540-222132 Cast 316L Stainless Steel Fitting, Short
3/4" NPT To 1" Straight
We Offer the most complete line of chrome plated brass and custom fabricated stainless steel fittings available anywhere. All of these fittings are sure to simplify your plumbing job and add a tasteful finishing touch. This is shorter than the normal 540-222110 fitting for a more compact installation. Used on Seaward manifolds.
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620-38031 This kit contains the fittings and bolts to install a pair of manifolds on a small block Chevy Seaward exhaust system.
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620-38032 This kit contains the fittings and bolts to install a pair of manifolds on a big block Chevy Seaward exhaust system.
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620-38046 This kit contains the gaskets, hoses and bolts to install a pair of risers on a small block Chevy Seaward exhaust system.
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620-38036 This kit contains the gaskets, hoses and bolts to install a pair of risers on a big block Chevy Seaward exhaust system.
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620-38071 This kit contains the fittings and bolts to install a pair of risers on a 8.1L / 496 Mercrusier Seaward exhaust system.
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300-1413 Extreme Duty Hi-Performance Seaward / Cyclone Exhaust Manifold Gaskets - Stock Square Port 454/502/525 Chevy - Sold in Pairs
These gaskets are graphite impregnated and designed to withstand the highest
of temperatures on high horsepower applications. Double drilled for both standard BBC and 525 applications. These gaskets are designed to be used with Hardin Marine's Seaward / Cyclone Exhaust Manifolds. Will work on other Big Block Chevy Manifolds as well.
Sold in Pairs
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300-1417 Extreme Duty Hi-Performance D Port Exhaust Manifold Gaskets - 454/502/8.2L Chevy - Sold in Pairs - Replaces OEM Mercury #27-8M0065690
These gaskets are graphite impregnated and designed to withstand the highest of temperatures on high horsepower applications. For those of you looking to do the job only once, insist on Hardin Marine Extreme Duty gaskets. Quite possibly the last gasket you'll ever need. These gaskets are designed to be used in D port Exhaust applications. Replaces stock OEM Mercury #27-8M0065690
Sold in Pairs
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620-38006 Replacement riser gasket for Hardin Seaward manifolds and risers. 4-1/2" x 3" Bolt pattern.
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620-38089 Seaward Turbulator
Designed for seaward series exhaust systems.
Turbulators are designed to keep any condensation or moisture from entering the manifold during the cool down process This is one of the many unique Hardin features that are helping lead the way in exhaust system technologies. Sold each, gaskets sold separately. 2 gaskets are needed per 1 turbulator.
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650-28235P Shift Bracket for CMI Gen-X and Hardin Hurricane, Seaward 525 / 700 Exhaust
This is a bracket only for installing yourself on compatible headers.
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620-38051 This Shift / EFI bracket fits Hardin Marine Seaward Series Exhaust Systems. Can be used for either application.
NOTE: If using with a riser mounted O2 Sensor, modification to bracket will be required or O2 sensor moved inboard.
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620-38050 This oil filter bracket fits Hardin Marine Seaward Series Exhaust Systems.
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620-38080 Whether you're a tuner seeking to add a popular Air/Fuel ratio gauge or you're entering the world of aftermarket fuel injection we have developed the critical part to make this addition a snap. This billet aluminum anodized wedge is at just the perfect angle to allow re-connection of your original exhaust hose. The kit includes (1) O2 adapter wedge, (2) gaskets, and (2) new front attachment studs. Bolt pattern is 3" x 4.5". Designed to fit the Hardin Marine Seaward Manifolds only.
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620-38081 + Option(s) Seaward O2 Wedge / Gauge Kit
- Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU 4.9 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
- 0-5v data and serial data outputs for ECU, data acquisition unit, or Laptop tuning
- User programmable range for Rich/Stoic/Lean conditions
- Peak recall/memory
- 10:1 to 20:1 AFR range for gasoline applications
- 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system
- User Programmable Warning Function
- Display data in Lambda or numerical A/F ratio
Whether you're a tuner seeking to add a popular Air/Fuel ratio gauge or you're entering the world of aftermarket fuel injection we have developed the critical part to make this addition a snap. This billet aluminum anodized wedge is at just the perfect angle to allow re-connection of your original exhaust hose. The kit includes (1) O2 adapter wedge, (1) gasket, and (2) new front attachment studs.
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620-50031 Stainless Steel 18MM Oxygen Sensor Plug
This plug only is designed fit popular O2 bungs and ports designed to allow you to cap/plug a oxygen sensor bung Price does not include bung only plug. Sold Each. 18mm x 1.5
Note: This is a plug only
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620-50033 Stainless Steel 18MM Oxygen Sensor Plug - Hex Head
This plug only is designed fit popular O2 bungs and ports designed to allow you to cap/plug a oxygen sensor bung Price does not include bung only plug. Sold Each. 18mm x 1.5, Hex Head.
Note: This is a plug only
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This Part has options, please click the button below to order.
625-4289 ***WARNING**** Do not fall victim to the failure of the OEM blue plastic drain plugs. The factory cheap plugs crack, break off and create service to nightmares to actual water leaks into your boat. Hardin Marine has designed the "Lifetime Series" drain plugs to perfectly blend with their award winning lifetime series sea pumps. Whether your replacing your sea pump or merely servicing your boat you cannot afford to not update to the simple to install safer drain plugs. these replacements for Mercruiser #22-806608A02 / 8M2000874 from Hardin Marine are polished Stainless Steel and will last a lifetime!
The thread on this plug is 1/2-13
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620-32943 Open Sealing Tube for LS Exhaust Manifolds.
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620-32947 Closed Sealing Tube for LS Exhaust Manifolds. Used in Closed Cooling applications.
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