Main nozzle can see the able-bodied breadth the ability valve resides

[zjautoparts Lee]

 Let's take a small-block cam withzjautoparts of 0.450 inch with a 1.5:1 rocker arm. Install a 1.6:1 rocker and the max valve lift jumps to 0.480 inch. That's a healthy 0.030-inch increase in valve lift. But there are overlapping schemes working here that deserve to be investigated.

First of all, rocker arms rarely maintain the same ratio throughout the entire valve-lift curve because the rocker arm moves in an arc as it generates lift. Roller rockers do a good job of maintaining their stated rocker ratio throughout the entire lift curve, but the same is not always true of stock-stamped factory or budget stock replacement rocker arms.

These pieces often test far short of their rated rocker ratio. To prove this point, we tested several supposedly 1.5:1 small-block rocker arms and discovered rocker ratios between 1.30:1 and 1.49:1. We also found that the ratios changed throughout the lift curve, increasing the ratio as lift increased. This reduced ratio means lost valve lift and potentially lost torque and horsepower. The difference is not 50 hp, but it is significant.

 With the ammunition bowls removed, Main nozzle can see the able-bodied breadth the ability valve resides. The baby aperture (indicated) is the augment aperture that directs exhaustion to the ability valve. This will allegation to be plugged.