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Alternate Harley-Davidson Cams for the 45

    The following Andrews cams are listed for big twin (1936-* OHV knucklehead, panhead, shovelhead), but are directly transposable to Sportster blanks for use in a suitably modified 45 since the roller tappet diameters are identical at .855”.
    These figures are not suggestions, but merely possibilities. Many, many alternates exist, and there is no practical method to predict in advance which cam, or event position, will produce what results in your engine.

Andrews Products Big Twin Cams, adapted for 45 or K

Cam grind

Intake @ .020”

Exhaust @ .020”

Duration @ .020”

Overlap
(degrees)

Lobe center
(degrees)

Lobe sep. angle
(degrees)

Lobe height
(45 or K lift)

Int./Exh. bias
(degrees)

Int.

Exh.

Open BTDC

Close ABDC

Open BBDC

Close ATDC

Int.

Exh.

Int.

Exh.

Int. (inches)

Exh. (inches)

2

N int.

40°

68°

59°

31°

288°

270°

71°

104°

104°

104°

.341”

.348”

18°

N exh.

40°

68°

64°

32°

288°

276°

72°

104°

106°

105°

.348”

12°

2

40°

68°

59°

49°

288°

288°

89°

104°

95°

99.5°

.341”

0°

3

N int.

55°

69°

59°

31°

304°

270°

86°

97°

104°

100.5°

.360”

.348”

34°

N exh.

55°

69°

59°

37°

304°

276°

92°

97°

101°

99°

.348”

28°

2

55°

69°

62°

46°

304°

288°

101°

97°

98°

97.5°

.341”

16°

S

N int.

58°

70°

59°

31°

308°

270°

89°

96°

104°

100°

.370”

.348”

38°

N exh.

58°

70°

59°

37°

308°

276°

95°

96°

101°

98.5°

.348”

32°

2

58°

70°

62°

46°

308°

288°

104°

96°

98°

97°

.341”

20°

3

58°

70°

72°

52°

308°

304°

110°

96°

100°

98°

.360”

4°

M

N int.

62°

67°

59°

31°

309°

270°

93°

92.5°

104°

98.25°

.413”

.348”

39°

N exh.

62°

67°

59°

37°

309°

276°

99°

92.5°

101°

96.75°

.348”

33°

2

62°

67°

62°

46°

309°

288°

108°

92.5°

98°

95.25°

.341”

21°

3

62°

67°

72°

52°

309°

304°

114°

92.5°

100°

96.25°

.360”

5°

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