Thanks, I'd always seen most engines I've messed with run best WOT at around 12-12.5, but every engine is different, so always good to see what they like. I did change the secondaries, and have the AFR in the 13:1 range now. Did a few pulls today, seems like the times are a around 0.05-0.1 sec better than what I'd been getting (2nd gear pull, 2800-4800 rpm). 3.7s vs 3.8s before.
