2026 KPMI Full Catalog V1 - Flipbook - Page 43
HD FLATHEAD 1930-1973
®
™
KPMI P/N
Kit Includes
Type
H. T. Steel Retainers
Intake
20-20480
CrSi Valve Springs
Exhaust
H. T. Steel Keepers Pr.
20-20481
4
H. T. Steel Basewashers
20-20483
4
20-20489
4
H. T. Steel Shims
20-20485
4
4
20-20487
Max Valve Lift
Installed Height
Seat Pressure
Open Pressure
@ Lift
.375”
2.125"
65#
130#
.375"
Harley-DaviDson
Valve Spring Kit • O. E. M. Replacement for 74" - 80" Flathead 1930-1948
Some models may require shim# 20-20487 to achieve recommended installed height. All components are the quality you can expect from Kibblewhite®,
manufactured to exact O.E.M. dimensions. These O.E.M. replacements parts may be purchased separately using the above part numbers.
Valves • Black Diamond™ • Black Nitroneg Stems
KPMI P/N
Head Diameter
Stem
Diameter
Tulip
Radius
Angle
O. L.
Remarks
1.625” 41.28mm
0.3395”
R0.540
R 0.540
5.585”
45" Standard
1941-1973
1.930" 49.02mm
0.3715”
R0.325
7º
6.280”
UL 74”-80”
2.050" 52.07mm
0.3715”
R0.325
7º
6.280”
UL 74”-80”
1.930" 49.02mm
0.3715”
R0.325
7º
5.940”
VL 74”-80”
2.050" 52.07mm
0.3715”
R0.325
7º
5.940”
VL 74”-80”
Type
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
Intake
Exhaust
20-20740
20-20742
20-20743
20-20744
20-20745
Valve Guides • Cast Iron For 45" Flathead 1941-1973
A
B
C
D
E
1.200"
1.330"
1.310"
1.470"
0.855"
F
G
Intake
Exhaust
20-20750
20-20751
20-20752
20-20759
0.3395" 0.5647" / Std.
+0.001”
+0.002”
+0.010”
Valve Guides • Cast Iron For 74"- 80" Flathead 1930-1948
A
B
C
D
E
1.120"
1.275"
1.630"
1.860"
0.935"
F
G
Intake
0.3715" 0.5952" / Std.
+0.001”
+0.002”
+0.010”
Exhaust
20-20760
20-20761
20-20762
20-20769
For sizing KPMI® Cast Iron Valve Guides please use Reamers and Ball Hones listed in HD® Tool section (Pg.90-93).
HD KNUCKLEHEAD 1936-1947
®
™
Valve Spring Kit • Lightweight Racing
KPMI P/N
Type
Max Valve Lift Installed Height
Seat Pressure Open Pressure
@ Lift
Intake
20-20170
.480”
1.310"
158#
340#
.480"
Exhaust
4
H. T. Steel Retainers
4
H. T. Steel Keepers Pr.
4
CrSi Valve Springs
4
H. T. Steel Shims
Spring kit must be used with Kibblewhite® guides, or the tops of your guides must be machined to use this kit. Retainers manufactured from heat treated, aircraft
quality, steel billet. FEA stress analysis used to incorporate unique concave radius, and design equidistant holes to lighten retainer without sacri昀椀cing strength.
Black Oxide treatment applied to resist corrosion. Machining Instructions included with kit, or check our website www.kpmi.us for current info.
Visit us at www.kpmi.us
25
Kit Includes
