3" to 4" Riser Conversion
#1
Registered
Thread Starter
Join Date: May 2007
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
I recently scored a set of like new Manifolds with the 4" risers (I believe all '87 and newer had these). My boat currently has the 3" risers on them now. What would it take to change to the 4", is it as simple as using the 4" coupler? Are the angles different?
#2
Go Big or Go Home
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Jun 2005
Location: Kennebunkport, Me.
Posts: 201
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
should be no problem some of the older 3 inch models had a round y pipe instead of the oval. as long as you can come up with the right plumbing it will work. or if it were going out through the hull you would need new exhaust tips.
#4
Go Big or Go Home
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Jun 2005
Location: Kennebunkport, Me.
Posts: 201
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
just a block off plate. and the holes in the transom for the exhaust thru hull tips. you can also plug your y pipe with wood blocks and accomplish the same thing with out pulling the engine.
#5
Registered
Thread Starter
Join Date: May 2007
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
Cool, I think I might just do that. I've already got the motor out for rebuild so I can just pull the y-pipe and put in a block off plate. I guess I should buy some tips with flappers on them.
Thread
Thread Starter
Forum
Replies
Last Post
FASTTIMES
General Boating Discussion
1
08-30-2007 04:28 PM
Ben@SRP
Trucks, Trailers and Transportation
14
10-13-2006 09:11 AM
mikesufka
General Boating Discussion
8
12-26-2002 11:23 AM