 
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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620-38051 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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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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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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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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620-50031 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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This Part has options, please click the button below to order.
620-38125 This add-on anti-corrosion kit fits Hardin Marine Seaward Series Exhaust Systems or any other aluminum manifold with a 3/4" NPT port.
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620-38127 Add an inlet with a drain provison with this fitting. Fits 3/4" NPT port. 1" Hose barb. See related parts for drain plug sold separately. GLM 13991, Mercruiser 22-862210A01.
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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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