Not Ranked
I'm new here, but I have the 1850 600 vac sec on my 427 Windsor and on the dyno they made more power and torque than the 450's, even at 2500 rpm. I looked at it like Barry R, when you step on it, only the primaries of both open so it's like a 600 DP. You can then adjust the secondaries to come in from there. HTH's
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