Edelbrock 61905 Installation Instructions

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.
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 Performer LT-1 cylinder heads are designed for street/high performance use on LT-1, 5.7L, Small block Chevrolet engines.
They also replace original equipment on 1992 through 1997 LT-1 5.7L equipped vehicles (C.A.R.B. E.O. Call Edelbrock for detailed information).
Edelbrock LT-1 heads feature high velocity 170cc intake ports, 70cc exhaust ports and 54cc combustion chambers. Complete heads come assembled
with valvetrain parts capable of operating up to 6500 rpm. Higher rpm applications will require the use of suitable valvetrain parts like larger valve
springs and retainers. Other outstanding features include phosphor-bronze valve guides, ductile iron valve seats and premium one-piece stainless
steel high-flow 1.940" intake and 1.550" exhaust valves, heat-treated machined steel retainers, valve locks, rocker studs and hardened washers, along
with heavy duty valve springs which work with cams having valve lifts up to .600". Spring load at .600" lift is 420 lbs. Check camshaft manufacturer's
spring load specifications when using other than Edelbrock camshafts. These powerful heads use the stock location for intake and exhaust flanges and
bolt holes, and centerbolt valve cover rails for compatibility with original equipment and aftermarket parts. Bolt holes for exhaust and intake flanges
and rocker studs are fitted with helicoil inserts for increased strength. LT-1 heads are available either bare or complete.
Complete cylinder heads are assembled using the following components:
• Stainless steel, one-piece, swirl-polished intake and exhaust valves with under-cut stems for increased flow
• Rocker studs and hardened washers for use with self-aligning rocker arms
• High quality vitton lip seals with metal jacket
• Edelbrock Sure-Seat valve springs #5845
• Retainers #9724
• Valve keepers #9616
• Valve spring seats #5769
Complete cylinder heads are assembled and prepared for trouble-free installation right out of the box. Bare cylinder heads will have valve guides
and seats installed, but will require final sizing of the valve guides and a valve job to match the valves you will be using.
For a successful installation, the Edelbrock Performer Cylinder Heads require some components other than original equipment parts. To complete your
installation, you will need the following items:
q Head gaskets; GM #10168457 or Fel-Pro #1074 or equivalent.
q Intake manifold gaskets; GM # 12367777 or Fel-Pro #1284 (Will
require port matching).
q Exhaust gaskets; Fel-Pro #1404 or equivalent.
q Edelbrock head bolt kit #8550; (see instructions below).
CHECKING PISTON-TO-VALVE, PISTON-TO-BORE AND PISTON-TO-HEAD CLEARANCES: Prior to installation, it is highly recommended that valve-
to-piston clearances are checked and corrected to minimum specs, if necessary. A minimum of 0.100" clearance is recommended for both intake
and exhaust. If other than stock valve sizes are used, they may not work with the valve pockets in stock pistons, especially if a high lift cam is used.
The use of aftermarket pistons and/or custom machining to your pistons may be required. Actual valve-to-piston clearance should be specified by
your camshaft manufacturer. If these cylinder heads are used on small bore engines, valve-to-bore clearance should also be checked, and the top of
the bore notched for clearance, if necessary.
ACCESSORIES: Although Edelbrock Performer LT-1 Heads will accept OEM components (valve covers, intake manifold, etc.), we highly recommend
that premium quality hardware be used with your new heads:
Catalog #61905, 61919
Rev..11/09/12 - QT/mc
®
Hardware & Parts Required for Installation
PERFORMER LT-1 CYLINDER HEADS
For 1992-1997 Chevrolet LT-1 Engines
Catalog #61905 (Complete), #61919 (Bare)
q 14mm x 3/4" reach gasketed spark plugs, Champion RC-12YC or
equivalent.
q Pushrods; .100" longer-than-stock, hardened preferred (if using
stock type rocker arms)
q Self-aligning rocker arms - GM #12495490 (stamped steel
1.5:1 ratio); GM #12370838 (aluminum roller, 1.5:1 ratio); & GM
#12370839 (aluminum roller 1.6:1 ratio) or equivalent.
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INSTALLATION INSTRUCTIONS
©2012 Edelbrock LLC
Brochure #63-0158