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| Profile Number |
Advertised
Timings |
DURATION |
VALVE
LIFT |
TAPPET CLEARANCE |
REMARKS |
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| 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. |
|
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| 112 | 60 | 20 | 20 | 60 | 260 | 260 | 211 | 211 | 0.423" | 0.423" | 0.026" | 0.030" | 0.014" | 0.012" | Bottom end |
| 113 | 65 | 25 | 25 | 65 | 270 | 270 | 207 | 207 | 0.400" | 0.400" | 0.027" | 0.033" | 0.014" | 0.012" | 2000 - 5000 RPM |
| 104 | 65 | 25 | 25 | 65 | 270 | 270 | 215 | 215 | 0.423" | 0.423" | 0.038" | 0.048" | 0.014" | 0.012" | Strong Midrange |
| 240 | 70 | 30 | 30 | 70 | 280 | 280 | 218 | 218 | 0.423" | 0.423" | 0.040" | 0.053" | 0.014" | 0.014" | Mild |
| 154 | 71 | 25 | 31 | 70 | 276 | 281 | 216 | 227 | 0.398" | 0.398" | 0.033" | 0.054" | 0.014" | 0.012" | Midrange |
| 424 | 71 | 25 | 31 | 70 | 276 | 281 | 226 | 235 | 0.450" | 0.450" | 0.043" | 0.062" | 0.014" | 0.012" | Rally (PRC) |
| 140 | 70 | 37 | 37 | 71 | 287 | 288 | 240 | 240 | 0.488" | 0.488" | 0.072" | 0.091" | 0.014" | 0.014" | Nice twin carbs / Fast road |
| 150A | 71 | 40 | 40 | 71 | 291 | 291 | 240 | 240 | 0.474" | 0.474" | 0.065" | 0.095" | 0.014" | 0.014" | Fast road 2750 - 6500 RPM |
| 474 | 83 | 31 | 43 | 72 | 294 | 298 | 234 | 244 | 0.415" | 0.426" | 0.012" | 0.012" | Fast road 3000 - 8000 RPM | ||
| 439C | 84 | 48 | 50 | 82 | 312 | 312 | 252 | 252 | 0.442" | 0.442" | 0.014" | 0.012" | Speedway | ||
| 413 | 85 | 41 | 45 | 81 | 306 | 306 | 259 | 259 | 0.435" | 0.435" | 0.014" | 0.012" | 4000 - 9500 RPM | ||
Notes -
* Valve springs require changeing over 0.400".
* Cam followers must be refaced before fitting new camshaft.
