EDELBROCK RETRO-FIT HEADER SYSTEM
For GM Bodies: A ‘64-’67, ‘68-’72; F ‘70-’81; and X ‘75-’79
Catalog #65063, 65073, 65083, 65123
INSTALLATION INSTRUCTIONS
Please study these instructions carefully before installing your new Edelbrock Retro-Fit LS1 Header System. If you have any
questions, please contact our Technical Hotline at: 1-800-416-8628 , 7am - 5pm, Monday-Friday, Pacific Standard Time or e-mail
DESCRIPTION: These header systems are designed to improve the exhaust efficiency of either the Vortec style head equipped
Small Block Chevrolet engine or the LS series engine as it is used in the A, F, or X-body chassis. It is highly recommended to use
the Edelbrock Engine Mounting Adapter Plates # 6701 for the LS series engine headers #65063 or #65073. These headers are
designed to work with the corresponding Edelbrock Header-Back for the appropriate chassis style.
Suggested Tools for Installation:
❑SAE and metric sockets, ratchets, and wrenches ❑Floor jack and load rated jackstands
APPLICATIONS: HEADER COMPONENTS:
IMPORTANT NOTE:
Proper installation is the responsibility of the installer. Improper installation will void
warranty and may result in poor performance and engine or vehicle damage.
KIT CONTENTS (#65063 & #65073): KIT CONTENTS (#65083 & #65123):
Part #: Year Range: Body Style: Engine Family:
65063 1964 - 1967 ALS1
65073 1968 - 1972 ALS1
65073 1970 - 1981 FLS1
65073 1975 - 1979 XLS1
65083 1964 - 1972 AVortec
65123 1970 - 1981 FVortec
65123 1975 - 1979 XVortec
Part #: Quantity: Component #: Description
65063 1 25-9825 Left Header
65063 1 25-9826 Right Header
65073 1 25-9810 Left Header
65073 1 25-9811 Right Header
65083 1 25-9821 Left Header
65083 1 25-9822 Right Header
Quantity: Component #: Description:
254-8200 3” Donut Gaskets
254-6600 LS series Port Flange Gaskets
12 68-0350 8mm - 1.25 x 30mm Bolts
12 82-4620 8mm Lock Washers
12 82-8721 8mm Hardened Washers
468-8565 3/8” - 16 x 2-1/2” Hex Bolts
482-5240 3/8” Flat Washers
482-5590 3/8” Lock Washers
460-9185 3/8” - 16 Hex Nut
252-9710 O2Sensor Bungs
223-4113 Collector Flange
279-9027 Collector Ext. (Stub Tube)
Quantity: Component #: Description:
254-8200 3” Donut Gaskets
254-6590 Port Flange Gaskets
12 36-0716 3/8” - 16 x 1” Header Bolts
482-7231 3/8” Hardened Washers
468-8565 3/8” - 16 x 2-1/2” Hex Bolts
482-5240 3/8” Flat Washers
16 82-5590 3/8” Lock Washers
460-9185 3/8” - 16 Hex Nut
223-4113 Collector Flange
279-9027 Collector Ext. (Stub Tube)
