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PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and
procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this installation,
it is recommended to have the installation completed by a qualified mechanic. If you have any questions, please call our Technical Hotline at:
1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at Edelbrock@Edelbrock.com.
IMPORTANT NOTE: Proper installation is the responsibility of the installer. Improper installation
will void your warranty and may result in poor performance and engine or vehicle damage.
DESCRIPTION: Edelbrock Two Piece Timing Covers are designed to offer convenient access for timing adjustments and cam swaps in 1998-2004
LS1/LS6 Gen III Chevrolet engines and 2004 and later Gen IV engines. A small metal plate held in by cap screws can be removed to provide access
to the camshaft and upper timing gear while the main crank seal and timing cover gasket remain undisturbed. Please note that accessing this plate
will require removal of the water pump, and draining of the cooling system (though not necessarily in that order).
NOTE: Timing Cover #4254 is not compatible with Chevrolet Gen IV engines, which include LS2, LS4, LS7 and others. Timing Cover #4255 is
not compatible with Chevrolet Gen III engines, which include LS1, LS6, and others. Please refer to the table on the next page if you are
uncertain of your engine generation.
BEFORE BEGINNING: This installation is most easily accomplished with the engine out of the vehicle. However, if your engine is in the vehicle, the
removal of all vehicle pieces in order to provide access to the engine front cover and the removal of parts in order to provide clearance to remove and
install the camshaft will not be covered. These items may include the cooling fans, radiator, emissions equipment bracketry, A/C brackets, A/C
condenser, etc. Depending on the model of your vehicle, if the engine is in the vehicle, temporarily raising the engine in the engine compartment may
be required to gain enough clearance to remove and install the camshaft. Please refer to your factory service manual for these procedures. If the
vehicle needs to be raised for any reason, always use the factory recommended lift points and methods of supporting the vehicle. Failure to do so
could result in vehicle damage, personal injury, and/or death.
LEGAL NOTICE: If the Air Conditioning condenser needs to be removed to provide clearance for timing cover or camshaft removal, have the system
evacuated by an appropriate repair facility BEFORE starting the installation. The same facility can recharge the system after installation. Discharging
the air conditioning coolant to atmosphere violates EPA regulations and is punishable by law.
PARTS REMOVAL
1.
Make sure the vehicle is on level ground and supported properly. Drain engine coolant, storing it in an appropriate container or disposing of it
properly. Refer to the factory service manual for proper draining procedure. Make sure the negative battery cable is disconnected.
2.
After getting access to the front of the engine, remove the serpentine accessory drive belt, accessory drive belt tensioner, drive belt idler pulley,
and any hoses connected to the water pump. Follow the factory service manual procedure.
3.
Remove the water pump (See service manual).
Remove the balancer bolt. Using the Crankshaft Balancer Remover (J-41816) and the Crankshaft End Protector (J-41816-2) , remove the balancer
4.
from the crankshaft. NOTE: Some LS1 engines (originally installed in Corvettes) do not use a key or keyway to position the crankshaft balancer
on the crank. If your engine does not use a key, mark or scribe the end of the crankshaft and the balancer before removal. Refer to the factory
service manual for the proper procedure to remove and install the balancer.
5.
Remove the front cover and gasket. Edelbrock recommends installing a new front crank seal as it will difficult to remove your stock seal without
damaging it. At this time, you should inspect the oil pan gasket for damage. Remove the oil pan and replace the gasket if necessary (See service
manual) .
NOTE: Now is a good time to inspect the timing set. Replace, if necessary, following the service manual procedure.
Catalog #4254, #4255
Rev. 6/08 - AJ/mc
®
ADDITIONAL PARTS REQUIRED FOR INSTALLATION:
❑ - Front Crank Seal (GM P/N: 12585673)
LS1/LS2 Two Piece Timing Cover
For Gen III/IV Small Block Chevy Engines
Page 1 of 3
Catalog #4254 & #4255
INSTALLATION INSTRUCTIONS
©2008 Edelbrock Corporation
Brochure #63-4254
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Summary of Contents for Edelbrock 4254
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Page 1: Installation Instructions
(though not necessarily in that order). NOTE: Timing Cover #4254 is not compatible with Chevrolet Gen IV engines, which include LS2, LS4, LS7 and others. Timing Cover #4255 is not compatible with Chevrolet Gen III engines, which include LS1, LS6, and others. - Page 2 CAMSHAFT INSTALLATION The Edelbrock Two Piece Timing Cover greatly simplifies the process of installing a new camshaft, but timing it properly with the crank gear hidden can be challenging. The standard method of timing the camshaft is to have the timing marks on the crank and cam gears at the twelve o’clock and 6 o’clock positions respectively.
- Page 3 FIGURE 2 Catalog #4254, #4255 Rev. 6/08 - AJ/mc Make a mark on the harmonic balancer at the point closest to this indicator. You can...
- Page 4 ® Edelbrock Corporation • 2700 California St. • Torrance, CA 90503 Tech-Line: 1-800-416-8628 • E-Mail: Edelbrock@Edelbrock.com Catalog #4254, #4255 ©2008 Edelbrock Corporation Rev. 6/08 - AJ/mc Brochure #63-4254...