Marine 273 build

273 {Automotive Horsepower Numbers}

273/180 HP.......................8.8-1 Compression {Flat Top Pistons} ~ 2-Barrel
Camshaft {Solid}..............{.400" Intake / .411" Exhaust ~ 240* Duration ~ 20* Overlap}
Valve Springs....................{#83 lbs. Valve-Closed ~ #177 lbs. Valve-Open}
Horsepower {actual}........165 HP

273/200 HP.....................8.8-1 Compression {Flat Top Pistons} ~ 4-Barrel
Camshaft {Solid}............{.400" Intake / .411" Exhaust ~ 240* Duration ~ 20* Overlap}
Valve Springs..................{#83 lbs. Valve-Closed ~ #177 lbs. Valve-Open}
Horsepower {actual}........185 HP

273/235 HP 'Commando'... 10.5-1 Compression {Dome Piston} ~ 4-Barrel
Camshaft {Solid}.............{.425" Intake / .425" Exhaust ~ 248* Duration ~ 26* Overlap}
Valve Springs...................{#98 lbs. Valve-Closed ~ 210 lbs. Valve-Open}
Horsepower {actual}........215 HP