Lookat my previous post regarding ALDA adjustment. The right way is on a test stand but the test conditions I described are tried and true. If you follow it you will be very very close to a bench set pump tuned for good performance.

Bob D.
83 300SD
84 300SD

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Bob D.
Parrish, FL
1 SDL, 1 D, 1 TD, 1 Mog