GAPerformance
Billet -10an Heater Core Adapter (90-Degree Low-Profile)
Billet -10an Heater Core Adapter (90-Degree Low-Profile)
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Need fitment help? Contact GAPerformance with your vehicle year, engine, and setup.
Why is a heater core restrictor important?
A heater core needs controlled coolant flow. Excessive flow can contribute to erosion and leaks in the core or its inlet and outlet connections. A correctly sized restrictor limits flow through the heater circuit, helping protect the heater core while still allowing coolant to circulate for cabin heat.
This matters when replacing factory heater hoses with custom AN lines: an original hose or fitting may contain a restrictor that is lost during the conversion. Larger lines do not automatically mean the heater core should receive unrestricted flow.
Which configuration should I choose?
- Built-in restrictor: choose this when your heater circuit requires a restrictor and you need to replace that function in your custom plumbing.
- No restrictor: choose this when the correct restriction is already provided elsewhere, or your verified cooling-system design calls for an unrestricted connection.
Confirm the required restriction and installation location for your engine and heater circuit. Avoid adding a second restrictor without checking the existing setup; too little flow can reduce cabin heat. Contact GAPerformance if you need help choosing.
The GAPerformance low-profile 90-degree heater core adapter converts a 5/8-inch heater core barb connection to -10AN for custom heater hose routing. Its compact elbow design helps route the connection where engine bay clearance is limited.
Key features
- Machined from 6061 billet aluminum.
- Converts a 5/8-inch heater core barb connection to -10AN.
- Low-profile 90-degree design for tight spaces.
- Available individually or as a set of two, with restrictor configurations listed below.
Choose your configuration
- Single, no restrictor: one adapter without a restrictor.
- Single, built-in restrictor: one adapter with a built-in restrictor.
- Set of two, no restrictors: two adapters, both without restrictors.
- Set of two, mixed: one adapter without a restrictor and one with a built-in restrictor.
Before ordering
Check your heater core connection size, available clearance, and hose routing before ordering. Choose the adapter quantity and restrictor configuration required for your cooling system using the options above. A matching connection size alone does not confirm clearance on every vehicle or engine swap.
Need help selecting a configuration? Contact GAPerformance with your vehicle and cooling system details.
Explore more GAPerformance billet parts, or view the complete -10AN heater core to coolant crossover kit for a broader plumbing solution.
