Related Photo Galleries
The flat 6-degree valve angle of the Olds' head results in a valve face that's nearly parallel to the deck surface, and a small 77cc fast-burn chamber. Likewise, the oval-shaped chambers yield dual quench pads, one on each side of the valves. Edelbrock has also repositioned the spark plug closer to the exhaust valve, and angled it at 45 degrees to improve burn efficiency. Not surprisingly, the 461 made maximum power with just 32 degrees of timing advance on the dyno.