360 driver build

Because it's all about velocity, not bigger is better. On a street car that rarely sees over 5500 RPM, you'll never feel the difference in the 1.88 VS 2.02 valves, because there won't be any. In fact, in certain instances, you can actually hurt flow because the head cannot flow enough to match the valve size. The larger valve can actually slow the mixture down resulting in less cylinder filling. In fact, Larry Shepard and the boys in R&D at Mopar Performance did dyno testing on a stock 340. They actually found that low end power and torque picked up when they swapped out the bigger valve heads for the smaller valve. They found that it was because of the difference in velocity with the large valve at low engine speeds. The larger valve actually made the engine less efficient under a certain RPM. Course we all know the 340 likes to rev like a bumble bee, so the 2.02s were in their element. But for a mild 360 or even a 340, I would use the 1.88 heads real quick.