Review on ACDelco 41 805 Professional Platinum Spark by Joshua Days

My dad was a mechanic and I changed several batteries in one day but to my HUGE surprise the gaps on these connectors were inconsistent! Of the eight, four were outside the original recommended range of 0.60, two were just under 0.50, and the other two were between 0.37 and 0.39. After much research I found out that the recommended clearance should be .40, installed all the plugs and installed them in a 5.3 liter V8 Vortec engine. This is a 2003 Chevy Silverado 1500 Z71 Long Cab. The truck runs great but I'm really glad I did my homework and double checked the spark plug gaps.