Hedman Hedders has been manufacturing quality headers in the USA since 1954, and classic musclecars is their specialty. Each set uses mild steel, smooth flowing, CNC mandrel bent tubes, that are hand-welded to ensure each pair is identical to the next. Hedman's unique, gasketless ball and socket collector design allows you to bolt up, even if it is not perfectly aligned with the header collectors.

Hedman Hedders is so confident in the quality of its headers that these headers are factory backed by a Limited Lifetime Warranty.

Features

HTC Coated Engine Swap Hedders
1-1/2 In. Tube Dia.
2-1/2 In. Coll.
D-Port Heads
Shorty Design

Application

1995-2004 Chevrolet Blazer CID 283 GAS RWD
1995-2004 Chevrolet Blazer CID 327 GAS RWD
1995-2004 Chevrolet Blazer CID 350 GAS RWD
1995-2004 Chevrolet Blazer CID 400 GAS RWD
1982-2003 Chevrolet S10 CID 283 GAS RWD
1982-2003 Chevrolet S10 CID 327 GAS RWD
1982-2003 Chevrolet S10 CID 350 GAS RWD
1982-2003 Chevrolet S10 CID 400 GAS RWD
1983-1994 Chevrolet S10 Blazer CID 283 GAS RWD
1983-1994 Chevrolet S10 Blazer CID 327 GAS RWD
1983-1994 Chevrolet S10 Blazer CID 350 GAS RWD
1983-1994 Chevrolet S10 Blazer CID 400 GAS RWD
1982-1984 GMC Jimmy CID 283 GAS RWD
1992-2001 GMC Jimmy CID 283 GAS RWD
1982-1984 GMC Jimmy CID 327 GAS RWD
1992-2001 GMC Jimmy CID 327 GAS RWD
1982-1984 GMC Jimmy CID 350 GAS RWD
1992-2001 GMC Jimmy CID 350 GAS RWD
1982-1984 GMC Jimmy CID 400 GAS RWD
1992-2001 GMC Jimmy CID 400 GAS RWD
1982-1990 GMC S15 CID 283 GAS RWD
1982-1990 GMC S15 CID 327 GAS RWD
1982-1990 GMC S15 CID 350 GAS RWD
1982-1990 GMC S15 CID 400 GAS RWD
1983-1991 GMC S15 Jimmy CID 283 GAS RWD
1983-1991 GMC S15 Jimmy CID 327 GAS RWD
1983-1991 GMC S15 Jimmy CID 350 GAS RWD
1983-1991 GMC S15 Jimmy CID 400 GAS RWD
1991-2003 GMC Sonoma CID 283 GAS RWD
1991-2003 GMC Sonoma CID 327 GAS RWD
1991-2003 GMC Sonoma CID 350 GAS RWD
1991-2003 GMC Sonoma CID 400 GAS RWD
1996-2000 Isuzu Hombre CID 283 GAS RWD
1996-2000 Isuzu Hombre CID 327 GAS RWD
1996-2000 Isuzu Hombre CID 350 GAS RWD
1996-2000 Isuzu Hombre CID 400 GAS RWD
2002-2004 Oldsmobile Bravada CID 283 GAS RWD
2002-2004 Oldsmobile Bravada CID 327 GAS RWD
2002-2004 Oldsmobile Bravada CID 350 GAS RWD
2002-2004 Oldsmobile Bravada CID 400 GAS RWD

Specs

Manufacturer Specs:

TUBE DIAMETER	1-1/2 in.
TUBE STYLE	Mid-Length
AIR CONDITIONING	Yes
AUTOMATIC TRANSMISSION - COLUMN	No
AUTOMATIC TRANSMISSION - FLOOR	Yes
MANUAL TRANSMISSION - COLUMN	No
MANUAL TRANSMISSION - FLOOR	Yes
POWER STEERING	Yes
COLLECTOR ATTACHMENT	2-1/2 in.
COLLECTOR DIAMETER	2-1/2 in.
COLLECTOR SIZE	2-1/2 in.
COLLECTOR STYLE	BALL and SOCKET Style (Gasketless)
REDUCER OUTLET SIZE	2-1/2 in.
EXHAUST SYSTEM DIA	2-1/2 in.
CONTENTS	Header(s), new bolts, gasket(s) to head, reducer(s) and hardware, instructions
ENGINE	Chevy SB 283-400 (Gen 1) 1958-86
FINISH	HTC Polished Silver Ceramic-Metallic
FINISH TYPE	HTC SILVER (polished) Ceramic-metallic Coating
FLANGE STYLE	Standard
FLANGE THICKNESS	0.3125 in.
HEADER STYLE	Mid-Length Tube
NOTES	82-00 GM S10/15, Blazer, Jimmy, Sonoma 2WD SBC
MATERIAL	Mild Steel
TUBE DESIGN	Standard
TUBE LENGTH	Mid-Length Tubes
TUBE MATERIAL THICKNESS	16g
TUBE SIZE	1-1/2 in.
WITH AIR SYSTEM	No
WITH EGR	No
EO	No
WELD-UP	No
TUNED	No
BOLTS/STUDS INCLUDED	Yes
CATALYTIC CONVERTERS INCLUDED	No
CROSSOVER PIPE INCLUDED	No
GASKET OR SEAL INCLUDED	Yes
HEADER FASTENERS INCLUDED	Yes
INSTALLATION HARDWARE INCLUDED	Yes
MOTOR MOUNTS INCLUDED	No
MOUNTING HARDWARE INCLUDED	Yes
REDUCERS INCLUDED	Yes
Y-PIPE INCLUDED	No
QUANTITY	Sold as a pair.
PRIMARY TUBE GAUGE	16g
PRIMARY TUBE DIAMETER IN	1.50 in.
PACKAGE CONTENTS	Headers, ball and socket reducers (exhaust adapters), gaskets, mounting hardware
HEADER MATERIAL	Mild Steel
HEADER FINISH	HTC Polished Silver Ceramic-Metallic
CYLINDER HEAD PORT SHAPE	D-port
CYLINDER HEAD	D-Port Heads
HEADER CONSTRUCTION	MILD STEEL- Standard-Duty
REPLACEMENT GASKET	41827540
REPLACEMENT HEAD FLANGE GASKET	41827540
HEADER PORT SHAPE	D-Port
PORT SHAPE	D-port
COLLECTOR BOLTS INCLUDED	Yes
AIR CONDITIONING NOTES	2WD Only.
DRIVETRAIN	D-PORT
PRODUCT INFO	2WD Only!
VEHICLE FAMILY1	D-Port Heads
product-attribute-image	CHEVY 283-350 into S10 , S15 (2WD) - Motor Mount Kit

Guides & Documents

Headers Installation Instructions (41866539)

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CA Prop 65

CARB warning

Hedman Hedders 66539 Specifications

KEY SPECS
MFG. Part #	66539
Brand	Hedman Hedders
Header Tube Type	Mid-Length
Exhaust Port Shape	D-port
Flange Style	Standard
Primary Tube Diameter	1-1/2"
Material Type	Mild Steel
Color	Silver
Weld-Up	No
Collector Diameter	2-1/2 Inch
Finish	Polished
Hardware Included	Yes
Gasket(s) Included	Yes
Collector Reducers Included	Yes
Collector Reducer Exit Diameter	2.5"

GENERAL
Sold in Quantity	Set
Collector Length	2.5"
Flange Thickness	0.3125"
Tuned	No
Crossover Pipe Included	No
Primary Tube Gauge	16-gauge

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