2026 KPMI Full Catalog V1 - Flipbook - Page 58
HD SHOVELHEAD 80" 1978-1983
®
™
HARLEY-DAVIDSON
Valve Spring Kit • Lightweight Racing
Type
Max Valve Lift Installed Height Seat Pressure
Intake
.600”
1.510"
152#
20-21100
Exhaust
4
H.A. 7075-T6 Retainers
4
Kit Includes
4
CrSi Valve Springs
4
Open Pressure
@ Lift
387#
.600"
KPMI P/N
Type
Seat Pressure
Open Pressure
@ Lift
*20-21150
Intake
Exhaust
152#
387#
.600"
KPMI P/N
Max Valve Lift Installed Height
.600”
1.510"
H. T. Steel Keepers Pr.
H. T. Steel Basewashers
4
H. T. Steel Retainers
4
H. T. Steel Keepers Pr.
4
CrSi Valve Springs
4
H. T. Steel Basewashers
*All KPMI® retainers are designed using the latest CAD software available. Further, the retainers are tested using 昀椀nite element analysis (FEA) to ensure the
retainer can endure high stress levels during operation. By using billet aircraft alloy material, heat treating it, and then employing our high powered design software,
KPMI® is able to maximize weight saving by incorporating a series of drilled holes in the retainers. These retainers are both strong and light, allowing signi昀椀cant
reduction to overall valvetrain mass, which is known to improve performance. Retainer o昀昀set 0.070” for taller installed height. Basewashers counter-bored to accept
a 0.720” OD seal. Basewasher 昀椀ts over 0.625” guide top.
Kit Includes
Valve Spring Kit • O. E. M. Replacement
KPMI P/N
Type
H. T. Steel
Retainers
H. T. Steel
Keepers Pr.
Kit Includes
CrSi Valve
Springs
H. T. Steel
Basewashers
Intake
4 20-20851 4 20-20857 4
4 20-20855
20-20853
Exhaust
Max Valve Lift
Installed Height
Seat Pressure
Open Pressure
@ Lift
.415”
1.375"
129#
272#
.415"
All KPMI® retainers are designed using the latest CAD software available. Further, the retainers are tested using 昀椀nite element analysis (FEA) to ensure the retainer
can endure high stress levels during operation. By using billet aircraft alloy material, heat treating it, and then employing our high powered design software, KPMI®
is able to maximize weight saving by incorporating a series of drilled holes in the retainers. These retainers are both strong and light, allowing signi昀椀cant reduction
to overall valvetrain mass, which is known to improve performance. All components are the quality you can expect from KPMI®, manufactured to exact O.E.M.
dimensions. These O.E.M. replacements parts may be purchased separately using the above part numbers.
20-20850
Engine Kit with O. E. M. Replacement Spring Kit
KPMI P/N
20-22550
Type
Max Valve Lift Installed Height Seat Pressure Open Pressure
Intake
.415”
Exhaust
Kit Includes
1.375"
129#
272#
@ Lift
.415”
4
In / Ex H. T. Steel Retainers
4
In / Ex H.T. Steel Keeprs Pr.
4
In / Ex CrSi Valve Springs
4
In / Ex H. T. Steel Basewashers
4
In/ Ex OEM Replacement Seals
In Std. Black Diamond™ Valves
2
Ex Std. Black Diamond™ Valves
2
Components • Replacement • Engine Kit
KPMI P/N
Description
20-20850
71036-4
20-4194
20-4195
Spring Kit, OEM Replacement
Speci昀椀cation
Includes: H. T. Steel Retainers, CrSi Valve Springs, H.T. Steel Basewashers, H.T. Steel Keeprs
Intake / Exhaust Seal
Seal • OEM Replacement
Intake, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
Exhaust, Standard Valve
Valve • Black Diamond™ • Black Nitroneg Stems
Valve Kit • Black Diamond™ • Black Nitroneg Stems
KPMI P/N
20-22500
Type
Tulip
Stem
Diameter
Radius
Angle
O. L.
Remarks
Intake
1.950"
49.53mm
0.3765"
R0.234
23°
3.885”
Standard
Exhaust
1.750”
44.45mm
0.3760"
R0.234
29°
3.810"
Standard
Kit Includes
40
order 650-557-2046
Head Diameter
2
In Std. Black Diamond™ Valves
2
Ex Std. Black Diamond™ Valves
