©2011 Edelbrock LLC
Brochure #63-0459
Page 1 of 2
Part #61409
Rev. 3/11 - AJ/mc
EDELBROCK/MUSI VICTOR 24° CNC CYLINDER HEAD
For Big Block Chevrolet
Part #61409
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 warranty and may result in poor performance and engine or vehicle damage.
DESCRIPTION:
Edelbrock/Musi Victor 24° CNC-Ported Big Block Chevrolet cylinder heads are designed for high rpm or large displacement big
block Chevrolet applications using rectangular port heads. CNC ported, rectangular intake ports are raised .100” and CNC-ported exhaust ports
are raised .750” for greatly improved flow paths and more power. 119cc open-style, CNC-profiled combustion chambers facilitate high
compression ratios and rocker stud bosses are reinforced for valve train stability. For maximum head gasket retention, these heads include two
auxiliary head bolt holes
(
Note:
These bolt holes must be plugged off if not in use). These heads will accommodate all standard location
rectangular port Victor series intake manifolds. These heads will fit all 1965 and later big block Chevrolet blocks. The valve seats and valve guides
have been machined for recommended valve sizes and will need final clearances to be checked by the engine builder. We recommend Edelbrock
intake #2917 for a matched port intake.
IMPORTANT NOTES:
The #61409 heads are designed for a 4.470”
bore or larger. Intake valves should measure 5.600” or longer and
exhaust valves should measure at least 5.500” in length. The unique
valve locations and angles require Edelbrock guideplate #38-6067 for
proper valve train geometry, and also require stud girdle #7796.
ACCESSORIES & INSTALLATION ITEMS:
We highly recommend that
premium quality hardware be used with your new heads. See our
catalog for details. To order a catalog, call
(800) FUN-TEAM
, or visit
our website at:
www.Edelbrock.com.
Head Bolts:
High quality head bolts or head studs with hardened
washers must be used to prevent galling of the aluminum bolt bosses.
Edelbrock Head Bolt Kit #8554 can be used with all 1965 and later big
block Chevrolet engine blocks.
The head bolt boss heights and
required bolt lengths are listed below
(See Fig. 1)
, along with the
head bolt tightening sequence.
The bolt bosses adjacent to the
exhaust port exits (position 2, 7, 8, and 15), require a 5.50” long head
bolt.
These bosses have been raised to provide more material
thickness between the head bolt boss counterbore and the exhaust
port wall. Many of the other head bolt boss heights have also been
adjusted to prevent head bolt bottoming in Mark IV, Gen V, and Gen VI
engine blocks.
NOTE:
On blocks with blind bolt holes, mount the heads on
the block without a gasket then test fit all head bolts without
washers to ensure that the flange of each head bolt tightens
flush against the bolt boss. Any bolts that bottom out prior to
contacting their boss will need to have sufficient threads
removed so that they seat flush to the boss.
Guideplates:
Use ONLY Edelbrock #38-6067 guideplates (included).
Shaft Style Rocker Arms:
When using shaft style rocker arms,
Edelbrock recommends the use of Jesel or T&D rockers.
Screw-In Stud Rocker Arms:
The exhaust rocker stud bosses are
made with extra long thread inserts and hole depth to allow exhaust
rocker studs with extra long installation thread length to improve
rocker stud durability. Select the appropriate rocker arm studs for your
application.
Rocker Arms:
Aftermarket roller rocker arms must be used for this
cylinder head when using screw-in studs.
Valve Covers:
The valve cover flange is designed to work with Gen V
and Gen VI style valve covers with an o-ring seal valve cover gasket,
as well as Mark IV type valve covers. Use Edelbrock Signature Series
chrome valve covers #4680 or Elite Series polished aluminum valve
covers #4280.
Intake Manifolds:
Choosing the correct intake manifold will depend
upon your specific engine combination. Please consult with your
engine builder or contact Edelbrock via our
Technical Hotline
at
1-
800-416-8628
for information regarding intake manifold selection.
Exhaust Headers:
Any header or manifold designed for original
equipment heads will fit the Edelbrock Race Cylinder Heads. Fel-Pro
exhaust gaskets, #1411, #1412, or equivalent are recommended for
this application.
It is recommended to check proper clearance
between the exhaust flange and the head bolt relief.
Spark Plugs:
Use 14mm x 3/4” reach, gasketed spark plugs. Heat
range for competition applications will vary. We recommend the use
of
anti-seize
on the spark plug threads to prevent galling in the
cylinder head, and torque to 10 ft-lbs.
DO NOT OVERTIGHTEN
.
INSTALLATION PROCEDURE
