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Overhead-cam design eliminates a few things: pushrods, rockers, adjusters, and their attendant weight. As a result, OHC designs use lower spring pressures--in this case 96 pounds at .400-inch stock--which frees up yet more power. However, ultra-low pressure won't tolerate long duration cams and their higher engine speed levels. For cam swaps, CHRF offers springs in 180-pound rates at .400-inch lift.