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HEAD GASKETS
You must use the correct head gaskets to achieve a 9.5:1
compression ratio for best power.
compression and power, and thinner gaskets will raise compression
higher than advisable for use with today's unleaded pump gasoline.
1.
Use Edelbrock gasket set #1640 for 1984-91 or #1641 for
1992 and later engines. This set includes the proper thickness
head gaskets (.045") and the special intake manifold gaskets
required for these cylinder heads.
2.
You may use standard Harley-Davidson
They vary in thickness, so it is advisable to measure your gasket
before use (See Figure 5) . Recommended thickness is .045".
If you use copper head gaskets, be aware that they
must be properly annealed prior to installation. Even
if gaskets were annealed when new, copper can re-
harden during storage.
installation may lead to head gasket failure.
Figure 5 - Measuring Cylinder Head Gasket
CYLINDER HEAD INSTALLATION
Install new O-rings over the cylinder dowels before
installing the head gasket. Install the O-rings first to
ensure alignment of the head gasket and prevent
gasket leaks.
Use only original equipment specification head bolts
and other hardware.
hardened grade 8 material, which is required for
proper performance of these parts.
Be sure the gasket surfaces and stud holes are clean and dry (See
1.
Figure 6) . Place new O-rings (13) on the cylinders and position the
head gaskets on the inserts (13) (See Figure 7) .
2.
Dip the head bolt threads and bottom face of bolt head in oil; then
wipe off any excess. Install the head bolts (1 and 2, Figure 4) finger
tight.
Catalog #1604, 1606, 1607, 1624, 16041 & 16061
Rev. 3/07 - RS/mc
INSTALLATION PROCEDURE
Thicker gaskets will lower
®
head gaskets, if desired.
CAUTION
Failure to anneal before
CAUTION
CAUTION
All original hardware is
Figure 6 - Cleaning Gasket Surfaces
Figure 7 - Cylinder O-Rings and Inserts
1
2
2
1
Figure 8 - Cylinder Head Bolt Torque Sequence
4 of 6
3
Front cylinder
4
4
Rear cylinder
3
©2007 Edelbrock Corporation
Brochure #63-1604
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