Spark plug gap with more power and timing...?
Thread Starter
TECH Enthusiast
Joined: Jul 2004
Posts: 521
Likes: 0
Spark plug gap with more power and timing...? I am running OEM replacement plugs with about 3K miles on them. I gapped them @ .055", per the recommendation, and they have already spread to about .060". Is this an indication of anything, or is it completely normal?
My mods are below. Obviously, they are producing more power. I also have a 93 octane tune with advanced timing.
Should I still be running a .055 gap, or should I gap them closer or farther?
My mods are below. Obviously, they are producing more power. I also have a 93 octane tune with advanced timing.
Should I still be running a .055 gap, or should I gap them closer or farther?
Probably just normal erosion. I believe GM has changed
their "replacement" plug type recently (platinum to
iridium) and also lowered the recommended gap to
0.045" (just like the old days w/ HEI). Their TSB also
said something about you shouldn't gap them, any
that are out-of-gap, out of the box should be returned
as defective. Heh. No User Servicable Parts Inside.
their "replacement" plug type recently (platinum to
iridium) and also lowered the recommended gap to
0.045" (just like the old days w/ HEI). Their TSB also
said something about you shouldn't gap them, any
that are out-of-gap, out of the box should be returned
as defective. Heh. No User Servicable Parts Inside.
