exhaust noise to speak of. You could hardly hear the exhaust.
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Old 01-26-2016, 07:22 AM   #176
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Brad, I'll have to crawl under the moho and see if I can get a pic of the series designation on the muffler. should be stamped in there somewhere... I"m pretty sure they installed a fleet muffler of some kind. Definitely a big truck (box truck style) muffler. The drone isn't really that bad. I'm honestly OK with the sound from the tailpipe. Its just that it dumps too close to the middle of the motorhome. While I'd take a silent muffler if it was available, the one I have is very adequate, if it was just routed to the back.
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Old 01-26-2016, 07:44 AM   #177
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Ben, you don't need to go to all that effort. I figured I wouldn't need to buy a muffler for a while, however my engine is on a test stand and I need to do some more testing (TBI installation) so I need to install a muffler to provide some back pressure for the O2 sensors to work properly.

So if I'm going to buy a muffler I might as well only buy one and use on the test stand and on the coach.

I don't think I'll be able to route an exhaust pipe all the way to the rear. I have a fuel tank right behind the diff that fits between the frame rails and then behind that is the generator. Not a lot of room for an exhaust pipe to be routed.
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Old 01-26-2016, 07:51 AM   #178
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I don't think I'll be able to route an exhaust pipe all the way to the rear. I have a fuel tank right behind the diff that fits between the frame rails and then behind that is the generator. Not a lot of room for an exhaust pipe to be routed.
Ah.. well, at least route your dump out the passenger side if you can. However, that puts your dump by your door which isn't great either.. Choices!!
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Old 01-26-2016, 09:25 AM   #179
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Unfortunately the only safe location to dump is just in front of the drivers side rear wheel. The passenger side has the side saddle fuel tank just rear of the entry door and extends to the rear wheel.

So, I'll exit the drivers side just in front of the rear wheel. That's about the same location my 310 exited and it was quiet so there's still hope
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Old 01-26-2016, 11:16 PM   #180
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Well, great minds and all and then there's mine

Sounds like you've been planning a power plant change already.

Don't bother with a wrecked one, buy a decent running truck, put the windows you just bought in the back and ship the whole lot in a container.
OK what am I missing....every 2500HD or derivative (gasser) I can find for sale is the 6.0L with a 4L80E - were the 8.1L/Allisons rare? I can't find a single 5 speed let alone 6 speed truck for sale!
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Old 01-26-2016, 11:38 PM   #181
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You guys should sign up for your state salvage auction site. Here in Washington in addition to the state patrol cars and usual pick-ups and sedans they also auction lots of school buses. They go for give way prices and have lots of interesting diesel and big block gas engines with pretty tough transmissions. And they usually get pretty good maintenance.
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Old 01-27-2016, 05:48 AM   #182
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OK what am I missing....every 2500HD or derivative (gasser) I can find for sale is the 6.0L with a 4L80E - were the 8.1L/Allisons rare? I can't find a single 5 speed let alone 6 speed truck for sale!
I know I can't answer your questions as I've never really been a Chevy guy. I've mostly owned Triumph sports cards and Ford trucks

Dan has some good advice although if you're looking for low mileage I doubt that you'd find one in a State salvage auction. I think the only high mileage engine I would buy would be a diesel since they typically far out last gas engines.

While you're doing your searching I'd search mainly in the south and south west where you'll find trucks in much better condition, at least as far as rust goes.
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