Spark plug AC DELCO or BERU

I have a 2010 Silverado, and I had a 2011 Silverado. Go with the Delco's. It what your truck was built with, it what she will run best with.

If you do go with something else. Stick with a denso, or an NGK. Avoid Bosch plugs in that truck like the plague or you will start tripping codes.

Yup, these are great. Just be sure you gap them to APR's recommended gap of 0.024" ±0.002" or 0.6mm ±0.05mm. If you want 1 step colder plugs, not needed on your setup, but if you do for the future in Stage 2+. For 10$ more than the OEM NGK you can get the BERU.

41-156 is the new plug for the LE2 engine. Our 2016.5 got them, and they are fine. 41-123s came out of it.

Plugs need to be AC Delco 41993 (no substitution). I've had misfires with other "equivalent" plugs that went away with the correct plugs.

I have the beru side firing and they work just fine.

Only use the factory AC-Delco 41-987 plugs.

I paid $42 for the ACDelco iridium plugs, $45 for the ACDelco pro wire set.

i've had the beru ultra x's in for about 8K...no problems...no noticeable improvement either...starts the same (good), runs smooth...no complaints, but no better than stock...

I initially got the P0101 code and did the obvious - replaced the MAF sensor. No change, same codes. Goodbye $100.

I have a 1986 blazer and replaced the spark plugs with ac delco factory spark plugs purchased from napa, about 2 months later I was driving the vehicle and the vehicle had a miss then starting blowing out oil from the Pcv vlave from excessively high crank case pressure after electrode fell out.