I have just finished my lt4 hotcam and mac header installs and will be doing a tune up msd 8.5mm wires, ac delco o2 sensors, and was just wondering about plugs...I originally had bosch platinum 3 plugs or somethin like that but had an extremely rich condition and found a dead plug soooo I have read about stock delcos but seems the electrodes tend to come off, then only read gopod things about the ngk tr 55s except for the fact that they are only good for 10-15k miles..... Just wondering what is recommended?

 

Personally I would just throw some NGK TR5's in it.

 

Whats the difference between the tr5 and tr55?

 

Some people have complained about the platinums pucks coming off on the AC Delco plugs, but I haven't had any problems with mine. More people seem to have good luck with AC Delco than bad.

 

bosch platinums...no plus2 or4