Home / Shop / Hooker Exhaust Manifolds 8525-3HKR Manifold, SBC, Manifolds, Rectangular Port, 2.5 in. Outlet, Black, Pair

Hooker Exhaust Manifolds 8525-3HKR Manifold, SBC, Manifolds, Rectangular Port, 2.5 in. Outlet, Black, Pair

SKU: HOK8525-3HKR

Exhaust Manifolds

Hooker Headers

Hooker Exhaust Manifolds 8525-3HKR Manifold, SBC, Manifolds, Rectangular Port, 2.5 in. Outlet, Black, Pair

SKU: HOK8525-3HKR

Exhaust Manifolds

IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

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Description

IMPORTANT NOTICE: Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Hooker exhaust manifolds offer improved flow. They feature cast iron construction with 2.5 in. diameter outlets and have been designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications. Their contoured design aims the exhaust directly at the exit port for improved flow. Hooker exhaust manifolds will provide years of leak-free performance with less underhood noise than traditional headers. Plus, their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance.

Features include:

* Intended for engine swap applications where durability, quiet operation, and leak-free sealing is desired
* Available in plain as-cast finish or with various Hooker ceramic coatings for reduced engine compartment temperatures and improved corrosion resistance
* Nickel plated steel mating flanges, MLS mating flange gaskets, and mating flange hardware included
* Cast from high-silicon-moly ductile iron to provide durability and corrosion resistance
* 2.5 in. outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
*Tight tuck design provides universal fit for most popular chassis and a clean, traditional muscle car appearance

Part Type

Exhaust Manifold Set Cast Iron - SBC 2.5 Dia

Data: v4.2 - Upd: 2026-09-29 03:34:36

Specifications

Product Attributes - Brand: Hooker Headers
Product Attributes - Manufacturer's Part Number: 8525-3HKR
Product Attributes - Part Type: Exhaust Manifolds
Product Attributes - Product Line: Hooker Exhaust Manifolds
Product Attributes - UPC: 090127100707
Product Attributes - Exhaust Manifold Material: Cast iron
Product Attributes - Exhaust Manifold Color: Black ceramic coated
Product Attributes - Mounting Hardware Included: Yes
Product Attributes - Exhaust Manifold Gaskets Included: Yes
Product Attributes - Remanufactured: No
Product Attributes - Quantity: Sold as a pair.
Product Attributes - Notes: Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Reference Information

Brand Name/s	Hooker Headers
StreetFX SKU	hok8525-3HKR
SFX Item ID	5013024
Supplier Item Code	5013024
Manufacturer SKU	8525-3HKR
Manufacturer UPC	90127100707
Alternative References	HKR8525-3HKR

Compatibility

Application Data

Make	CHEVROLET
Beginning Year	1955
Ending Year	1957
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.3L/265
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1955
Ending Year	1957
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.3L/265
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1957
Ending Year	1967
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.6L/283
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1957
Ending Year	1967
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.6L/283
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1962
Ending Year	1969
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.3L/327
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1962
Ending Year	1969
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.3L/327
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1964
Ending Year	1967
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.4L/327
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1964
Ending Year	1967
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.4L/327
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1967
Ending Year	1969
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.9L/302
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1967
Ending Year	1969
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.9L/302
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1967
Ending Year	2002
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1967
Ending Year	2002
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1968
Ending Year	1973
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.0L/307
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1968
Ending Year	1973
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.0L/307
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1970
Ending Year	1980
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1970
Ending Year	1980
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	6.6L/400
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1975
Ending Year	1976
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.3L/262
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1975
Ending Year	1976
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.3L/262
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1976
Ending Year	2002
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.0L/305
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1976
Ending Year	2002
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	5.0L/305
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1979
Ending Year	1982
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.4L/267
Exhaust Manifold Location	Left
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

Make	CHEVROLET
Beginning Year	1979
Ending Year	1982
Engine Type	V8
Engine Family	Chevy small block Gen I
Engine Size	4.4L/267
Exhaust Manifold Location	Right
Application Notes	Designed for applications manufactured before 1966 with rectangular ports, fits with straight spark plugs. Modifications are required for installation, will not fit first generation Camaro and Firebird applications. Collector diameter is 2 1/2 in. Includes manifold flange and collector hardware with gaskets.

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Hooker Exhaust Manifolds 8525-3HKR Manifold, SBC, Manifolds, Rectangular Port, 2.5 in. Outlet, Black, Pair

Hooker Exhaust Manifolds 8525-3HKR Manifold, SBC, Manifolds, Rectangular Port, 2.5 in. Outlet, Black, Pair

Description

Part Type

Specifications

Reference Information

Compatibility

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