Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-25-2019, 10:42 PM   #121
Rivet Master

 
1982 28' Airstream 280
Redwood City , California
Join Date: Mar 2008
Posts: 1,891
Quote:
Originally Posted by ROBERTSUNRUS View Post
Hi, and you most likely have a Turbo 475 transmission.

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
__________________

__________________
Let me get out my sharpie and explain it to you!
dadstoy is offline   Reply With Quote
Old 10-26-2019, 02:17 AM   #122
Keen amature
 
martin300662's Avatar

 
1975 20' Argosy 20
Chestfield , Kent
Join Date: Mar 2014
Posts: 2,892
Quote:
Originally Posted by dadstoy View Post
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
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.
__________________

martin300662 is offline   Reply With Quote
Old 03-18-2020, 11:26 AM   #123
3 Rivet Member
 
gaiaenviro's Avatar
 
1987 32.5' Airstream 325
dripping springs , Texas
Join Date: Mar 2014
Posts: 215
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!
gaiaenviro is offline   Reply With Quote
Old 03-18-2020, 11:10 PM   #124
Rivet Master
 
Keyair's Avatar

 
1984 34.5' Airstream 345
Foothill Ranch , California
Join Date: Mar 2010
Posts: 4,587
Images: 1
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 donít last long Iíve 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. Iím sure it also makes the block weaker and therefore more flexible.
Iíve also heard that under big loads this compromises the headgasket sealing too.
You want the maximum ďMassĒ in the block for thermal stability.
If I was going to rebuild a 454 for Motorhome use, I think Iíd got with a minimal overbore and maybe a 1/4Ē 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!
Keyair is offline   Reply With Quote
Old 03-19-2020, 09:15 AM   #125
Silver Bullet
 
choctawmel's Avatar
 
1986 34.5' Airstream 345
choctaw , Oklahoma
Join Date: Mar 2006
Posts: 738
Images: 1
Quote:
Originally Posted by gaiaenviro View Post
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!
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.
choctawmel is offline   Reply With Quote
Old 03-20-2020, 06:19 AM   #126
2 Rivet Member
 
Paul J Mauro's Avatar

 
1985 34.5' Airstream 345
Bolton , Massachusetts
Join Date: Jul 2003
Posts: 98
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
Paul J Mauro is offline   Reply With Quote
Old 03-20-2020, 06:44 AM   #127
CLOUDSPLITTER "Tahawus"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , Milky Way
Join Date: Jun 2007
Posts: 15,193
Images: 1
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
🇺🇸
__________________
"Any nation that can survive what we have lately in the way of government, is on the high road to permanent glory."
Molly Ivins

"My sex life is like a Ferrari...I don't have a Ferrari."
Dino Longuini

Tahawus....🌥
ROBERT CROSS is offline   Reply With Quote
Old 03-26-2020, 12:18 PM   #128
3 Rivet Member
 
gaiaenviro's Avatar
 
1987 32.5' Airstream 325
dripping springs , Texas
Join Date: Mar 2014
Posts: 215
Quote:
Originally Posted by gaiaenviro View Post
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!
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!
gaiaenviro is offline   Reply With Quote
Old 03-26-2020, 03:06 PM   #129
CLOUDSPLITTER "Tahawus"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , Milky Way
Join Date: Jun 2007
Posts: 15,193
Images: 1
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
🇺🇸
__________________
"Any nation that can survive what we have lately in the way of government, is on the high road to permanent glory."
Molly Ivins

"My sex life is like a Ferrari...I don't have a Ferrari."
Dino Longuini

Tahawus....🌥
ROBERT CROSS is offline   Reply With Quote
Old 03-26-2020, 03:25 PM   #130
Rivet Master
 
jeffmc306's Avatar
 
2019 27' Globetrotter
McHenry , Illinois
Join Date: Apr 2018
Posts: 878
Blog Entries: 4
Quote:
Originally Posted by gaiaenviro View Post
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!
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/
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2020-03-26 at 4.23.43 PM.jpg
Views:	6
Size:	214.0 KB
ID:	364035  
__________________

__________________
2019 27í Globetrotter FBT Walnut/Dublin Slate
2018 FC23FB
2019 Ram 2500 6.4 Hemi Laramie Blue Ox 1000#
WBCCI# 10258
RETIRED!
jeffmc306 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 07:52 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.