See us on:
Visit CP on Facebook Visit CP on Twitter Visit CP on YouTube
Is your boat in the gallery?
Image Gallery  
Instructions & Guides:
Instructions  
Find Parts by Mercury Model:
OEM Part Finder  
What's on sale today?
Sale Specials  
What are you looking for Today?

Need Help? Call Us:

1-800-225-9871

Outside the USA? Call 707-585-9871

LS Engine Parts and Accessories

LS1 PTO 1350 Adapter Bolt kit
Your Price:
$44.99

LS1 PTO 1350 Adapter Bolt kit

500-2158

LS1 PTO 1350 Adapter Bolt kit


Rockwell 1-Piece H-Bar Driveline Spacer
Your Price:
$25.00

Rockwell 1-Piece H-Bar Driveline Spacer

500-1999

Rockwell 1-Piece H-Bar Drive line Spacer

This spacer is designed to be used with old Rockwell 1-Piece H-bar assemblies. This spacer will prevent you from needing to relocate and position your engine.


Typhoon "LS" Small Block Chevy Headers, Polished
Your Price:
$4,299.99

Typhoon "LS" Small Block Chevy Headers, Polished

620-37001

Typhoon "LS" Small Block Chevy Headers, Polished, Pair (Headers Only, No Tailpipes)

Once again Hardin Marine leads the way with another "NEW" exhaust innovation.Are you are one of the many powerboaters acknowledging the amazing output of GeneralMotors latest new generation GM LS1/LS2/LS3/LS6/ and LS7 engine family? GM has shown the power potential of the engines exceeding 600HP right out of the crate.Aftermarket builders have these engines wringing out power levels double that. Until now true long tube performance marine headers were not readily available forsmall block Chevy applications, but those days are over.  Hardin Marine welcomes this application into its already successful "Typhoon" series headers.

  • True long-tube design to maximize performance potential of the engine.
  • 316L Stainless steel heavy wall tubing and flanges provide durability and a leak-proof seal at cylinder heads.
  • Designed to be compatible with other popular aftermarket components for this application.
  • Available in production and custom versions.
  • 34" Width
Shown with optional tailpipe.

Lightning Exhaust Headers for LS Applications (Quote Only)

Starting From:
$0.00

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

Lightning Exhaust Headers for LS Applications (Quote Only)

310-Headers-LS + Option(s)

NOTE: All 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. 

FREE GROUND SHIPPING TO THE LOWER 48 UNITED STATES!


LS1 Small Block Chevy Exhaust System
Your Price:
$1,499.99

GM LS Exhaust Manifold 4.8, 5.3, 6.0, 6.2, 7.0L Aluminum 4" Exhaust System

620-32950

GM LS Exhaust Manifold 4.8, 5.3, 6.0, 6.2, 7.0L Aluminum 4" Exhaust System

These exhaust systems allow center to center engine dimensions of 32-5/16"and are 4-9/16 taller than Mercury cast iron manifolds mounted on stockshort decks with GM Heads.

Now available, this cast aluminum exhaust system is the perfect fit for you LS1 small block! Uses a standard 4" hose connection. Painted Black.

Note: these are sold as a pair.


Big Block Chevy Closed Cooling Kit Up To 650HP
Your Price:
$1,599.99

LS1, LS2, LS3 and LS6 Closed Cooling Kit - Copper / Brass

625-4574

LS1, LS2, LS3 and LS6 Closed Cooling Kit - Copper / Brass

While there are numerous universal OEM closed cooling kits, this is not one of those. This is a true custom engineered and developed closed cooling system designed around new LS1, LS2, LS3 and LS6 applications. The kit is perfect for engines making up to 650 horsepower.

We offer the closed cooling tank version in a paint-to-finish version and an upgraded polished stainless steel/Cupronickel core version for the ultimate in appearance and durability. This High Performance Closed Cooling kit is designed for applications with horsepower levels to 650HP. Also available in polished Stainless Steel as special order, contact us for details.

The Kit comes with: Tank, Brackets, Hoses, and Thermostat Housing.


LS Sea Pump Assembly
Your Price:
$849.99

GM LS Series Engine Sea Water Pump

625-4116

Hardin Marine is the first to bring a engine specific sea water pump for the popular LS series of engines. This unit was designed around the 5.3 ,6.0, and 6.2 liter generation engine platforms. The pump uses Hardin Marine's Extreme Lifetime Series stainless steel impeller housing as well as a proprietary short body construction that allows the necessary access or clearance for the engines factory engine mounting pads when the pump is installed. The pump is designed to mount to the engine blocks factory A/C mounting bosses while positioning the billet aluminum serpentine pulley in line with OEM crankshaft pulley. The billet mounting bracket provides the two necessary idlers that allow this pump to be incorporated into most factory automotive serpentine accessory drive systems. The Sea pump features female 1" NPT inlet and outlet ports for ease of plumbing convenience.

Note: Fits OEM GM LS Corvette / CTS-V / G8 automotive balancer spacing with 1-1/2" offset (NOT Truck or F-Body balancer)

High Performance 1.4KW LS marine starter
Your Price:
$269.99

High Performance LS Marine Starter

620-3121

This is a "TRUE" High Performance 1.4KW LS marine starter designed for use on late model GM LS Chevrolet marine engine application including 4.8,5.3,6.0,6.2, and 7.0 Litre versions. The application has a slight off-set and uses the OE bolts for installation and features Genuine precision N.D starter motor coupled to patented design billet mount.

Technical specs:
  • Rotation CW
  • kW 1.4
  • Gearing 4.44 to 1
  • Rotatable Yes
  • Voltage 12v

USCG Approved (SAE J1171)


Holley LS Hi-Ram EFI Manifold
Your Price:
$749.99

Holley LS Hi-Ram EFI Manifold

710-300-124

Holley LS Hi-Ram EFI Manifold

  • Runner Length – 6.29”, As-Cast Runner Cross-Sectional Area – Tapered 4.67in² to 2.84 in²
  • Throttle Body Flange Location, with 92/102mm EFI Plenum Top : Height – 8.42” (from engine block lifter valley cover flange), Longitudinal Location – 3.84” (forward from engine block front flange), Angle – 25 deg. (down from vertical)
  • Plenum Top Gasket Type – 3/32” Round O-ring Cord
  • Mounting Flange Gasket Type – Standard LS3 Molded O-Ring
  • Port Size – 2.49” Height x 1.21” Wide
  • Total Height with 92/102mm EFI Plenum Top – 12.32” to the lifter valley cover flange on engine block.
  • Base Plenum Top Mounting Flange Height – 8.42” to the lifter valley cover flange on engine block.
These parts should be used for the following applications: Racing/Performance/Street Rodder where hood restrictions are NOT a consideration. Top can be mounted forward or backward. Holley EFI LS main harnesses have a map sensor connecter designed for use with an LS1/2 style map sensor. The 558-416 is an adapter harness that can be used to adapt any LS harness that uses a LS1/2 MAP sensor connection to a LS3 MAP, which is recommended for this manifold.

GM LS Series, Rear Sump Swap Oil Pan
Your Price:
$314.99

GM LS Series, Rear Sump Swap Oil Pan

740-20145

GM LS Series, Rear Sump Swap Oil Pan

Wet Sump, 5 Quart Capacity, 5'5" Deep, 8.5" Wide, 8.375" Long
Engine Application: GM LS Series
Fits: LS Engine Conversions that require a Rear Sump

  • Oil pan has a thick precision laser cut steel rail with a durable fabricated steel sump plated with a clear zinc finish
  • Fabricated, durable steel construction is more adaptable to add fittings, change finishes and weighs les than cast aluminum construction.
  • Clears 4.25" stroke with most steel rods
  • Front of the oil pan is 1.813" Deep to the beginning of the 5.5" deep sump.
  • The fabricated steel sump is 5.5" Deep, 8.5" Wide, and 8.375" Long
  • Removable anti-slosh baffle
  • Features a billet aluminum adapter that allows a 13/16" thread Moroso or OEM oil filter to be mounted in the stock location, no need to run a remote oil filter.
  • Designed to be used with Moroso 740-24050 Oil Pump Pickup
  • Magnetic drain plug and uses a stock dipstick

GM LS Series Remote Oil Filter Adapter
Your Price:
$92.99

GM LS Series Remote Oil Filter Adapter

740-23688

GM LS Series Remote Oil Filter Adapter

  • Replaces Moroso Spin-On oil filter adapter on Moroso #'s 20142, 20143 & 20151 oil pans, comes standard on Moroso # 20146 oil pan.
  • Ideal when chasis restrictions don't allow the use of block mounted filter or when a larger external filter is desires.
  • Billet aluminum construction
  • -10 AN "In" and "Out" ports
  • Includes mounting hardware and engine block sealing O-Rings

Billet Aluminum Front Single Engine Mount
Your Price:
$529.99

Billet Aluminum Front Single Engine Mount for LS Motors

625-8529

In the world of professional offshore powerboat racing the top teams are always looking for ways to save weight without sacrificing performance and durability Hardin Marine knows there is no better way to test a product than to expose it to the abuses and demands of full blown racing While tested in extreme conditions these mounts are still right at home in a recreational pleasure boat. 

While bearing the same nominal measurements as the factory Mercury Racing engine mounts that’s where the similarities end. These engine mounts are CNC machined from aero space grade  6061-T6 billet aluminum. Front mounts feature our exclusive billet engine block mounting pads. These pads form a structural bridge like connection to the base of the engine mount. They also provide for an optional speedy engine removal option while the base mount stays in the boat.Next the mounts are machined to accept precision stainless steel bushings in the mounting hole locations to ensure a secure fit and prevent premature wear. After construction of the mounts they are then black hard coat anodized for corrosion resistance and long life.

So if your looking for the strongest and lightest engine mount option (half the weight of conventional steel mounts) then there is no better choice than these mounts.  Available in 4 configurations, the shipping mounts are commonly used in catamaran hulls, while the staggered or side by side mounts are perfect for vee bottom installations.  

Power Take Off Adapter - LS1 Chevy 1310 Flexplate
Your Price:
$109.99

Power Take Off Adapter - LS1 Chevy 1310 Flexplate

500-2000

Power Take Off Adapter - LS1 Chevy 1310 Flexplate

Uses 3/8-24 bolts on 2" x 2-3/8" centers

These flanges bolt on the flywheel or flexplate and accept 1310 spicer drivelines.  There are many more available, just call us. These power take offs are needed when attaching your drive shaft to your engine.


Power Take Off Adapter - LS1 Chevy 1310 Flywheel
Your Price:
$109.99

Power Take Off Adapter - LS1 Chevy 1310 Flywheel

500-2005

Power Take Off Adapter - LS1 Chevy 1310 Flywheel

Uses 3/8-24 bolts on 2" x 2-3/8" centers

These flanges bolt on the flywheel or flexplate and accept 1310 spicer drivelines.  There are many more available, just call us. These power take offs are needed when attaching your drive shaft to your engine.


Power Take Off Adapter - LS1 Chevy 1350 Flexplate
Your Price:
$113.99

Power Take Off Adapter - LS1 Chevy 1350 Flexplate

500-2010

Power Take Off Adapter - LS1 Chevy 1350 Flexplate

Uses 7/16-20 bolts on 2-3/8" x 2-7/8" centers

These flanges bolt on the flywheel or flexplate and accept 1350 spicer drivelines.  There are many more available, just call us. These power take offs are needed when attaching your drive shaft to your engine.


Power Take Off Adapter - LS1 Chevy 1350 Flywheel
Your Price:
$109.99

Power Take Off Adapter - LS1 Chevy 1350 Flywheel

500-2015

Power Take Off Adapter - LS1 Chevy 1350 Flywheel

Uses 7/16-20 bolts on 2-3/8" x 2-7/8" centers

These flanges bolt on the flywheel or flexplate and accept 1350 spicer drivelines.  There are many more available, just call us. These power take offs are needed when attaching your drive shaft to your engine.


LS1 14mm PTO 1310 Adapter Bolt Kit
Your Price:
$44.99

LS1 PTO 1310 Adapter Bolt Kit

500-2156

LS1 PTO 1310 Adapter Bolt Kit

This is a special metric bolt kit for 1310 LS1 PTO's

Head Studs w/12-Point Nuts, SB Chevy LS1, LS6 5.7L/6.0L, 2004 Engines
Your Price:
$346.99

Head Studs w/12-Point Nuts, SB Chevy LS1, LS6 5.7L/6.0L, 2004 Engines

860-234-4317

Head Studs w/12-Point Nuts, SB Chevy LS1, LS6 5.7L/6.0L, 2004 Engines

Exact Tolerances for Perfect Alignment
Exact tolerances ensure that gaskets and cylinder heads just glide into position and align perfectly. Head Studs include hex nuts and are manufactured by from premium 8740 chrome moly steel and heat treated to 190,000 psi. They are thread rolled after the heat treating process, which vastly improves their fatigue tolerance compared to studs threaded before heat treatment. High-quality, parallel ground washers included.


Head Studs w/12-Point Nuts, SB ChevyLS1, LS6 5.7L/6.0L
Your Price:
$391.99

Head Studs w/12-Point Nuts, SB ChevyLS1, LS6 5.7L/6.0L

860-234-4316

Head Studs w/12-Point Nuts, SB ChevyLS1, LS6 5.7L/6.0L

Exact Tolerances for Perfect Alignment
Exact tolerances ensure that gaskets and cylinder heads just glide into position and align perfectly. Head Studs include hex nuts and are manufactured by from premium 8740 chrome moly steel and heat treated to 190,000 psi. They are thread rolled after the heat treating process, which vastly improves their fatigue tolerance compared to studs threaded before heat treatment. High-quality, parallel ground washers included.


Hi-Performance Head Bolt Kit, SBC Gen III/LS Series (2003 & Earlier)
Your Price:
$199.99

Hi-Performance Head Bolt Kit, SBC Gen III/LS Series (2003 & Earlier)

860-134-3609

Hi-Performance Head Bolt Kit, SBC Gen III/LS Series (2003 & Earlier) Hex Head

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 170,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.