Profile
Number

Advertised Timings

DURATION

VALVE LIFT

TAPPET
CLEARANCE

REMARKS

Ex Op.
B.B.D.C.

Ex Cl
A.T.D.C

In Op.
B.T.D.C.

In Cl
A.B.D.C

Advertised

@ 0.050”

Gross.

@ T.D.C.

Ex.

In.

619A

47

7

8

40

234

228

0.318

0.318

0.008”

0.006”

Standard

549C

39

11

9

41

230

230

0.340”

0.340”

0.008”

0.006”

619B

54

14

18

50

248

248

0.320”

0.320”

0.008”

0.006”

750A

51

21

21

51

252

252

0.352”

0.352”

0.008”

0.006”

Fast road

750B

61

31

31

61

272

272

0.352”

0.352”

0.008”

0.006”

Road race

703C

69

40

43

67

290

290

0.385”

0.385”

0.008”

0.006”

Drag