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LS Engine Parts and Accessories

How-To-LS Swap a Marine application

Like many people, you have already come to recognize the dominance of the LS engine platform from all types of motorsports and powersports.

So imagine you were doing the same engine swap into a car, sand rail, air boat or virtually anything for that matter. What's more important than knowing what the engine needs is knowing what the boat needs from the engine to make it a compatible fit.

The first thing to ask yourself or the installer what does the car, boat or anything need or require to accept a new LS Based engine or retrofit. A marine application is no different what the engine needs is based entirely on what the engine is mating to. Below are a list of the most common questions to ponder before you start your project.

  1. What is the exact application and or drive type you're adapting to? Jet? Bravo? Alpha? #6 Sterndrive? V-Drive? Wakeboard boat configuration?
  2. What does the current engine have on it for accessories that the new engine will need? Will you want just a sea water cooling pump and will you fabricate your own accessories mounting and or drive ? Or do you want a complete kit?
  3. Is the engine Aluminum or Iron block? Are you going to want closed cooling?
  4. What style of motor mounts does your current engine use that you will have to adapt to?
  5. If you're adapting to a sterndrive application and you have an Alpha Outdrive you will need a modern Bravo bellhousing and LS Flywheel and coupler.
  6. Does your LS engine have a long or short crankshaft snout? This is critical in indentifying starters, flywheels, PTO, etc.
  7. Where does your current exhaust exit and can the new LS exhaust adapt to your current exit location? Will you want aluminum exhaust or Stainless steel headers?
  8. Does your engine use a carburetor or EFI? If EFI how many O2 sensors will you be using? one or two?

We have tried to address all of these but due to so many variables there is no such thing as a kit. There is no way to make one size shoe fit everyone basically. But we are here to support you through the journey. We've also partnered with Powerboat 1 to develop a technical advice video series on converting an LS Engine for use in a jet application. Check out the video series here!

Happy Boating!
Big Block Chevy Crossover Style Serpentine Drive Kit
Your Price:
$1,999.99

Billet-Track Serpentine Drive Kit for LS1, LS2, LS3, and LS6

625-8312

LS platform is rapidly being recognized by boaters around the world as the current and future platform for performance and reliability. Hardin Marine has always been at the forefront of engine development and the new Billet-Track LS accessory kit is just one more example.The perfect solution for mounting accessory components on the popular LS-1, LS-2, LS-3 and LS-6 used in engine swap applications.

The kit is engineered from 6061-T6 aluminum is precision CNC machined for strength and perfect fitment keeping a tight profile to the engine block. This all in one system kit includes a custom aluminum circulating pump, Billet crank pulley, Hardin Marine stainless steel water pump and billet pulley, power steering pump and billet pulley, High output 100amp alternator, Polished billet aluminum brackets and hardware, Stainless steel water inlet tube, and to keep it all spinning in style under constant tension a billet aluminum belt tensioner.

This system is sold without a closed cooling tank, however it MUST USE a closed cooled tank of some kind. This system in not designed for raw water cooling. System engineered to work with Fluidamper balancer #212-620121

  • 100 amp internal fan alternator
  • Billet polished aluminum alternator pulley
  • Natural finish custom aluminum LS circulating water pump
  • Billet Polished aluminum circulating water pump pulley
  • Billet Polished aluminum accessory bracket
  • Billet Polished aluminum Serpentine belt tensioner 
  • Billet Polished aluminum tensioner pulley
  • Billet Polished aluminum crankshaft pulley
  • Goodyear Gatorback serpentine belt

Big Block Chevy Crossover Style Serpentine Drive Kit
Your Price:
$3,599.99

Billet-Track Serpentine Drive Kit with Closed Cooling for LS1, LS2, LS3, and LS6

625-8313

LS platform is rapidly being recognized by boaters around the world as the current and future platform for performance and reliability. Hardin Marine has always been at the forefront of engine development and the new Billet-Track LS accessory kit is just one more example.The perfect solution for mounting accessory components on the popular LS-1, LS-2, LS-3 and LS-6 used in engine swap applications.

The kit is engineered from 6061-T6 aluminum is precision CNC machined for strength and perfect fitment keeping a tight profile to the engine block. This all in one system kit includes a custom aluminum circulating pump, Billet crank pulley, Hardin Marine stainless steel water pump and billet pulley, power steering pump and billet pulley, High output 100amp alternator, Polished billet aluminum brackets and hardware, Stainless steel water inlet tube, and to keep it all spinning in style under constant tension a billet aluminum belt tensioner.

This  system has an included closed cooling tank that MUST BE USED. This system in not designed for raw water cooling. System engineered to work with Fluidamper balancer #212-620121

  • 100 amp internal fan alternator
  • Billet polished aluminum alternator pulley
  • Natural finish custom aluminum LS circulating water pump
  • Billet Polished aluminum circulating water pump pulley
  • Billet Polished aluminum accessory bracket
  • Billet Polished aluminum Serpentine belt tensioner 
  • Billet Polished aluminum tensioner pulley
  • Billet Polished aluminum crankshaft pulley
  • Goodyear Gatorback serpentine belt
  • Polished Stainless Steel water inlet tube

GM LS Series Remote Side Mount Thermostat Oil Filter Adapter
Your Price:
$206.99

GM LS Series Remote Side Mount Thermostat Oil Filter Adapter

625-4526

GM LS Series Remote Side Mount Oil Filter Adapter

Earl's billet side mount oil cooler adapters are the slick way to add an oil cooler to your GM LS or Gen-V LT engine. The slim design of these adapters clear most headers and other components and feature -10 AN male connections. These adapters are black anodized and use O-Ring seals for a leak free installation. Fits OEM & Holley Wet Sump oil pans only (Does not Fit Dry Sump Engines).

  • Billet Aluminum w/ Black Anodized Finish
  • Includes 0-Ring Seal & Hardware
  • (2) 1/8” NPT Accessory Ports
  • -10 AN Male Connections
  • Available w/ 180 Degree Thermostat
  • Add an Earl’s Oil Cooler and AN Plumbing to Complete the Installation

GM LS Series, Rear Sump Swap Oil Pan
Starting From:
$679.99

This Part has options, please click the button below to order.

GM LS Series, 10 Quart Marine Oil Pan

280-01-80 + Option(s)

GM LS Series, 10 Quart Oil Pan for Inboard, Jet or V-Drive

  • 10 Quart Capacity
  • Oil Pump Pickup included
  • Jet/Inboard and V-Drive Models are similar, but have components adjusted for engine orientation.
  • Pans are Gold colored (see installed images showing gold pan). Because the coating on gold pans takes some time to finish sometimes the Black painted pan shown is made if the customer needs one ASAP and gold ones are between production batches.
  • 5-1/4" Deep, 8-1/4" Wide, 19-1/2" Long.
  • Fits stock cranks only, does not fit stroker cranks.

LS1 14mm PTO 1310 Adapter Bolt Kit
Your Price:
$79.99

LS PTO 1310 Adapter Long Bolt Kit

500-2160

LS PTO 1310 Adapter Bolt Kit

This is a special metric long bolt kit for 1310 LS PTO's. See additional info below for fitment.

Contains (6) M11x1.5x44 Bolts and (4) 3/8"-24 x 1" bolts


LS1 14mm PTO 1310 Adapter Bolt Kit
Your Price:
$79.99

LS PTO 1350 Adapter Long Bolt Kit

500-2162

LS PTO 1350 Adapter Bolt Kit

This is a special metric long bolt kit for 1350 LS PTO's. See additional info below for fitment.

Contains (6) M11x1.5x44 Bolts and (4) 7/16" x 1" bolts


LS Crossover and Thermostat
Your Price:
$179.99

LS Steam Tube Kit w/ Stainless Steel Hard Line Tubing

625-4520

LS Steam Tube Kit w/ Stainless Steel Hard Line Tubing

Earl's hard line steam tube kit is designed to eliminate trapped air and steam from your engine to prevent hot spots & overheating. Easy bolt-on installation when used with Earl's pivoting steam vent adapters - part # LS9807ERL (2 sets required). Made from attractive stainless steel tubing & black anodized components.

This steam tube kit works w/ the Holley LS Hi-Ram, Holley Single Plane, and Sniper Fabricated Intake Manifolds for the GM LS Engine.

Features:

  • Steam Tube Kit Eliminates Trapped Air and Steam from Your Engine to Prevent Hot Spots & Overheating
  • Custom Look That is More Attractive than Original Equipment (OE) Hard Lines
  • Use w/ Adjustable Pivoting Steam Vent Adapters for Easy Installation
  • Four Corner Style - Allows Flow of Steam & Coolant from Front & Back of Cylinder Heads
  • Made from Stainless Steel Tubing & Black Anodized Aluminum Components – for Corrosion Protection & a Great Look
  • Outlet Size - Use w/ 1/4" Hose

LS Crossover and Thermostat
Your Price:
$539.99

Water Inlet Crossover Kit for GM LS Engines

625-4525

Water Inlet Crossover Kit for GM LS Engines

These new adapters and crossover tubes allow easy installation of a remote mounted electric water pump on the GM LS engine. These billet aluminum block adapters feature (4) -12 AN O-ring female ports for routing water to a remote mounted electric water pump. The 1/8" NPT Port can be used to connect to the steam tube plumbing.


Cyclone Header System For GM Big Block Standard Dimension Bravo
Your Price:
$3,999.99

Cyclone Header System For GM LS Standard Bravo Tailpipes

620-32570

Cyclone Water Jacketed Header System For GM LS and Standard Dimension Bravo - Fully Polished - Pair of Headers for one engine.

This new cyclone header system is designed specifically for GM LS engines. The tailpipes are set up for standard Bravo exit locations.

This Cyclone wet exhaust series header works perfectly on both stock and modified performance applications This header mixes engine cooling water with the exhaust near the end of the tailpipe That allows you to use a 4" rubber hose connection to attach your transom mounted exhaust tips This is the perfect replacement for your factory exhaust system.  Gaskets, and bolts included.

If you are one of thousands of performance boaters oseeking the power and styling from stainless steel tubular headers then you're looking at the leader in exhaust technology These "Cyclone" header systems share 100% 316L stainless steel construction. All appropriate flanges are laser cut and CNC machined for a perfect gasket seal. Each individual exhaust tube is bent to precise, exact tolerances every time. A computer designed fully welded water inlet manifold provides equal water distribution to each exhaust runner tube. While each set of headers goes through a 1900 degree annealing process that multiplies the durability factor of the header many times over while providing added protection against corrosion. But the heart of these systems lies in the ability to generate loads of additional power. By using CAD-5 Technology to develop a unique staggered tube runner length, these systems are capable of maximizing the broadest low end and midrange torque, all the while yielding incredible peak power gains. These systems are available in many configurations to fit every boaters needs. Rest assured when you lay down your hard earned money because the system comes complete with all necessary mounting bolts, gaskets, and shift and oil filter brackets making installation a snap. This kit includes one (1) O2 bung standard, if you need a 2nd O2 bung on your kit, see related parts below.

Additional Information:


Cyclone Header System For GM Big Block Standard Dimension Bravo
Your Price:
$4,199.99

Cyclone Header System For GM LS with Turbo Adapter Flange

620-32560

Cyclone Water Jacketed Header System For GM LS with Turbo Adapter Flange  - Fully Polished - Pair of Headers for one engine.

This new cyclone header system is designed specifically for GM LS engines. The header has an adapter flange set up to easily adapt a turbo for use with the system.

This Cyclone wet exhaust series header works perfectly on both stock and modified performance applications This header mixes engine cooling water with the exhaust near the end of the tailpipe That allows you to use a 4" rubber hose connection to attach your transom mounted exhaust tips This is the perfect replacement for your factory exhaust system. Gaskets, and bolts included.

If you are one of thousands of performance boaters seeking the power and styling from stainless steel tubular headers then you're looking at the leader in exhaust technology These "Cyclone" header systems share 100% 316L stainless steel construction. All appropriate flanges are laser cut and CNC machined for a perfect gasket seal. Each individual exhaust tube is bent to precise, exact tolerances every time. A computer designed fully welded water inlet manifold provides equal water distribution to each exhaust runner tube. While each set of headers goes through a 1900 degree annealing process that multiplies the durability factor of the header many times over while providing added protection against corrosion. But the heart of these systems lies in the ability to generate loads of additional power. By using CAD-5 Technology to develop a unique staggered tube runner length, these systems are capable of maximizing the broadest low end and midrange torque, all the while yielding incredible peak power gains. These systems are available in many configurations to fit every boaters needs. Rest assured when you lay down your hard earned money because the system comes complete with all necessary mounting bolts, gaskets, and shift and oil filter brackets making installation a snap.

Additional Information:


Custom Lightning Exhaust Headers for LS Applications (Quote Only)

Starting From:
$0.00

This Part has options, please click the button below to order.

Custom Lightning Exhaust Headers for LS Applications (Quote Only)

310-Headers-LS + Option(s)

NOTE: Custom Lightning Headers are now built to order by quote only. Please select your options below and we will have a price and turn around time quoted to you as soon possible. Please make sure your contact information (e-mail address and phone number) are correct when placing an order for a quote. 

All orders of Lightning Headers will require you to provide measurements, see these diagrams:

Lightning Jet Headers
Lightning Mercury Headers
Lightning Generic Headers

Please select all the options below you wish to have on your headers. By ordering this item you are asking for a quote only. 

NOTE: LIGHTNING HEADERS HAVE A 4-6 WEEKS BUILD TIME.


Powerflow Small Block Kit with Stainless Risers
Your Price:
$2,799.99

This Part has options, please click the button below to order.

Powerflow Black LS Small Block Kit with Stainless Risers

421-8382

Powerflow LS Small Block Kit with Black Risers

Powerflow now offers a small block system. This system is designed after the big block kit using the same riser system. This system will increase your torque and horsepower by 10%. This kit is powdercoated black.

Powerflow manifolds are manufactured using the finest materials and most advanced techniques available. The high quality aluminum manifold castings feature water jackets that surround each exhaust passage, including the port, to eliminate the possibility of burn out. Features an external fitting to accept stock MerCruiser thermostat plumbing.


Powerflow Small Block Kit with Stainless Risers
Your Price:
$2,699.99

Powerflow Polished LS Small Block Kit with Stainless Risers

421-8384

Powerflow LS Small Block Kit with Stainless Risers

Powerflow now offers a small block system. This system is designed after the big block kit using the same riser system. This system will increase your torque and horsepower by 10%. This is fully polished, too.

Powerflow manifolds are manufactured using the finest materials and most advanced techniques available. The high quality aluminum manifold castings feature water jackets that surround each exhaust passage, including the port, to eliminate the possibility of burn out. Features an external fitting to accept stock MerCruiser thermostat plumbing.


LS1 Small Block Chevy Exhaust System
Your Price:
$1,599.99

LS-M Marine Aluminum Exhaust Manifold System for GM 4.8, 5.3, 6.0, 6.2

620-32950

LS-M Marine Aluminum Exhaust Manifold system for GM LS BASED 4.8, 5.3, 6.0, 6.2

These Next generation NEW LS-M series Aluminum exhaust manifold system is a perfect complement to OEM GM LS based engine platforms up to the GM LSA of 550HP. The New :LS-M Series Manifolds feature DUAL O2 sensor bung provisions mounted sleekly in each exhaust riser. The LS-M series exhaust system also features the ability to be plumbed for either fresh water or closed cooling options. 4" exhaust hose connection is standard. Yet another new feature of the LS-M manifolds is their corrosive hard anodizing feature to yet extend longevity in harsh environments. These manifolds were developed on OEM performance engines and are NOT for use with engines using a camshaft with more than .226 @ .050 Camshaft Duration.

ATTENTION** This Exhaust System is sold in a Painted Industrial finish. Installers will be required to apply further extensive aesthetic final detail finishing. The outside is ROUGH machine and sanded aluminum with Industrial grade painting. Additional Sanding, Polishing, Powder coating or Painting is the responsibility of the purchaser!


LS1 Small Block Chevy Exhaust System
Your Price:
$200.00

Extra O2 Bung for LS Marine Aluminum Exhaust Manifold System

620-32941

Extra O2 Bung for LS Marine Aluminum Exhaust Manifold System

The 620-32940 Exhaust System comes with a single O2 Bung, however some systems require a 2nd O2 bung. Order this part alongside a 620-32940 system to have two O2 bungs.


LS1 Small Block Chevy Exhaust System
Your Price:
$59.99

ECM Bracket for LS Marine Aluminum Exhaust Manifold System

620-32492

ECM Bracket for LS Marine Aluminum Exhaust Manifold System

Add an ECM bracket to the 620-32940 or 620-32942 LS Exhaust Systems or IMCO LS Exhaust Systems.


LS1 Small Block Chevy Exhaust System
Your Price:
$59.99

Shift Bracket for LS Marine Aluminum Exhaust Manifold System

620-32490

Shift Bracket for LS Marine Aluminum Exhaust Manifold System

Add a shift bracket to the 620-32940 or 620-32942 LS Exhaust Systems or IMCO LS Exhaust Systems.

NOTE: If using with a riser mounted O2 Sensor, modification to bracket will be required or O2 sensor moved inboard.


LS1 Small Block Chevy Exhaust System
Your Price:
$10.99

Riser Gasket for LS Marine Aluminum Exhaust Manifold System

620-32494

Replacement Riser Gasket for LS Marine Aluminum Exhaust Manifold System

Replacement Riser Gasket for the 620-32940 or 620-32942 LS Exhaust Systems or IMCO LS Exhaust Systems.


LS1 Small Block Chevy Exhaust System
Your Price:
$29.99

Exhaust Gaskets for LS Marine Aluminum Exhaust Manifold System

620-32496

Exhaust Gaskets for LS Marine Aluminum Exhaust Manifold System

Replacement Exhaust Gaskets for the 620-32940 or 620-32942 LS Exhaust Systems or IMCO LS Exhaust Systems. Sold in pairs for one engine.


LS1 Small Block Chevy Exhaust System
Your Price:
$1,375.99

Stainless Risers for LS Marine Aluminum Exhaust Manifold System

620-32938

Stainless Steel Risers for LS Marine Aluminum Exhaust Manifold System

Change out the cast aluminum risers on the 620-32940 or 620-32942 LS Exhaust Systems for Stainless Steel ones! Sold in pairs.