I just finished swapping a 6.0 into my 1982 K20. It was previously a LM7 with a SM465. It ran and drove great, I built a LQ4 with 862 heads and a stage 1 BTR Truck cam. I have only driven maybe 15 miles with the new engine, on cold start it seems to run pretty good, but as soon as it warms up it has no power until after 3k RPM. I made an earlier post, which helped a little but after a lot of research I feel that I understand tuning and HPtuners a little better. So I apologize for the multiple post.
Before I get roasted, I have a AEM Wideband on the way!
NewBaseTune.hptdrivingdata.hpl
I have noticed my Engine coolant temp is a little higher than I'd like. I installed a new 185 Thermostat when building the engine but don't think its working correctly. At idle it will creep and doesn't cool until I add some RPM. I will get a new thermostat installed. From what I have noticed it seems to pull a lot of timing. I started with a stock 5.3 LM7 tune file, added 15% to Main VE and pulled 5 degrees of timing just to try to keep it on the safe side with the added compression. I also switched it 6.0 and changed the cylinder volume. Using a compression calculator, it comes out to 10.7-1. Engine runs good, no mis-fire and idles smooth above 650rpm. I'm thinking the narrow band can't really read how lean its getting, and is pulling timing. Never tuned before but excited about this challenge, hopefully I won't have to rebuild this 6.0 again as that was a challenge in itself.