C'est pas pour le hemi mais comme c'est dans le même sujet (en anglais) où j'ai trouvé la formule, je le mets ici.
ça ne concerne que les SB et y'a les derniers paragraphes qui peuvent être intéressants (max lift par exemple).

RV and Commuter (1000 rpm to 4000 rpm, max. HP @ 5000 rpm)
Good fuel economy, medium towing and improved mid-range performance
for every day use. No internal engine modifications are required.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 19400 to 20200 402 to 502 cfm Max. 218 HP
318 2Bbl or FI 19700 to 20500 468 to 585 cfm Max. 254 HP
318 Motorhome 19600 to 20400 468 to 585 cfm Max. 254 HP
318 Trk 70-80 19600 to 20400 468 to 585 cfm Max. 254 HP
318 4Bbl 19600 to 20400 468 to 585 cfm Max. 254 HP
340 68-71 19600 to 20400 501 to 626 cfm Max. 272 HP
340 72-73 19700 to 20500 501 to 626 cfm Max. 272 HP
360 19900 to 20700 530 to 663 cfm Max. 288 HP
360 M-home -77 20100 to 20900 530 to 663 cfm Max. 288 HP
360 LTrk 76-80 20100 to 20900 530 to 663 cfm Max. 288 HP
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 9.5:1 or less, Propane 11.0:1 or less
Exhaust: Stock, dual exhaust, or small tube headers
Fuel Inj.: Factory EFI computers might require modification
Gear Ratio: 3.9:1 or lower (numerically)
Idle: 850 rpm or less
Ignition: Recurved distributor and electronic ignition



Mild Performance (1400 rpm to 4400 rpm, max. HP @ 5400 rpm)
Fair idle, moderate fuel economy, improved mid-range performance
and enough torque for medium/heavy towing. Nice for ski boat.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 20200 to 21000 452 to 559 cfm Max. 246 HP
318 2Bbl or FI 20500 to 21300 526 to 651 cfm Max. 286 HP
318 Motorhome 20400 to 21200 526 to 651 cfm Max. 286 HP
318 Trk 70-80 20400 to 21200 526 to 651 cfm Max. 286 HP
318 4Bbl 20400 to 21200 526 to 651 cfm Max. 286 HP
340 68-71 20400 to 21200 563 to 696 cfm Max. 306 HP
340 72-73 20500 to 21300 563 to 696 cfm Max. 306 HP
360 20700 to 21500 596 to 737 cfm Max. 324 HP
360 M-home -77 20900 to 21700 596 to 737 cfm Max. 324 HP
360 LTrk 76-80 20900 to 21700 596 to 737 cfm Max. 324 HP
360 w/2.02 20500 to 21300 596 to 737 cfm Max. 324 HP
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 8.5:1 to 10.0:1, Propane 10.0:1 to 11.5:1
Exhaust: Stock dual exhaust or small tube headers
Fuel Inj.: Factory EFI computers will require modification
Gear Ratio: 3.1:1 to 4.1:1
Idle: 900 rpm or less, slight lope
Ignition: Recurved distributor and electronic ignition



Performance (1800 rpm to 4800 rpm, max. HP @ 5800 rpm)
Good upper mid-range performance.
Works well for medium and heavy towing with low (high numerically) gears.
Good for jet boat and skiing. Biggest for I/O boat.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 21000 to 21800 504 to 617 cfm Max. 273 HP
318 2Bbl or FI 21300 to 22100 587 to 718 cfm Max. 318 HP
318 Motorhome 21200 to 22000 587 to 718 cfm Max. 318 HP
318 Trk 70-80 21200 to 22000 587 to 718 cfm Max. 318 HP
318 4Bbl 21200 to 22000 587 to 718 cfm Max. 318 HP
340 68-71 21200 to 22000 627 to 768 cfm Max. 340 HP
340 72-73 21300 to 22100 627 to 768 cfm Max. 340 HP
360 21500 to 22300 664 to 813 cfm Max. 360 HP
360 M-home -77 21700 to 22500 664 to 813 cfm Max. 360 HP
360 LTrk 76-80 21700 to 22500 664 to 813 cfm Max. 360 HP
360 w/2.02 21300 to 22100 664 to 813 cfm Max. 360 HP
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 9.0:1 to 10.5:1, Propane 10.5:1 to 12.0:1
Exhaust: Dual exhaust, headers are recommended
Fuel Inj.: Performance EFI system recommended
Gear Ratio: 3.3:1 to 4.3:1
Idle: 950 rpm or less, small lope
Ignition: Recurved or perf. distributor, electronic ignition



Hot Performance (2200 rpm to 5200 rpm, max. HP @ 6200 rpm)
Strong upper rpm performance. Not for towing.
Good in jet boat with A impeller. Biggest for skiing.
Multi-angle valve grind is recommended.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 21800 to 22600 557 to 674 cfm Max. 300 HP
318 2Bbl or FI 22100 to 22900 649 to 785 cfm Max. 350 HP
318 4Bbl 22000 to 22800 649 to 785 cfm Max. 350 HP
340 68-71 22000 to 22800 694 to 840 cfm Max. 374 HP
340 72-73 22100 to 22900 694 to 840 cfm Max. 374 HP
360 22300 to 23100 735 to 889 cfm Max. 396 HP
360 LTrk 76-80 22500 to 23300 735 to 889 cfm Max. 396 HP
360 w/2.02 22100 to 22900 735 to 889 cfm Max. 396 HP
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 9.5:1 to 11.0:1, Propane 11.0:1 to 12.5:1
Exhaust: Dual exhaust with headers
Fuel Inj.: Performance EFI system required
Gear Ratio: 3.5:1 to 4.5:1
Idle: 1000 rpm or less, has a lope
Ignition: Recurved or perf. distributor, electronic ignition



Street/Strip (2600 rpm to 5600 rpm, max. HP @ 6600 rpm)
Strong performance above 2500 rpm. Expect low manifold vacuum.
Mild port work and multi-angle valve grind are recommended.
Automatic transmissions may require a high stall torque converter.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 22600 to 23400 612 to 732 cfm Max. 328 HP
318 2Bbl or FI 22900 to 23700 713 to 852 cfm Max. 382 HP
318 4Bbl 22800 to 23600 713 to 852 cfm Max. 382 HP
340 68-71 22800 to 23600 762 to 911 cfm Max. 408 HP
340 72-73 22900 to 23700 762 to 911 cfm Max. 408 HP
360 23100 to 23900 807 to 965 cfm Max. 432 HP
360 LTrk 76-80 23300 to 24200 807 to 965 cfm Max. 432 HP
360 w/2.02 22900 to 23700 807 to 965 cfm Max. 432 HP
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 10.0:1 to 11.5:1, Propane 11.5:1 to 13.0:1
Exhaust: Dual exhaust with headers
Fuel Inj.: Performance EFI system required
Gear Ratio: 3.7:1 to 4.7:1
Idle: 1100 or less, has a lope
Ignition: Performance distributor and electronic ignition



Pro Street and Race (3000 rpm and up)
Super top-end performance. Manifold vacuum might be too low for
power brakes and automatic transmission modulators. Mild port work
and multi-angle valve grind are recommended. NOT for daily driving.
Automatic transmissions will require a high stall torque converter.
Engine: Cam Range* Air/Fuel Range: Horsepower:
273 23400 and up 668 cfm and up 328 HP and up
318 2Bbl or FI 23700 and up 778 cfm and up 382 HP and up
318 4Bbl 23600 and up 778 cfm and up 382 HP and up
340 68-71 23600 and up 831 cfm and up 408 HP and up
340 72-73 23700 and up 831 cfm and up 408 HP and up
360 23900 and up 880 cfm and up 432 HP and up
360 LTrk 76-80 24100 and up 880 cfm and up 432 HP and up
360 w/2.02 23700 and up 880 cfm and up 432 HP and up
*The cam range refers to the 2nd half of
the Accelerated Motion part number.
Compression: Gasoline 10.5:1 and up, Propane 12.0:1 and up
Exhaust: Dual exhaust with headers
Fuel Inj.: Race EFI system required
Gear Ratio: 3.9:1 and higher (numerically)
Idle: 1100 rpm or more, will be rough
Ignition: Performance distributor and electronic ignition



Which Cam Duration In The Range Will Work Best?
Cars (large): Use short or medium duration, exhaust can be longer.
Cars (small): Use long intake duration, exhaust can be longer.
Propane: Use short or medium duration, exhaust can be shorter.
Trucks: Use short duration for intake and exhaust.
Turbos: Use short or medium duration, exhaust can be shorter,
and lower compression than shown.

How Much Lift Is Enough?
273 gets the best flow past the valves at only .455 lift.
318 2Bbl and FI get the best flow past the valves at only .455 lift.
318 Motorhome gets the best flow past the valves at .463 lift.
318 Truck 70-80 gets the best flow past the valves at .463 lift.
318 4Bbl gets the best flow past the valves at .480 lift.
340 68-71 gets the best flow past the valves at .515 lift.
340 72-73 gets the best flow past the valves at .480 lift.
360 gets the best flow past the valves at .480 lift.
360 Motorhome -77 gets the best flow past the valves at only .415 lift.
360 Motorhome 78-up gets the best flow past the valves at .463 lift.
360 L Truck 76-80 gets the best flow past the valves at only .415 lift.
360 M Truck 76-81 gets the best flow past the valves at .463 lift.
360 with 2.02 heads gets the best flow past the valves at .515 lift.
Lifts higher than these figures will add more duration at the maximum
flow point. Excessive lifts will cause more problems than they are
worth in an engine that is not fully race prepared.