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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. | | |||||
370 | 70 | 18 | 24 | 64 | 268 | 268 | .375" | .375" | .012" | .008" | Std. 2 litre. | ||||
595 | 70 | 18 | 24 | 64 | 268 | 268 | .423" | .423" | .012" | .008" | High lift std. | ||||
777 | 75 | 23 | 29 | 69 | 278 | 278 | .375" | .375" | .012" | .008" | Mild steel carb. | ||||
778 | 75 | 23 | 29 | 69 | 278 | 278 | .423" | .423" | .012" | .008" | |||||
924 | 75 | 35 | 35 | 75 | 290 | 290 | .423" | .423" | .012" | .008" | fast road 3200-7500 rpm. | ||||
382C* | 68 | 41 | 42 | 66 | 289 | 289 | .390" | .390" | .014" | .012" | 4000-8000 rpm (twin carb.) | ||||
442C* | 68 | 41 | 42 | 66 | 289 | 289 | .450" | .450" | .014" | .012" | Narrow band strong power. | ||||
989* | 74 | 41 | 37 | 75 | 295 | 292 | 260 | 240 | .475" | .475" | .014" | .012" | Factory rally. | ||
949* | 74 | 41 | 37 | 75 | 295 | 292 | 254 | 245 | .425" | .425" | .014" | .012" | Fast road twin carb. only. | ||
S/M* | 87 | 47 | 47 | 87 | 314 | 314 | 262 | 262 | .504" | .504" | .014" | .012" | Good road/ race special. | ||
Notes -
- Care must be taken with spring tension - recommended seat tension - 75-80lbs.
- Vernier cam gears available.
- Take great care on initial start-up as cams are prone to excessive wear.
- Valve springs must be changed.