Not Ranked
I looked at both the 427R and 427SR and found Hp-Torque curves on the Roush web site (I believe) a couple of years ago. If I recall correctly, the 427 R peaks at higher HP and torque values than the 427 SR. On the other hand, the 427 SR has a flatter torque curve than the 427 R which appealed to me. I've driven both, bought the 427 SR and have enjoyed it ever since. If you like some HP-Torque curves, I have 2 sets taken from Roush dyno sheets for 427 SR's #633 and #634 (mine). Email me and I'll send them. (Don't know how to post them)
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