S&S Cycle Stock Replacement 3 7/16 and 3 1/2 Bore Shovelhead Cylinders - Manual (Page 2)

INTRODUCTION
S&S ® stock bore shovelhead cylinders are designed for
stock replacement and high performance applications in
74" and 80" shovelhead engines. Superior material and
design provide increased strength and improved wear
resistance.
NOTES:
●
Cylinders for 74" engines have a bore size of 3.437",
and 80" cylinders have a bore size of 3.498". S&S
cylinders are final honed slightly undersize to allow
maximum flexibility in piston fitting.
● Due to increased section thickness S&S cylinders
require the use of special S&S head bolts. Early
production S&S cylinders also require the use of special
S&S cylinder base nuts. Stock cylinder base nuts may
be used with current production S&S cylinders.
● The S&S rear cylinder does not have the larger base
flange found on stock cylinders. For this reason S&S
supplies a special rear gasket to fit the smaller base
flange. Stock gaskets may be trimmed to fit if desired.
● S&S cylinders are machined with two oil return holes.
One hole is in the stock location and the other is
lowered for stroker applications. These cylinders may
be bolted on as is for stock replacement applications,
but minor crankcase and cylinder oil return hole
modifications are necessary for most stroker engines.
See Step 2.
● S&S cylinders are clearanced for S&S Supreme
connecting rods in engines of up to 4
3 ⁄
4
" stroke.
However since it is nearly impossible to anticipate
every possible engine combination, it is the engine
builder’s responsibility to check for proper running
clearances. S&S considers checking and establishing
all running clearances as standard engine building
practice that must be performed during engine
assembly. Engine failure due to improper clearances
between moving parts is not covered under warranty.
Contact between moving engine components may
cause damage or destruction of the parts involved and
produce abrasive particles which may cause damage or
premature wear to other engine components.
To avoid parts damage and obtain accurate torque
readings, clean head bolt threads thoroughly before
installation. For knucklehead, panhead, or shovelhead,
head bolt threads and area of bolt head that contacts
washer (if applicable) or cylinder must then be
lubricated with Permatex
® Anti-Seize Lubricant or
similar anti-seize compound. S&S has received reports
of thread damage in these engines associated with use
of engine oil to lubricate head bolts.
INSTALLATION
1. Inspect cylinders to insure that they are correct for the
intended application.
2. For engines of 4 1 ⁄
2
" or longer stroke, the oil return holes
in the stock location must be plugged, and the
crankcase must be modified to use the lowered oil
return holes. This modification is necessary due to
increased piston travel in longer stroke engines. Oil
control ring position will be below stock cylinder oil
return hole at the bottom of the stroke. If modification
is not done, oil will be carried to the combustion
chamber by piston rings causing engine to smoke.
NOTE: Engines with stroke shorter than 4 1 ⁄
2
" stroke do not
require this step.
A. If using stock cylinder base gaskets, place base
gasket on cylinder base gasket surface, and punch
1 ⁄
4
" hole in gasket directly in center of oil return
hole in base gasket surface of cylinder. S&S gaskets
are pre-punched.
B. Place gasket on driveside crankcase half in its
respective position. Mark crankcase gasket surface
through
1 ⁄
4
" diameter hole in gasket.
C. Drill 1 ⁄
4
" diameter hole perpendicular into crankcase
gasket surface 5 ⁄
8
" deep. See Figure 1.
2
CAUTION
CAUTION
Figure 1