amswak

What spark plugs would you go with on an 87 l98? What is the recommended gap I should set them to? Thanks!

bogus

I would look at the NGK platnum or iridium.

Either way, I would set to factory gap, which, I think for the L98, is .050... correct me, guys!

H P Bushrod

I run the NGK V-Powers in my '85. The gap for my '85 is .035. I think the gap for your '87 is .045. Enjoy your car! :chevy

Paul G

I just posted a thread about bad spark plugs. My 88 had a set of AC Rapidfires in it with cut electrodes. I picked up a new set of standard AC's. Must have gotten some bad plugs in that new box. Car ran like poopie with them. Misfired teribly. So I cleaned and regapped the Rapidfires and put them back in. Car runs great.

I really like the rapidfires. I believe the stock gap for my aluminum head 88 is still .035". I have a hypertech ignition and set my gap to .040". Runs pretty sweet there.

Paul G.

CorvetteZ51Racer

Gap on the aluminum headed L98s is 0.035", and if you ask for a set of spark plugs for your car, they should be pre-gapped. The plug manufacturers are now pre-gapping their plugs because it's a bad idea to change the gap on any conventional single electrode spark plug.

BIG JIM 54

#5 Rapid-Fire's, gapped to .035"

Sam Lam

I use Rapid Fire #5 in my 89 L98....but I gap them to .045. This is the standard gap for this pulg. I tried the .035 and .045 gap. The latter works best in my garage queen! Have you tried setting the TPS at .65 volts? This gives me better throttle response.

86Moon

Gap on the 86 is .045 should be right on your sticker :yesnod:

scorp508

Cutback AC Delco Rapidfire #5s gapped to 0.045"