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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. | | |||||
456 | 60 | 20 | 12 | 66 | 260 | 258 | 191 | 191 | .406" | .406" | H | H | Std. pre -pollution. | ||
300BT | 65 | 15 | 20 | 60 | 260 | 260 | 296 | 196 | .450" | .450" | H | H | Towing/ torque. | ||
422A | 64 | 60 | 24 | 60 | 264 | 264 | 208 | 208 | .475" | .475" | H | H | Highway/ mid range. | ||
310 | 68 | 20 | 28 | 60 | 268 | 268 | 212 | 212 | .515" | .515" | H | H | Mild road. | ||
768 | 70 | 30 | 30 | 70 | 280 | 280 | 217 | 217 | .500" | .500" | H | H | Boss. | ||
343 | 75 | 20 | 30 | 70 | 275 | 280 | 218 | 220 | .500" | .500" | H | H | Phase #1 G.TH.O. | ||
594 | 71 | 23 | 31 | 63 | 274 | 274 | 225 | 225 | .530 | .530" | H | H | 2300-5500 rpm. | ||
599 | 86 | 38 | 32 | 80 | 304 | 242 | 228 | 214 | .447" | .450" | H | H | Fast street. | ||
726 | 67 | 31 | 31 | 67 | 278 | 278 | 229 | 229 | .530 | .530 | H | H | Fast street 3200-6000 rpm. | ||
727 | 81 | 45 | 45 | 81 | 306 | 306 | 235 | 235 | .530" | .530" | H | H | 3000-6000 rpm. | ||
608C | 76 | 38 | 76 | 38 | 294 | 294 | 232 | 232 | .550" | .550" | H | H | 3800-6500 rpm. | ||
1001 | 81 | 39 | 42 | 78 | 300 | 300 | 244 | 234 | .562" | .588" | H | H | S.V.O Boss 3750-7200 rpm. | ||
Notes -
- Cams larger than listed we recommend using solid lifters.
- Valve springs require special attention to achieve high rpm.
- Fluted lifters are recommended for larger profiles.
- Anti pump-up lifters are not recommended.