Basic Specs for single cylinder, aluminum block, flat head engines.

You may be more familiar with the term "side valve" or "L head" instead of "flat head". Aluminum blocks with steel sleeves are included here.

See the table following this one for "Cast Iron" block flat heads.

Some common specs where applicable.
Initial Carb Settings; High speed=1 1/2. Idle=1 1/4.
Ring gap reject size; Compression rings=.035"(Cast Iron=.030")
Oil ring=.045"(Cast Iron=.035")
Spark Plug gap=.030"
Points gap=.020"
Basic Model
Series		 Idle
Speed		 Armature
Air Gap		 Valve Clearance Torque
Specs
Intake Exhaust Flywheel
Nut		 Cylinder
Head		 Conn
Rod
60000 1750 .006"
.010"		 .005"
.007"		 .007"
.009"		 55 ft
lbs		 140
in lbs		 100
in lbs
80000
81000
82000		 1750 .006"
.010"		 .005"
.007"		 .007"
.009"		 55 ft
lbs		 140
in lbs		 100
in lbs
90000
92000
93000
94000
95000		 1750 .006"
.010"		 .005"
.007"		 .007"
.009"		 55 ft
lbs		 140
in lbs		 100
in lbs
100200
100900		 1750 .010"
.014"		 .005"
.007"		 .007"
.009"		 60 ft
lbs		 140
in lbs		 100
in lbs
100700
10A900
10B900
10c900		 1750 .006"
.010"		 .005"
.007"		 .007"
.009"		 55 ft
lbs		 140
in lbs		 100
in lbs
120000 1750 .006"
.010"		 .005"
.007"		 .007"
.009"		 55 ft
lbs		 140
in lbs		 100
in lbs
130000 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 60 ft
lbs		 140
in lbs		 100
in lbs
170000 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 165
in lbs
190000 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 185
in lbs
220000 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 185
in lbs
250000 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 185
in lbs
280000
except
286700		 1750 .010"
.014"		 .005"
.007"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 refer to
manual
286700 1750 .010"
.014"		 .004"
.006"		 .009"
.011"		 65 ft
lbs		 165
in lbs		 refer
to manual




Flat Head Cast Iron Specs



Basic Model
Series		 Idle
Speed		 Armature
Air Gap		 Valve Clearance Torque
Specs
Intake Exhaust Flywheel
Nut		 Cylinder
Head		 Conn
Rod
230000 1200 .010"
.014"		 .007"
.009"		 .017"
.019"		 145 ft
lbs		 190
in lbs		 190
in lbs
240000 1200 .010"
.014"		 .007"
.009"		 .017"
.019"		 145 ft
lbs		 190
in lbs		 190
in lbs
300000 1200 .010"
.014"		 .007"
.009"		 .017"
.019"		 145 ft
lbs		 190
in lbs		 190
in lbs
320000 1200 .010"
.014"		 .007"
.009"		 .017"
.019"		 145 ft
lbs		 190
in lbs		 190
in lbs