I installed NGK 2-Step plugs recently. Gapped them to 0.023" give or take. I am noticing a +20% drop off in ignition timing #4 after passing 5.5k rpms or so. What do you think is the cause?
Below are some 3rd Gear BM3 logs. Running e40 + Meth.
http://www.bootmod3.net/log?id=5d37bc6ec090c63a4d63fb0b
http://www.bootmod3.net/log?id=5d37bc01c090c63a4d63fb06
Should I buy new gapping equipment and double check? My last chisel tool is KO. Thanks