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Rob;
I would be interested to know what your L72 idle vacuum is, and what PV you're running up front (blocked rear, correct?).
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Running a 65 up front with a plug in the rear...my notebook says my usual setup for Stanton is:
<font class="small">Code:</font><hr /><pre> Front
/ \
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71 | 70
-------
85 | 82
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I bumped it up +2 for the thicker in Virginia last fall, but the crazy high humidity killed it...as for vacuum, for some reason I can't find where I'd written it down, but I'm 99% positive it was over 12 @ idle...the only reason I remember it is, it was nearly identical to Stefina's R-code 427 [both in engine specs and vacuum readings].