Matt, the engine # is 427SR-460 the spec sheet from Rouch is not exactly clear. The RPM start at 3,000 and goes up. There is a Torque, lbft column and a CTorq C_FtLb column. At 3,000 RPM the Torque is 457.4 lbft and the CTorq is 478.5 C_FtLb. The CTorq peaks at 524 @ 4,400 RPM. I can fax or email a scan if you send me a fax # or email address.