You can send the factory core to Oregon to get reground. More often than not, the factory 360 core is on a 110 or 109, so Ken can usually tighten it up to a 108 or 107. Maximum lobe lift that can be ground on a stock core is usually around .335, so about .500 with stock rockers and upgraded valve springs. The roller 360 also has 308 heads, high volume oil pump, double roller timing set, and a windage tray.