'A-Body Showdown' ~ 1967 Dart GT 273/235 HP vs. 1968 Dart GT 318/230 HP

RB Dart,

Correct

273/235 HP
* 10.5 - 1 Compression {Step-Dome Piston}
* Cylinder Head > #2685920 ~ 57.3 CC {Closed Chamber}
* Valves > 1.78" Intake / 1.50" Exhaust
* Camshaft = .425"/.425" Lift ~ 248*/248* Duration ~ 20* Overlap
* Solid Lifter
* Valve Springs > #98 lbs. Valve Closed ~ #210 lbs. Valve Open
* Cast Iron Intake - 4-Barrel
* Carter AFB - 500 CFM {1.437" x 1.563" Throttle Bores}
* Dual-Point Distributor
* 'Special' Single 'Y-Pipe' Exhaust = 2.50"
* 'Special' Low-Restriction Muffler {2.25" Inlet / 2.25" Outlet}
* 'Special' Resonator {18" Length}
* 4-Speed A-833
* 3.91 Gears w/Sure-Grip {Available option w/4-Speed}

* Factory Rating > 235 HP @ 5200 RPM ..... 280 Ft/Lbs. of Torque @ 4000 RPM

* The NHRA 're-factored' the 273/235 HP 'down' to 210 HP.


318/230 HP
* 9.2-1 Compression {Flat-Top}
* Cylinder Head > #2843675 ~ 60.3 CC {Open Chamber}
* Valves > 1.78" Intake / 1.50" Exhaust
* Camshaft > .373"/.400" Lift ~ 240*/248* Duration ~ 20* Overlap
* Hydraulic Lifter
* Valve Springs > #103 lbs. Valve Closed ~ #144 lbs. Valve Open
* Cast Iron Intake - 2-Barrel
* Carter BBD - 285 CFM {1.44" Throttle Bore}
* Single-Point Distributor
* Single-Pipe Exhaust ~ 1.80"
* Muffler {2.00" Inlet / 1.80" Outlet}
* 3.91 Gears w/Sure-Grip {Available with 4-Speed}

* Factory Rating > 230 HP @ 4400 RPM ..... 340 Ft/Lbs. of Torque @ 2400 RPM

* The NHRA 're-factored' the 318/230 HP 'down' to 185 HP.