Owners manual

ManualsBrandsHooker Headers ManualsAutomotive2455-1HKR Super Competition Long Tube Header

2455HKR (black), 2455-1HKR (metallic ceramic), & 2455-2HKR (stainless)

Competition Header for 70-72 Chevy

Camaro, 64-74 Chevelle/El

Camino/Caballero/Sprint, 70-74 Monte Carlo, & 71-74 Passenger Car/Wagon

Instruction Sheet

NOTE: This will not fit with a manual transmission on the Monte Carlo or late passenger/wagon models.

NOTE: This will not fit on Camaros with a column shift.

WARNING! Breaking in an engine with ceramic-coated headers WILL result in damage to the coating and will VOID all warranties.

Ceramic-coated headers require several heat cycles to fully cure before they will withstand extreme heat. Hooker®

recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage.

Please call tech service at 1-866-GOHOLLEY for additional information regarding ceramic-coated exhaust products.

BEFORE STARTING

Your vehicle must be raised a minimum of 36 inches. A floor hoist is ideal. If no hoist is available we strongly urge the use of axle stands as a

safety measure.

CAUTION! Your car should not be supported on a bumper jack prior to installing headers, take the time to make a careful and complete

inspection of both engine and transmission mounts. Replace them if they look worn or damaged, otherwise this may affect the

header fitting into your vehicle properly.

HEADER INSTALLATION PROCEDURE/ DISASSEMBLY & ASSEMBLY INSTRUCTIONS

PLEASE READ THOROUGHLY & CAREFULLY

LEFT SIDE

1. Disconnect the battery cable to prevent damage to the electrical systems.

2. Unbolt the headpipe from the stock exhaust manifold and push aside.

3. Remove the spark plugs, oil filter, clutch linkage (if so equipped), center motor mount bolt, air conditioning (if mounted on left side), and

power steering (if mounted on head).

NOTE:

On some models, it will be necessary to bend the frame support rod to clear the headers, or remove it. See Figure A.

Figure A

Summary of content (4 pages)

PAGE 1
2455HKR (black), 2455-1HKR (metallic ceramic), & 2455-2HKR (stainless) Competition Header for 70-72 Chevy Camaro, 64-74 Chevelle/El Camino/Caballero/Sprint, 70-74 Monte Carlo, & 71-74 Passenger Car/Wagon Instruction Sheet NOTE: This will not fit with a manual transmission on the Monte Carlo or late passenger/wagon models. NOTE: This will not fit on Camaros with a column shift. WARNING! Breaking in an engine with ceramic-coated headers WILL result in damage to the coating and will VOID all warranties.
PAGE 2
NOTE: Some models require the brake line block to be relocated from the side of the frame to the top of the frame to provide maximum clearance for the header. 4. Place a board under the oil pan and jack up the engine approximately 2 inches. 5. Starting from below, work the header up through the chassis into position. NOTE: It may be necessary to modify the motor mount, according to Figure B, if the L-1 pipe does not have sufficient clearance. Figure B 6.
PAGE 3
RIGHT SIDE 1. Remove the spark plugs, dipstick tube, stock exhaust manifold, and air conditioning (if mounted on right side). 2. Starting from below, work the header up through the chassis into position. Check the clearances. NOTE: It may be necessary to increase clearances. 1) Bend or remove the frame support brace. See Figure A. 2) Trim A-frame bolts flush with the nuts. See Figure F. 3) Slightly dent the header pipe R-2 according to Figure G (this modification will not affect performance).
PAGE 4
Figure I NOTE: 1968 Chevelle/El Camino models: Fabricate a spacer and use one bolt from the stock exhaust manifold. See Figure I. 7. To connect the collector to the headpipe, purchase a Hooker reducer kit, P/N 11035HKR. NOTE: Finish the performance job your headers started by adding a Hooker competition dual exhaust system. Large 2 1/4” diameter tubing is mandrel bent, not press bent.