25499-53R |
Duration, Intake |
281° |
Duration, Exhaust |
277° |
Intake Lobe C-Line |
103.5° ATDC |
Exhaust Lobe C-Line |
101.5° BTDC |
Lobe Separation |
102.5° |
Overlap |
74° |
Intake Opens |
37° BTDC |
Exhaust Opens |
60° BBDC
Intake Closes |
64° ABDC |
Exhaust Closes |
37° ATDC
Intake Lift |
? |
Exhaust Lift | ? | | |
25499-55R |
Duration, Intake |
307° |
Duration, Exhaust |
290° |
Intake Lobe C-Line |
98.5° ATDC |
Exhaust Lobe C-Line |
97° BTDC |
Lobe Separation |
97.75° |
Overlap |
103° |
Intake Opens |
55° BTDC |
Exhaust Opens |
62° BBDC |
Intake Closes |
72° ABDC |
Exhaust Closes |
48° ATDC |
Intake Lift |
? |
Exhaust Lift | ? |
“A” (25499-59R) |
Duration, Intake |
324° @ .010” |
Duration, Exhaust |
282° @ .010” |
Intake Lobe C-Line |
82° ATDC |
Exhaust Lobe C-Line |
99° BTDC |
Lobe Separation |
90.5° |
Overlap |
122° |
Intake Opens |
80° BTDC |
Exhaust Opens |
60° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.395”? |
Exhaust Lift |
.375”? |
“C” (25499-61R) |
Duration, Front Intake
Duration, Rear Intake |
324° @ .010”
319° @ .010” |
Duration, Exhaust |
282° @ .010” |
Intake Lobe C-Line, F
Intake Lobe C-Line, R |
82° ATDC
84.5° ATDC |
Exhaust Lobe C-Line |
99° BTDC |
Lobe Separation, F
Lobe Separation, R |
90.5°
91.75° |
Overlap, Front
Overlap, Rear |
122°
117° |
Front Intake Opens
Rear Intake Opens |
80° BTDC
75° BTDC |
Exhaust Opens |
60° BBDC |
Intake Closes |
64° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.395”? |
Exhaust Lift |
.375”? |
“E” (25499-62R) |
Duration, Intake |
316° @ .010” |
Duration, Exhaust |
278° @ .010” |
Intake Lobe C-Line |
88° ATDC |
Exhaust Lobe C-Line |
97° BTDC |
Lobe Separation |
92.5° |
Overlap |
112° |
Intake Opens |
70° BTDC |
Exhaust Opens |
56° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.395”? |
Exhaust Lift |
.375”? |
“F” (25499-64R) |
Duration, Intake |
312° @ .010” |
Duration, Exhaust |
278° @ .010” |
Intake Lobe C-Line |
90° ATDC |
Exhaust Lobe C-Line |
97° BTDC |
Lobe Separation |
93.5° |
Overlap |
108° |
Intake Opens |
66° BTDC |
Exhaust Opens |
56° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.395”? |
Exhaust Lift |
.375”? |
|
“H” (25499-66R) |
Duration, Intake |
312° @ .010” |
Duration, Exhaust |
280° @ .010” |
Intake Lobe C-Line |
90° ATDC |
Exhaust Lobe C-Line |
98° BTDC |
Lobe Separation |
94° |
Overlap |
108° |
Intake Opens |
66° BTDC |
Exhaust Opens |
58° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.440” |
Exhaust Lift |
.405” |
“J” (25499-67R) |
Duration, Intake |
312° @ .010” |
Duration, Exhaust |
285° @ .010” |
Intake Lobe C-Line |
90° ATDC |
Exhaust Lobe C-Line |
102.5° BTDC |
Lobe Separation |
96.25° |
Overlap |
106° |
Intake Opens |
66° BTDC |
Exhaust Opens |
65° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
40° ATDC |
Intake Lift |
.395” |
Exhaust Lift |
.395” |
“J” Intake + “K” Exhaust (25499-69R) |
Duration, Intake |
312° @ .010” |
Duration, Exhaust |
280° @ .010” |
Intake Lobe C-Line |
90° ATDC |
Exhaust Lobe C-Line |
98° BTDC |
Lobe Separation |
94° |
Overlap |
108° |
Intake Opens |
66° BTDC |
Exhaust Opens |
58° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
42° ATDC |
Intake Lift |
.395” |
Exhaust Lift | .395” |
“J” Intake + “L” Exhaust (25498-69R) |
Duration, Intake |
312° @ .010” |
Duration, Exhaust |
285° @ .010” |
Intake Lobe C-Line |
90° ATDC |
Exhaust Lobe C-Line |
102.5° BTDC |
Lobe Separation |
96.25° |
Overlap |
106° |
Intake Opens |
66° BTDC |
Exhaust Opens |
65° BBDC |
Intake Closes |
66° ABDC |
Exhaust Closes |
40° ATDC |
Intake Lift |
.395” |
Exhaust Lift |
.395” |
Click here for Harley-Davidson stroker flywheels |
Knuckle, Panhead
1941-54 |
Pan, Shovelhead
1955-71 |
Shovelhead
1972-81 |
45 WL, trike
1937-73 |
74, 80” Flathead
1937-48 |
Sportster
1957-* |
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