Plugs for 5.7L

[Tahoe933]

I'm curious what everyone uses when they install new plugs. Do you stay with stock? What gaps are used? I have the TBI engine in my 95. Mike

[Frank S]

I had a '93 TBI and went with Bosch Platinum's and they were ok but they fouled out fairly quick.

IMO,if you are running a stock ignition system,just stick with stock AC Delco plugs.

[Kansas Kid]

I used AC Delco Rapid fires plugs on my 89 TBI.  I believe the correct gap is 0.035 in.

[Guest Friz]

Ditto

[Shaners]

AC Delco...

[76BBSub]

If you want you can check to see if AC Delco makes a RapidFire plug for your application.  They are pre-gapped, so you don't have to mess with it.  They have four electrodes and theoretically create a hotter spark since the spark can go to the most "attractive" electrode given the engine conditions at the time, ie. position of plug in the combustion chamber, spark voltage, etc.

Otherwise, just stick with AC Delco, although with the High Energy ignition I run a .045" gap.....035" with points.

Jeff

[Tahoe933]

Thanks guys. I appreciate the info. Mike