I have a 12.5:1 SBC with an MSD 6530. Going to a 7530.
Distributor is locked at 40 degrees BTDC. I pull 25 degrees out to crank it with the 6530. So it's cranking on 15 degrees BTDC.
From 1000 to 2200 rpm, I put the 40 degrees back in, so that it idles on 40 degrees BTDC.
In a linear fashion, from 2200 to 3000, it's ramped down to 36 BTDC, and is at 36 until 6000 rpm, then from 6000 to 8000 I add 2 degrees linearly.
Does this look right to y'all, or am I way off? Is there more ET to be had anywhere with this curve?
Timing curves 6530 and 7530
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