Pontiac Ram Air V Specs
The Ram Air V was the rarest of the "Ram Air" options available from Pontiac in the late 1960s and early 1970s. For a relatively small cost at the dealership, you could order a Ram Air V performance package to significantly boost the horsepower and torque output of your vehicle. The high-flow cylinder heads and aggressive camshaft of the engine made the option a secret weapon in the racing world.
Bore and Stroke
The bore of the Ram Air V engine was approximately 4.12 inches. The bore is measured as the distance from cylinder wall to cylinder wall. The stroke of the engine was 3.75 inches. The stroke is the distance the connecting rod travels vertically inside the cylinder.
The Ram Air V engine was built on the Pontiac 400, which was first introduced by Pontiac in 1967. The displacement of the Ram Air is approximately 400 cubic inches, or 6.5 liters. The engine is a V-8 configuration.
The increased airflow of the Ram Air V heads allowed the 400 cubic inch engine to produce 425 horsepower. Due to the amount of power the engine produced, the Ram Air V engine was not a factory installed motor.
The Pontiac Ram Air V was a "high-compression" motor, using a 11:1 compression ratio to achieve significant power gains. The compression ratio is the ratio between the volume of the cylinder when the piston is at its highest and lowest points.
The Ram Air V used an overhead valve system with two valves per cylinder. One valve was devoted to letting air into the cylinder via the cylinder head, and one valve allowed exhaust to leave the engine through the exhaust ports.