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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. | | |||||
706 | 56 | 20 | 20 | 56 | 256 | 256 | 200 | 200 | .400" | .400" | .010" | .008" | Marine (Std). | ||
821 | 66 | 18 | 18 | 66 | 264 | 264 | 214 | 214 | .340" | .340" | .010" | .008" | |||
628 | 69 | 21 | 29 | 61 | 270 | 270 | 210 | 210 | .325" | .325" | .010" | .008" | 323 Factory sport. | ||
628C | 74 | 26 | 34 | 66 | 280 | 280 | 218 | 218 | .325" | .325" | .010" | .008" | |||
693 | 74 | 30 | 30 | 74 | 284 | 284 | 221 | 221 | .362" | .362" | .012" | .010" | |||
614C | 74 | 26 | 34 | 66 | 280 | 280 | 222 | 222 | .370" | .370" | .010" | .008" | Sporty 2500-6500 rpm. | ||
741C | 79 | 31 | 39 | 71 | 290 | 290 | 230 | 230 | .370" | .370" | .010" | .008" | Sporty 2800-7000 rpm. | ||
930C | 75 | 35 | 35 | 75 | 290 | 290 | 234 | 234 | .375" | .375" | .010" | .008" | Factory GRP A. | ||
931 | 79 | 37 | 37 | 79 | 296 | 296 | 225 | 225 | .345" | .345" | .012" | .008" | Fast street 3500-7500 rpm. | ||
1037 | 78 | 42 | 42 | 78 | 300 | 300 | 252 | 252 | .450" | .450" | .010" | .008" | Road race only. | ||
521A | 80 | 45 | 47 | 78 | 305 | 305 | 258 | 258 | .452" | .452" | .012" | .008" | Road race only. |
Notes -
- Valve springs must be changed over .450" lift.
- All regrind improved cams must be hardfaced.
- New camshafts available for most models.