I just did a full service on my 2003 Tahoe 5.3. Used these wires with new ACDelco Iridium 41-110 connectors along with a bunch of other goodies. If you research LS engines and their ignition systems, you will find a fairly consistent consensus that using genuine stock, slightly or even heavily modified engines is more than adequate, reliable and consistent. These were the same cables I installed almost 100,000 ago when I was using the truck. If this set holds up as well, I'll buy them again.
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