bowersock

Which spark plusg should I use on my 1986 with Aluminum heads?
Thanks
Roger

skateparkdave

ACdelco rapid fire #5's

rws.1

Personal preference plays a major role.
I use Bosch Platinum +4's.... but others in the forum don't like them

65Z01

If you are handy with a Dremel, try the cut-back electrode mod (details on my site) on some stock AC Delco plugs and set the stock gap.

rick lambert

Go with the ACs, I'd forget about the platinum plugs, guys have complained about pucks comming off and ending up in the combustion chamber. My understanding about cut backs are that some plug manufacturers are selling them now. And one article I read said they only provide help in the upper RPM range-think it was 4500-5500, range could be wrong-but it's close.

chucks88

Pro............I heard copper plugs disipate heat the quickest.
Con...........They don't last as long

I use NGK's

rws.1

Not all Platinum plugs have pucks.... The Bosch +4's don't and if you look at the electrodes it's like having 4 cut back electrodes on one plug.
Copper plugs seem to foul quicker and need replacement sooner than platinum but also deem to give smoother idle for some...
Its about how much do you want to pay and how often do you want to change them....

Brimis

AC Delco!

cv67

88421VETTE

I swapped out my bosch +4's for the rapid fires and the car ran much better. any bosch plats suck

DINO