This may not have anything to do with but, I don't know if they change to "oxygenated" fuel during the summer months?
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
Looking through the logs, it appears that it is kicking KR a little early, but not enough to call it false. Was this on 87 or the 93 octane? If it was 87, 16-19* might be all you can get at 2000 rpm for high map, where you're throwing KR. If that was 93 octane I'd expect to get more. Dump a bunch of octane booster in it and see if the KR is still there. The stock cam in these trucks does not seem to allow a ton of timing.
I agree with mangone though, in cruising areas (40-60 kpa) you should be into the 30s on timing.
Of the cruising speed should be in the 30’s and it’s not how do I get it there?! Lol
Have your tuner adjust it, or buy tuning software and do it yourself. It should handle 32-36* at light cruise, but it would be best to verify while tuning.
He told me the vortec won’t handle that locked. My mechanic “engine builder” said bull **** it will just fine. Say we lock it at 33* what would that do at idle or low speed?