RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Duramax Engine Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 07-01-2019, 07:02 PM   #1
murphylawe's Avatar
Fleetwood Owners Club
Join Date: Oct 2016
Posts: 36
No Vortex Forum, but I have a question...

Hey everyone,

Apologies for posting in the Duramax forum, but there isn't a forum for Vortec and I have a question.

My engine is not running the way a 454 should and I have decided to build out a new engine. I have experience in building racing engines, decades ago. I have built out 350's, 426 Hemi's, a couple of 454's, and a 460 punched-out to 490. Some burned gas, and others methanol.

I know how to build a track-monster, been there done that. I need a torque-monster, and that is a different show entirely. Different torque bands, lower RPMs, just never built an engine for that type of performance.

SOooo... to make a long story shorter, I am here to pick your brains. I live on a pretty tight budget, like don't we all, but have a phenomenal aptitude for engines and have rebuilds that lasted for years.

I need to know how far to push the boring (or bore it out at all), piston suggestions, cam suggestions, etc.

I know a machine shop that does excellent work for me at a stunningly low price, so I have the cleaning and boring of the block covered. They will also deck, polish, and port the heads if I desire. I will assemble them and just about everything else to keep the costs manageable.

So, I await your towing engine wisdom.

Cheers everyone!

murphylawe is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-03-2019, 12:54 AM   #2
Senior Member
Skip426's Avatar

Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,498
I came from a drag racing background too , but jumped into RVing with the Dodge 8.0L , V-10 as my primary long distance tow vehicle. 305HP , 450 ftlb torque.
Partially because working on Dodge/Cummins all day didn't put me in a good frame of mind for owning one.

But on to your questions .
Cylinder wall taper will tell you how much boring you'll require , JMHO , don't go further than necessary.
454 truck engines were stout from the factory , I can't say if there would be a torque cam available , much better than factory grind.
Port/polish , works best on high RPM motors , my 426 liked it , but at 4,000 rpm , which will probably be top of the heap for your application , probably not worth the effort; unless your planning on headers , then port matching to the exhaust gaskets and header flange is in order.
You didn't give a year ? Are you dealing with a carb or EFI engine?
Have you done any diagnosing on your power issue ? Compression testing ?
You'll want be able to run regular gas , so compression ratio change probably not a good idea.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 07-03-2019, 06:46 PM   #3
Senior Member
Isaac-1's Avatar
Join Date: Jun 2016
Location: SW Louisiana
Posts: 3,648
You might try posting in the Workhorse forum since almost all Workhorse coaches had either the 7.4L Vortec or 8.1L Vortec engine.
2002 Safari Trek 2830 on P32 Chassis with 8.1L
Isaac-1 is offline   Reply With Quote
Old 08-06-2019, 09:37 AM   #4
Junior Member
Forest River Owners Club
Join Date: Mar 2014
Location: Austin TX
Posts: 6
Send a message via AIM to mikeintx Send a message via Yahoo to mikeintx
Look at marine cams for a 454 they have an awesome flat torque band. Headers with dual exhaust and a good valve job.
mikeintx is offline   Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Have you ever heard of Vortex Generators? jerichorick MH-General Discussions & Problems 35 01-01-2019 11:28 AM
*sob* But.. but.. BUT I DON'T WANNA go home! MTSam Outdoors RV Owner's Forum 31 09-04-2018 05:46 AM
have 100w solar but thinking add on wind generator but have questions please. US RV As-is iRV2.com General Discussion 44 04-07-2018 03:36 PM
Vortex 8.1 vs Triton? gp44 Class A Motorhome Discussions 11 05-31-2010 09:17 PM
FUEL INJECTOR ADDITIVES FOR 8.1 VORTEX MUSIC MAN Workhorse and Chevrolet Chassis Motorhome Forum 23 12-30-2008 04:26 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:27 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.