Performance Boats Forum banner
1 - 20 of 90 Posts

·
Registered
Joined
·
201 Posts
I have been thinking about an LS boat motor for a while, it is a no-brainer from a weight and power standpoint. And its a no brainer from a cost standpoint if you run an iron block 6.0 from a truck (LQ4 or LQ9). These things are high RPM screamers, with no oiling problems or heavy bottom end problems (limiting RPM with stock parts) like typ old school big blocks. The main problem is manifolds/headers. Nobody makes or sells them cheap enough to justify the cost. Indmar makes some but they are way too much money, and I heard Indmar wont sell the manifolds by themselves to the public at any cost (they want you to pay them $5 million for a gay stock 300 hp EFI wake boat LQ4).

There are affordable stand alone spark controllers (msd and edelbrock) to fire the coil-on-plug, and carb manifolds to be able to run marine carb. I like efi but it would be too much hassle on a boat (IMO).

As a work-around for the manifolds, I started looking into figuring out the port spacing of the LS series, and making up an adapter to run BBC or BBF logs/headers based on which one (BBC or BBF) is closest match to the LS port spacing. The internet is devoid of those kinds of data unfortunately.

DO IT and post up the details.
 

·
Registered
Joined
·
1,119 Posts
Ls1

I'm in the talking stages of building a 19 So Cal tunnel with a turbo charged LS1 Ultra just built a 23 tunnel for one of our customer in the trailer park and I was really impressed with the performance. This LS1 had a small Whipple supercharger on it and in the 23 it ran 70 mph light load of fuel, no gear and 2 people in the boat but still some very impressive numbers.
 

·
Registered
Joined
·
3,623 Posts
ive done some dyno testing on ls1 and ls2 engines and they are pretty impressive.

I've got a 5.3L ls1 in my '73 Chevy C10 with a comp thumper cam and a holley 650 and it makes 411hp. That's the iron block aluminum headed engine.

I also got an all aluminum ls2 (aluminum block, aluminum heads) and it made 480hp bone stock with just some ignition tweaking. that's with a Demon 750 carb.

there are guys making 1000hp with the stock block and well over 2000hp turbo'd with the new lsx block.
 

·
Registered
Joined
·
3 Posts
As a work-around for the manifolds, I started looking into figuring out the port spacing of the LS series, and making up an adapter to run BBC or BBF logs/headers based on which one (BBC or BBF) is closest match to the LS port spacing. The internet is devoid of those kinds of data unfortunately.
Let me know what measurements you want/need. I've got a 5.3 sitting out on my back porch (still fully assembled mind you, dont feel like pulling heads or anything) waiting to be rebuilt for a truck project I have. There shouldnt be much difference (if any) between all of the different heads you can throw on these things.
 

·
Registered
Joined
·
201 Posts
just the basic port dimensions - center of port to center of next port, and locations of exhaust manifold bolt holes relative to the port center.

hell with the truck, you need to get that 5.3 in a boat and see how it rips. If that is a ~300 hp truck engine, its probably around 350 hp with no water pump, power steering, etc dragging it down.... all with stock truck cam.
 

·
mo balls than $cents$
Joined
·
11,734 Posts
ive done some dyno testing on ls1 and ls2 engines and they are pretty impressive.

I've got a 5.3L ls1 in my '73 Chevy C10 with a comp thumper cam and a holley 650 and it makes 411hp. That's the iron block aluminum headed engine.

I also got an all aluminum ls2 (aluminum block, aluminum heads) and it made 480hp bone stock with just some ignition tweaking. that's with a Demon 750 carb.

there are guys making 1000hp with the stock block and well over 2000hp turbo'd with the new lsx block.
i've got one my stand and the plans are down on paper for 20+psi of boost;) i'm done building bigblocks for myself, this blow thru carb stuff makes so much power soo cheap, you can build a pump gas ls sbc that'll eat up 80% of the boats having to run race gas on the lake:)grn:)devil that's my plan anyways:)hand soon as the nordic sells, i'm goin full tilt on it, just piece'n it together till then.
 

·
Registered
Joined
·
601 Posts
hell with the truck, you need to get that 5.3 in a boat and see how it rips. If that is a ~300 hp truck engine, its probably around 350 hp with no water pump, power steering, etc dragging it down.... all with stock truck cam.
that's a good idea Cyclone, you should do a motor swap and see how the boat runs
 

·
Banne'd
Joined
·
2,568 Posts
KEM Equipment has a blown 6.0. They have the center riser exhaust on it.


The Vortec 6.0 V8 marine engine features coil-near-plug
ignition system, with both crankshaft sensor, and camshaft
sensor. This is another example of GM Powertrain bringing
advanced automotive technology to the marine engine market.
Other features are hydraulic roller valve lifters, and crossbolted
main caps.

6.0 Supercharged Port Fuel Injected V8 504 HP



http://www.kemequipment.com/superchargedvortec6000.html


I'm sure they would sell the exhaust for a good price. And the intake with msd is about 700 bones from jegs. I've been looking into it as well. I found an article about the 6.0 being stroked to a 402 from the standard 366 ci. It put out 500 ponies on the dyno. That 100+ hp's over stock. Those engines will be dime a dozen. It might not be the best way to go for a jet, but it should kick some ass in a v-drive. I know the one in my 2500 will boogie right along.
 

·
Registered
Joined
·
3 Posts
just the basic port dimensions - center of port to center of next port, and locations of exhaust manifold bolt holes relative to the port center.

hell with the truck, you need to get that 5.3 in a boat and see how it rips. If that is a ~300 hp truck engine, its probably around 350 hp with no water pump, power steering, etc dragging it down.... all with stock truck cam.
Its a little dark outside, I'll do it tomorrow when I get off work.

And I debated puttin one in my boat, but I think I'll just freshen up the 460 thats in it and let it be... heh.
 

·
mo balls than $cents$
Joined
·
11,734 Posts
fyi guys, there's tons of stainless ls1 headers on ebay for less than 200 bucks delivered for long tube headers that are polished ss;) they're for firebirds and cameros
 

·
mo balls than $cents$
Joined
·
11,734 Posts
fyi guys, there's tons of stainless ls1 headers on ebay for less than 200 bucks delivered for long tube headers that are polished ss;) they're for firebirds and cameros
damn pc is jacking up:D meant to say you can take a set of those longtube headers from ebay, flip them over and thru them on the other side, have a cheap set of ss boat headers, and they wouldn't look bad:)bulb
 

·
Boss of the McIntyre Mob
Joined
·
1,981 Posts
Someone should hit up Redline or Turnkey, some of the buggy motor guys. I have seen diffrent intakes, carb/EFI combos in the buggys out at Glamis. Some CRAZY HP. I am sure they can make boat dry headers or O/T headers. I am sure lightining can make some jacketed headers and not breaking the bank.
 

·
Registered
Joined
·
230 Posts
I have been thinking about an LS boat motor for a while, it is a no-brainer from a weight and power standpoint. And its a no brainer from a cost standpoint if you run an iron block 6.0 from a truck (LQ4 or LQ9). These things are high RPM screamers, with no oiling problems or heavy bottom end problems (limiting RPM with stock parts) like typ old school big blocks. The main problem is manifolds/headers. Nobody makes or sells them cheap enough to justify the cost. Indmar makes some but they are way too much money, and I heard Indmar wont sell the manifolds by themselves to the public at any cost (they want you to pay them $5 million for a gay stock 300 hp EFI wake boat LQ4).

There are affordable stand alone spark controllers (msd and edelbrock) to fire the coil-on-plug, and carb manifolds to be able to run marine carb. I like efi but it would be too much hassle on a boat (IMO).

As a work-around for the manifolds, I started looking into figuring out the port spacing of the LS series, and making up an adapter to run BBC or BBF logs/headers based on which one (BBC or BBF) is closest match to the LS port spacing. The internet is devoid of those kinds of data unfortunately.

DO IT and post up the details.
Order a set of LS flanges from SPD Exhaust.
www.spdexhaust.com

Then you'll have a sample for dimensions, and you might be able to utilize them to build your adapters.
 

·
Registered
Joined
·
109 Posts
There are a few around. check out LS1Tech too. http://www.ls1tech.com/forums/conversions-hybrids/1132159-ls1-marine-use-connected-sterndrive.html looks like 351 ford manifolds have the same port spacing. I`m not sure about the PTO, some people have said you need a custom one made, and others said a SBC one will work. I know that the 2 piece rear main SBC one will not work, not sure about the newer 1 piece PTO`s though. You also may be able to get crusader exhaust manifolds if you know someone who can order from them http://www.ls1tech.com/forums/conversions-hybrids/337303-ls1-marine-exhaust-manifolds.html.

Stand alone electronics are available, or you can even adapt back to a front mounted distributor. If/when I do it though, I was planning on keeping the EFI:D. The LS series likes boost too so theres no reason not to turbo
 

·
Registered
Joined
·
418 Posts
Someone should hit up Redline or Turnkey, some of the buggy motor guys. I have seen diffrent intakes, carb/EFI combos in the buggys out at Glamis. Some CRAZY HP. I am sure they can make boat dry headers or O/T headers. I am sure lightining can make some jacketed headers and not breaking the bank.
Been done many times already......

Blown Turnkey LS7 780HP (boat now has lightning headers)



Think someone mentioned the LSA engine....(Kodiak, also blown/cooled and 545 hp)



And of course been a whack of Turnkey LS2's done, not to mention they are starting to race the LS3's This one's stroked 402" 580 HP



LS3 headers made from a kit...

 

·
mo balls than $cents$
Joined
·
11,734 Posts
here's some great info on ls motors!!! specs and everything you need to know bout the ls gen3 sbc's

http://www.theturboforums.com/smf/index.php?topic=122987.0;wap2



i picked up a new gmpp ignition and intake offa ebay this mornin for 485 delivered:)devil soooo my ignition system and intake is outta the way now for the turbo 5.3l:D the kit comes with the harness, msd box and carb'd single plane intake, here's some pics:

http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=260481120415&ssPageName=STRK:MEWNX:IT







i checked my cost on the stuff and it was well over 700bucks for it all at cost, retailed was over 850! ebay has a good deal ever now and then:D:)devil
 

Attachments

·
mo balls than $cents$
Joined
·
11,734 Posts
pretty badass ignition system:)devil

19171130 LSX Ignition Controller Kit
LSX Controller Kit
• Distributorless plug-in ignition system for carbureted LS engines with 58X reluctor wheel.
• Several pre-programmed timing curves provided.
• Supplied software allows you to create custom vacuum advance curves, timing curves, program lo and hi rpm rev limiter and step retard.
• Plugs into stock sensors (not provided).
• MAP sensor provided.
• Compatible with all LS series ignition coils.
Note: Solid core wires and non-resistor spark plugs cannot be used with this system.



i can retard timing under boost with it just like a boost timing master msd box too! will be nice to custom taylor my timing curve with a laptop:)devil
 
1 - 20 of 90 Posts
Top