Go Back  Offshoreonly.com > Technical > General Q & A
454 mercruiser ex manifolds >

454 mercruiser ex manifolds


454 mercruiser ex manifolds

Old 08-05-2011, 02:13 PM
Thread Starter
Join Date: Feb 2004
Location: MT. JULIET, TN.
Posts: 3,710
Received 2 Likes on 1 Post
Default 454 mercruiser ex manifolds

Who has the best price on these?? I need to replace a set on a cruiser.
kennyo is offline  
Old 08-05-2011, 05:18 PM
Join Date: Jul 2009
Location: Grosse Pointe Farms, MI
Posts: 1,570
Likes: 0
Received 2 Likes on 2 Posts

Originally Posted by kennyo
Who has the best price on these?? I need to replace a set on a cruiser.
Get a set of used freshwater manifolds. They're generally like new and they're about 90% cheaper ($150). GLM also makes some cheaper knock-offs, but I've never used them.

Is your exh. 3" or 4"?
wjb21ndtown is offline  
Old 08-05-2011, 08:28 PM
Join Date: Mar 2008
Location: TEXAS
Posts: 116
Likes: 0
Received 0 Likes on 0 Posts
Default Glm

Originally Posted by kennyo
Who has the best price on these?? I need to replace a set on a cruiser.

I believe GLM makes cast aluminum replacements (semi tuned) with runners almost to the risers.
TEXASRPM is offline  
Old 08-06-2011, 08:05 PM
Join Date: Dec 2008
Posts: 89
Likes: 0
Received 1 Like on 1 Post
Default Mercruiser 454 manifolds by Dennis Moore

Recently we (Moore Performance) received a dyno sheet from Wyo Tech marine school in Daytona Beach. A customer supplied the school with a stock 454 (with stock Mercruiser manifolds) and GLM replacement manifolds. The replacement GLM manifolds increased performance by 12 horsepower at 4600 rpm over the stock manifolds.
We were totaly unaware that the test was being performed
and were pleasantly suprised by these unsolicitated results.

We have tested the GLM manifolds ourselves and have seen similar results on the dyno.

This increase is from a replacement manifold that has the same dimensions as the stock Mercruiser manifold (a direct bolt-on replacement) with internal manifold runner improvements. These improved exhaust passages are a result of using an ultra modern/hi-tech foundry that utilizes "Lost Foam" casting for improved quality.
Not everything made in China is junk. China has some of the most modern foundries in the world.

Dennis Moore
[email protected]
Dennis Moore is offline  

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

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.