Like Tree0Likes

Tuning up a 454 Magnum

Reply
Old 09-29-2006, 03:25 PM
  #1
Registered
Thread Starter
 
StillHaulin@63's Avatar
 
Join Date: Jun 2006
Location: California
My Boats: 2000 Baja 232 Boss
Posts: 361
Default Tuning up a 454 Magnum

My 454 Magnum MPI has needed a valve job for a while now. A compression test by my mechanic showed two weak cylinders (#[email protected] & #[email protected]) and although the engine has performed flawlessly (except for a rough idle and less-than-max RPMs) during the last 40 hours, I think it’s time to move forward and get the work done along with a tuneup.

Other than performance restoration, my objective is to stay somewhat “stock” yet obtain a solid 385-400hp with cost and reliability being a key factor. Since there is some corrosion on one of the manifolds, I am considering replacing the stock manifolds and risers with Revolution Marine’s polished aluminum product, primarily because of the appearance. Although I boat exclusively in saltwater, the engine is flushed completely after each use with SaltAway included every third flush. With this increased exhaust capability, I was thinking about replacing the stock flame arrester with a K&N version to hopefully allow an increased airflow through the MPI. I am assuming this simple exhaust modification, along with restoring all of the cylinders, should bring the engine to the 385-400hp level.

Do you think my assumption is correct ..... and
is the use of an aluminum manifold on a saltwater boat a mistake?
StillHaulin@63 is offline  
Reply With Quote
Old 09-29-2006, 03:46 PM
  #2
JC Performance Engines
Gold Member
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,810
Default Re: Tuning up a 454 Magnum

I went w/ Stainless Marine Gen2 manifolds.
Come w/ a 5yr warranty. Great Quality, just not the prettiest.
Salt water use only for me.
Stormrider is offline  
Reply With Quote
Old 09-29-2006, 04:05 PM
  #3
Registered
Thread Starter
 
StillHaulin@63's Avatar
 
Join Date: Jun 2006
Location: California
My Boats: 2000 Baja 232 Boss
Posts: 361
Default Re: Tuning up a 454 Magnum

Quote:
Originally Posted by Stormrider
I went w/ Stainless Marine Gen2 manifolds.
Come w/ a 5yr warranty. Great Quality, just not the prettiest.
Salt water use only for me.
Thanks Stormrider
Did you notice an increase in performance with the Stainless Marine manifolds?
StillHaulin@63 is offline  
Reply With Quote
Old 09-29-2006, 04:21 PM
  #4
JC Performance Engines
Gold Member
 
Stormrider's Avatar
 
Join Date: Jul 2002
Location: Long Island, NY
My Boats: 2003 28 Pantera - SOLD
Posts: 8,810
Default Re: Tuning up a 454 Magnum

Well, i did a full performance rebuild to a 461ci and 560hp & 550lb/ft.
So i'd have to say yes.
My engine was also very tired prior to rebuild.
Attached Thumbnails
Tuning up a 454 Magnum-p1010042-1.jpg  
Stormrider is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
BigFish
General Q & A
5
02-20-2008 01:00 PM
mark30h
General Q & A
0
02-05-2006 04:33 PM
R-Don
General Q & A
13
02-07-2005 09:18 PM
rcannon
General Q & A
2
07-12-2004 11:02 PM
LA3
General Q & A
3
05-12-2004 01:12 AM



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 09:21 PM.


Copyright 2011 OffShoreOnly. All rights reserved.