Mopar 318/275 HP vs. Chevy 327/275 HP 'L-30'

Got some of the information from 1966 Production Planning {Marine Division}

To combat the 1965 Chevrolet 327/250 HP {Code L-30}.

Chrysler {Marine Division} had a proto-type for the LA Engine using
the 318 size off of the Poly Engine.

The original '318 LA-Marine' was to be rated at 250 Horsepower, utilizing
10.5 - 1 Pistons.

The Camshaft {Solid Lifter = .425" Lift / 248* Duration / 26* Overlap}
and Valve Train Components {Valve Springs = #210 lbs. Valve-Open}
from the 273/235 HP Commando were also utilized for the 1966 318/250 HP 'LA Marine'.

The Cylinder Heads had 10% larger runner-ports, a larger Combustion Chamber
{Open-Shaped with 61.0 CC's} and larger Valves.

Chrysler also took Valves from the early 392 Hemi engines {2.00" Intake and 1.75" Exhaust}
and cut them down to size {1.94" Intake and 1.60" Exhaust} to fit the new LA Engine
Cylinder Heads.

The Cast-Iron X-Shaped Low-Plane Intake from the 273 Commando was also
utilized, but the throttle bore openings were increased in size to 1 11/16".

The Carburetor was a reproduction of the Carter AFB #3447 600 CFM unit
{1 7/16" Primary x 1 11/16" Secondary} which was from the earlier
426 Max-Wedge Cross-Ram engine.