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10-25-2019, 10:42 PM
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#121
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Rivet Master
Currently Looking...
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Join Date: Mar 2008
Posts: 2,385
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Quote:
Originally Posted by ROBERTSUNRUS
Hi, and you most likely have a Turbo 475 transmission.
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Yup, a 475. I misspoke there! Thanks Bob. I hadn't even finished my bottle of wine before I wrote that...but it was a real shitty day and my mind is spent! Ha Ha
__________________
May a Firefly land upon your shoulder
and bring you good luck, good fortune, and abundance.
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10-26-2019, 02:17 AM
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#122
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Keen amature
1975 20' Argosy 20
Chestfield
, Kent
Join Date: Mar 2014
Posts: 3,535
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Quote:
Originally Posted by dadstoy
Yup, a 475. I misspoke there! Thanks Bob. I hadn't even finished my bottle of wine before I wrote that...but it was a real shitty day and my mind is spent! Ha Ha
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I guess most of us knew exactly what you meant Dean, considering the TH475 is just a TH400 with straight cut gears.
For me the ideal setup would be simple....454HO Chevrolet performance crate engine Connect & Cruise package with the 4L85E. Yes it is 500lb/ft@3500rpm, but more importantly over 400lb/ft@1750rpm, all usable power without swapping to fuel injection. Guaranteed to work out of the box.
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03-18-2020, 11:26 AM
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#123
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3 Rivet Member
1987 32.5' Airstream 325
dripping springs
, Texas
Join Date: Mar 2014
Posts: 220
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OK, so I am now in the position of need for engine rebuild/replacement after the air cleaner nut got sucked in to the engine at 70 mph. From what I have gleaned from this thread, it seems that boring the block .030/060 over, roller cam/lifters/rockers, high flow oil pump, oil coolers, new radiator (specific to mine), MSD ignition, and new heads is the way to go. Am I missing anything? Thanks!
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03-18-2020, 11:10 PM
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#124
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Rivet Master
1984 34.5' Airstream 345
Foothill Ranch
, California
Join Date: Mar 2010
Posts: 4,695
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All Things 454
That sucks(no pun intended!).
I would not go 60 over unless you have no choice. Some MkIV blocks can be bored up to 100 thou over with careful measurement, but they don’t last long I’ve heard.
My understanding, and in some way experience is that the bigger the overbore goes, the thinner the walls get. This leads to flexibility in the bore which reduces ring seal, and therefore blow by. I’m sure it also makes the block weaker and therefore more flexible.
I’ve also heard that under big loads this compromises the headgasket sealing too.
You want the maximum “Mass” in the block for thermal stability.
If I was going to rebuild a 454 for Motorhome use, I think I’d got with a minimal overbore and maybe a 1/4” stroker crank kit. At about $1200/1500 for the complete kit, with new crank, rods, pistons and bearings. They are as cheap as replacing/rebuilding the stock parts. Also, they are new parts and have not been through heat cycles, and then weakened further by grinding undersize. They are also made of better materials, and better quality machining.
Just my 2c.
You just hand the parts to the machine shop and tell them to bore to match.
All in all, unless you are a wacko, like me, buying a crate GM 502 might make sense.
__________________
My name is Steve.... and I am an Alumaholic!
Working in my Garage is like playing TETRIS with Tools!
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03-19-2020, 09:15 AM
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#125
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Silver Bullet
1986 34.5' Airstream 345
choctaw
, Oklahoma
Join Date: Mar 2006
Posts: 839
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Quote:
Originally Posted by gaiaenviro
OK, so I am now in the position of need for engine rebuild/replacement after the air cleaner nut got sucked in to the engine at 70 mph. From what I have gleaned from this thread, it seems that boring the block .030/060 over, roller cam/lifters/rockers, high flow oil pump, oil coolers, new radiator (specific to mine), MSD ignition, and new heads is the way to go. Am I missing anything? Thanks!
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That's want I did.
Make sure to use a heavy duty valve spring locks. I didn't and paid the price.
Dropped a valve outside Los Cruces. NM. Shop there rebuilt it and it run like crap all the way home. Died soon after and I replaced it with a 12 valve cummins diesel which I'm still tinkering with. But then it's my hobby.
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03-20-2020, 06:19 AM
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#126
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3 Rivet Member
1985 34.5' Airstream 345
Bolton
, Massachusetts
Join Date: Jul 2003
Posts: 175
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well it looks like we will have lots of time to work on our toys this summer. wife just informed me colorado said -stay away visitors - I guess we dont go in april ,this will be the year I put a new engine trans in our 345 before we end up doing it on the side of the road
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03-20-2020, 06:44 AM
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#127
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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Just an Idea...🤔
"Connect & Cruise crate powertrain systems
Our engineers did all the hard work, designing and calibrating carefully matched Connect & Cruise powertrain systems for
optimal compatibility and performance, while also identifying the complementing engine and transmission controllers, torque converters and supporting installation kits."
"With 84 Connect & Cruise combinations, Chevrolet Performance provides the ultimate powertrain solution without the need for third-party tuning, sourcing parts you need (with a 24-month/50,000-mile or E-ROD 36 Month/50,000 Miles Connect & Cruise limited warranty included) to help protect your ride. The calibrated controllers are designed for retrofit installations in older vehicles, for easier and quicker installation. The result is a premium package that offers the dependability of Connect & Cruise and the confidence of Chevrolet Performance."
Bob
🇺🇸
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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03-26-2020, 12:18 PM
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#128
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3 Rivet Member
1987 32.5' Airstream 325
dripping springs
, Texas
Join Date: Mar 2014
Posts: 220
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Quote:
Originally Posted by gaiaenviro
OK, so I am now in the position of need for engine rebuild/replacement after the air cleaner nut got sucked in to the engine at 70 mph. From what I have gleaned from this thread, it seems that boring the block .030/060 over, roller cam/lifters/rockers, high flow oil pump, oil coolers, new radiator (specific to mine), MSD ignition, and new heads is the way to go. Am I missing anything? Thanks!
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New wrinkle, what are your thoughts on say an ATK 8.1 Long Block from Jegs rather than the rebuild? I drove a 1-ton for years with that engine and an allison transmission so am familiar with the setup. Ultimately I'll be going back in with an 8.1, but do I rebuild the original or buy a rebuilt Vortec 8.1? Any advantages to either one, besides ease of effort? Thanks!
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03-26-2020, 03:06 PM
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#129
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"Cloudsplitter"
2003 25' Classic
Houstatlantavegas
, Malebolgia
Join Date: Jun 2007
Posts: 20,000
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FWIW....59+years ago when I was a young apprentice, my German mentor came to my rescue on a Volvo 164 that I had dropped a washer down the FI intake.
To my horror he calmly started the engine opened the throttle and held it so until the noise stopped as it exited the engine. He just shrugged his shoulders and said 'been there, done that'.
Now, to the point.
I would go with a FI BB to take advantage of the more up to date improvements. Plus all the reputable builders will offer a warrantee. A big plus to consider.
Bob
🇺🇸
__________________
I’m done with ‘adulting’…Let’s go find Bigfoot.
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03-26-2020, 03:25 PM
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#130
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Rivet Master
2019 27' Globetrotter
McHenry
, Illinois
Join Date: Apr 2018
Posts: 2,204
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Quote:
Originally Posted by gaiaenviro
OK, so I am now in the position of need for engine rebuild/replacement after the air cleaner nut got sucked in to the engine at 70 mph. From what I have gleaned from this thread, it seems that boring the block .030/060 over, roller cam/lifters/rockers, high flow oil pump, oil coolers, new radiator (specific to mine), MSD ignition, and new heads is the way to go. Am I missing anything? Thanks!
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I stumbled across an article on Hot Rod about a motor home big block rebuild and it's pretty straight-forward. If anything, worth a read:
https://www.hotrod.com/articles/bolt...ome-big-block/
__________________
2019 27’ Globetrotter FBT Walnut/Dublin Slate
2018 FC23FB
2019 Ram 2500 6.4 Hemi Laramie Blue Ox 1000#
WBCCI# 10258
RETIRED!
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09-23-2021, 01:31 AM
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#131
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Rivet Master
Currently Looking...
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Join Date: Mar 2008
Posts: 2,385
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Vacuum Advance - Why You Need It!
Here is a nice article on vacuum advance and ignition timing. Who knew it can help keep your engine running cool?
https://www.motortrend.com/how-to/16...gnition-timing
__________________
May a Firefly land upon your shoulder
and bring you good luck, good fortune, and abundance.
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03-23-2022, 12:06 PM
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#132
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1 Rivet Member
Currently Looking...
1986 34.5' Airstream 345
Sunrise
, Florida
Join Date: Mar 2022
Posts: 17
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Thanks for all that info , Im newbie just got my first 1986 Airstream 345 it has about 110,000 miles on 454 is running rough I need to a tune up or some one recommended replacing the original carburetor for a new Eldebrock 650 he sad he's getting better performance , what do you think is a good advise ?
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03-23-2022, 05:20 PM
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#133
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Rivet Master
1984 31' Airstream310
Honokaa
, Hawaii
Join Date: Jun 2010
Posts: 993
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Lots of possible reasons for rough running. I would start with a compression test to confirm that the engine is ok internally. If it is and the plugs, plug wires, and distributor look old they can all be replaced for less than the price of a carburetor, giving you a new ignition system. The quadrajet on our 1990 345 was old and leaky, it was always flooding the engine. I got an exact replacement rebuilt unit from Summit, it works fine.
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03-25-2022, 05:55 PM
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#134
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Rivet Master
1979 24' Airstream Excella 24
Tipp City
, Ohio
Join Date: Feb 2012
Posts: 551
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I bought a rebuild kit from Carb Junkies, watched a few videos on you tube and rebuilt my quadrajet a few years ago. Truth be told I probably had more than $400 worth of my time involved in the process but, the thing runs , starts and idles great. The new TBI conversions are clearly the best option but, if you are on a budget the quadrajet is a viable option.
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02-26-2023, 01:30 AM
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#135
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2 Rivet Member
Renton
, Washington
Join Date: Jun 2021
Posts: 34
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One can get a condenser/oil cooler combination set up for some of the 'P series' coaches... http://acmeairparts.com/home.html
I did this job on my 1994 Fleetwood Southwind Storm back in August 2022. I replaced the condenser/oil cooler combo and while I had it out clean out the radiator fins which were very dirty (impossible to do from the front side). Then replaced the AC drier, O-rings and pulled vacuum. Then re-filled the AC system.
System held 30in of vac for nearly 22 hours. Readjusted the air gap on the compressor to within spec. It was at .09 (spec is .04-.08). Blows nice and cold.
I documented the repair here:
https://www.gmt400.com/threads/conde...-cooler.59140/
__________________
1994 Fleetwood Southwind Storm 28ft
VIN#1GBJP37N4R3314754 (454 7.4L TBI w/4L80E)
1972 VW Westy hardtop-2056cc Type-4 Massive
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