179
BIG TWIN
Rocker Box for Evo
Chrome Rocker Box Individual Parts for Evolution Big Twin.
VT No. Item
Fits
43-9127 D-Ring 1984-91
43-9169 D-Ring 1992-99
43-9146 Lower 1984-91
43-9128 Top
1984-91
43-9162 Top
1984-91
43-9170 Top
1992-99
43-9128
43-9170
Chrome Top Cover and D-Ring Set fits 1984-91. Order
gaskets separately.
Chrome Year
43-9178
1984-91
43-0377
1992-99
Evo Big Twin Lower Rocker Box
Mounting Hardware Set incudes
all correct bolts, allen screws and
washers necessary for bolting
lower rocker cover to cylinder head.
Complete set for two heads.
VT No.
U/M
11-0621
Set
2078-18
Each
Chrome Rocker Box Screw Set fits
1985-99 Big Twin.
VT No.
Type
8868-16 Acorn
9788-24
Button Head Allen
Rocker Box Screw Kit for Evo includes
chrome allen screws and washers, and
copper sealing washers.
VT No.
OEM
Item
8931-16 Allen
Screw Kit
15-0663* 63858-49 Fibre Washer, 50 pack
15-0221 6114
Copper Washer
8931-16
“Tru-Seal” Evo Rocker Box Chrome
Cover Collar and Screw Kit includes
sealing washers with built in O-Ring for
position seal.
VT No. 37-0820
43-9178
Screw Set
43-9127
43-9169
43-9146
43-9162
43-0377
Cubic Inch =
πr2 x Stroke
r = ¹⁄₂ of Bore
1 cubic inch = 16.38 cc
1 cubic inch = .0163871 liter
CUBIC INCH CHART
STROKE 3¹⁄₂” 3¹³⁄₁₆ 3.968” 4¹⁄₄”
4¹⁄₂”
4⁵⁄₈”
4³⁄₄”
5.00”
74”
80”
2³⁄₄”
45”
3⁵⁄₁₆”
61”
3⁷⁄₁₆”
64.8”
73.7”
78.7”
83.4”
85.7”
88.0”
92.8”
3¹⁄₂”
67.2”
76.3”
81.6”
86.6”
89.0”
91.4”
96.1”
3⁵⁄₈”
72.1”
81.7”
87.4”
92.9”
95.5”
99.0”
103.2”
3¹¹⁄₁₆”
74.6”
84.7”
90.7”
96.1”
98.8”
101.5”
106.8”
3¹³⁄₁₆”
79.9”
90.6”
97.0”
102.8” 103.7” 108.9”
114.2”
3⁷⁄₈”
82.3”
93.4”
100.1” 100”
108.9” 111.9”
117.8”
4.00”
87.9”
99.7”
106.8” 113.0” 116.1” 119.3”
125.6”
4
¹⁄₈
”
93.4
”
106.0”
113.5”
120.2”
123.5”
126.9”
133.6”
4¹⁄₄”
99.2
”
112.6
” 120.5” 127.6” 131.1” 134.7”
141.8”
B
O
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