LSx into Jet Boat??
I was curious if people were running flywheels or flexplates with their setups?
We had an Fbody flywheel so we used that! I'm guessing it will help to keep the boat accellerating out of the hole when pulling a heavy skiier/wakeboarder with all the weight/stored energy from the stock steel flywheel.
I have a heat exchanger already for the transmission and engine oil cooler. Wondering if I should run a second cooler for the engine coolant as I plan to go with a closed system.
Will post more pics tomorrow. We modified the engine mount adapters to move the boat mounts further forward.
We had an Fbody flywheel so we used that! I'm guessing it will help to keep the boat accellerating out of the hole when pulling a heavy skiier/wakeboarder with all the weight/stored energy from the stock steel flywheel.
I have a heat exchanger already for the transmission and engine oil cooler. Wondering if I should run a second cooler for the engine coolant as I plan to go with a closed system.
Will post more pics tomorrow. We modified the engine mount adapters to move the boat mounts further forward.
Thread Starter
Joined: Dec 2005
Posts: 314
Likes: 0
From: Mackinaw, IL
Soon!
Hey bud! Thanks! I would love nothing more than to put a set of twins on this biotch 
It was great talking to you and your wife on powertour. Hope y'all had a safe trip home.
PM me that website address you told me about. I looked but could not find it.
It was great talking to you and your wife on powertour. Hope y'all had a safe trip home.
PM me that website address you told me about. I looked but could not find it.
Thread Starter
Joined: Dec 2005
Posts: 314
Likes: 0
From: Mackinaw, IL
I was curious if people were running flywheels or flexplates with their setups?
We had an Fbody flywheel so we used that! I'm guessing it will help to keep the boat accellerating out of the hole when pulling a heavy skiier/wakeboarder with all the weight/stored energy from the stock steel flywheel.
I have a heat exchanger already for the transmission and engine oil cooler. Wondering if I should run a second cooler for the engine coolant as I plan to go with a closed system.
Will post more pics tomorrow. We modified the engine mount adapters to move the boat mounts further forward.
We had an Fbody flywheel so we used that! I'm guessing it will help to keep the boat accellerating out of the hole when pulling a heavy skiier/wakeboarder with all the weight/stored energy from the stock steel flywheel.
I have a heat exchanger already for the transmission and engine oil cooler. Wondering if I should run a second cooler for the engine coolant as I plan to go with a closed system.
Will post more pics tomorrow. We modified the engine mount adapters to move the boat mounts further forward.
Water jacketed aluminum lowers/risers, marine style starter, marine style alternator ordered today.
I purchased another set of lowers/risers to get a better deal. I have no use for them. PM me if interested in them and more details. They are designed for LS style engines and are a bolt on affair. I hope to get them by Monday at the latest.
I purchased another set of lowers/risers to get a better deal. I have no use for them. PM me if interested in them and more details. They are designed for LS style engines and are a bolt on affair. I hope to get them by Monday at the latest.
They arrived yesterday. I actually sprayed water in them to see the path it would take. There was also a bit of sand casting left in them from the foundry. I have a 2nd set as mentioned for someone else taking on a project like this.
These can be run on either side as shown by the ports drilled/tapped on top of the lower manifolds.
Here are the risers!
In the risers you can see a water jacket exit on the bottom side....
Here is another one on the top where the bulk of the water exits from the entry port located at the front of the riser. It has the main opening and also one on either side of it that flows water as well.
What it looks like combined.
These can be run on either side as shown by the ports drilled/tapped on top of the lower manifolds.
Here are the risers!
In the risers you can see a water jacket exit on the bottom side....
Here is another one on the top where the bulk of the water exits from the entry port located at the front of the riser. It has the main opening and also one on either side of it that flows water as well.
What it looks like combined.
Last edited by gnx7; Jul 28, 2010 at 04:31 PM.
Thread Starter
Joined: Dec 2005
Posts: 314
Likes: 0
From: Mackinaw, IL
Those look pretty good man. I would love to see them bolted up to the engine to see how far away they are from the valve covers/coils. That is the primary reason I didn't use those manifolds on my jet. Those might be the hot ticket for a sterndrive setup though.
Now that I've got one boat swapped to an LS...it's for sale so I can do it to my new boat! I've now got a 21' Liberator tunnel hull cat style jet boat with a BBC that's just begging for an LS1. So...if anyone wants one of these already swapped, shoot me a PM or see the ad in the Texas classifieds section.
And GNX, sent you a PM about your manifolds.
And GNX, sent you a PM about your manifolds.
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On The Tree
Joined: Nov 2010
Posts: 169
Likes: 5
From: carlsbad
couple questions.
are you running saddle tanks? i am trying to figure out how to do a return line
where did you end up mounting the computer and electronics to keep it dry?
Thread Starter
Joined: Dec 2005
Posts: 314
Likes: 0
From: Mackinaw, IL
The ecm and fuel pump are mounted on the side panel of the engine compartment behind the seat. No real worry about keeping them dry. The ecm is a sealed unit that is typically mounted under the hood anyway, and the fuel pump is often submerged in the fuel tank.
I have saddle tanks and have been thinking on this also. I think I'm going to weld a -12 fitting to the rear lower area of each tank, run a line from one ank to the other with a T in the middle for the return. If I don't do this I'll run 2 pumps 1 from each tank, 2 FPR's, a return to each tank, and a one way valve before both fuel rails and a crossover line between the rails. This way if a pump fails it should pressurize both rails before shutting the furthest valve allowing the engine to still run. Overkill, maybe but theres nothing like having a back up Plus this way I don't have to mess with the tanks.
Plus this way I don't have to mess with the tanks. 
Teching In
Joined: Dec 2010
Posts: 42
Likes: 0
From: Way North in CALI
So i have a question for you guys here.. ( im on PB forum too same name)
Is a front drive LS the same block design as a Rear drive LS engines bell housing the Same ?
I been seeing some good deals on LS4's outa impallas and grand prixs..
I have a 72 Avenger same kinda boat as Compressor Surge..
and looking to swap to an LS before next boat season..
Not sure weather im keeping the FI, or gonna carb it yet.
Is a front drive LS the same block design as a Rear drive LS engines bell housing the Same ?
I been seeing some good deals on LS4's outa impallas and grand prixs..
I have a 72 Avenger same kinda boat as Compressor Surge..
and looking to swap to an LS before next boat season..
Not sure weather im keeping the FI, or gonna carb it yet.
On The Tree
Joined: Dec 2009
Posts: 123
Likes: 6
From: Taipalsaari, Finland, Europe
[QUOTE=Chris1530;14230421]So i have a question for you guys here.. ( im on PB forum too same name)
Is a front drive LS the same block design as a Rear drive LS engines bell housing the Same ?
I been seeing some good deals on LS4's outa impallas and grand prixs../QUOTE]
Yep, they all are the same. As far as bellhousing is concerned.
Is a front drive LS the same block design as a Rear drive LS engines bell housing the Same ?
I been seeing some good deals on LS4's outa impallas and grand prixs../QUOTE]
Yep, they all are the same. As far as bellhousing is concerned.
Yep, they all are the same. As far as bellhousing is concerned.
LS4:
LSx:
Teching In
Joined: Dec 2010
Posts: 42
Likes: 0
From: Way North in CALI
Heya Mr. Compressor Surge,
I was wondering if you could give me an idea as to the basics of what you deleted, and what you left in your harness ?.
thanks
I was wondering if you could give me an idea as to the basics of what you deleted, and what you left in your harness ?.
thanks
Last edited by Chris1530; Feb 28, 2011 at 09:41 PM.