318 hp question

Johnny,

'Here Tis'

1968 ~ '318/230 HP'_____________________________________________1972 ~ '318/150 HP'

* Compression Ratio ......... 9.00-1 ......................................................................... 9.23-1
* Piston Type.................... Flat Top ....................................................................... Flat Top
* Piston Height................. {-.029"} Below Deck ..................................................... {-.056"} Below Deck
* Gasket.......................... .020"............................................................................ 036"
* Cylinder Head................ #2843675 .................................................................... #2843675
* Combustion Chamber...... 60.6 CC {Open Chamber} .............................................. 61.0 CC {Open Chamber}
* Valves.......................... 1.78" Intake ~ 1.50" Exhaust........................................... {same}
* Camshaft 'Hydraulic'...... .390"/.420" Lift ~ 240*/248* Duration ~ 20* Overlap ......... {same}
* Valve Springs................ #108 lbs. Valve-Closed ~ #148 lbs. Valve-Open.................. {same}
* Intake Manifold............. #2468960 ..................................................................... #2951185
* Carburetor.................... Carter BBD #4420 ~ {275 CFM} ~ 1 7/16" Throttle Plates ... Carter BBD #6149 {285 CFM}
* Exhaust Manifold Outlet... 1.75" ........................................................................... {same}

Mopar Advertised Specifications
* 230 Horsepower @ 4400 RPM's ....................................................................... 150 Horsepower @ 4000 RPM's
* 340 Ft/Lbs. of Torque @ 2400 RPM's............................................................... 260 Ft/Lbs. of Torque @ 1600 RPM's

NHRA 'Refactored' Horsepower Rating per Year
* 1968....... 230 HP
* 1978....... 210 HP
* 1985....... 200 HP
* 2002....... 195 HP
* 2004 ...... 185 HP
* 2012....... 172 HP