What Spark Plugs to Use?

[MandarinSixSeven]

I'm just about to go out and buy some new Plugs, i was told that since Ac Delco are what would have come on these trucks, then they are the ones that would most likely be the best, since GM vehicles are made to use AC Delco...what are your thoughts on this? ...i mean it makes sense to me, but, are there any reasons to not believe this?

[Mountain Man]

You can use what ever brand you like. There are lots of good plugs out there, Bosch, Champion, etc. I have tried them all, and the ones that actually did feel a bit more responsive, and the ones I run, are the AC Rapid Fires. I use .045 gap for my 355

[Jmac05]

Make SURE The ones you get are the right ones. I was getting all new plugs and wires, and the friggin' idiot at the Autozone gave me plugs way too long, and I almost cracked a piston! Double check the new ones against the old ones.

[justin]

I was told slit fire plugs add horse power. Anybody know if this is true?

[COBALT]

I use either Autolite #26 or Champion #25 in my 350.

[68 with 350 TPI]

stick with AC Delco, champion,autolite.

Never cared for fancy plugs like split fire.
If you want more go from your plugs get a MSD 6AL box

[Bamm]

Q: Do those fancy split tip sparkplugs really work?
A: No. Electricity follows the path of least resistance. It has nothing to do with a split tip or a fancy U groove! The sparkplug does one thing only. It acts as the grounding source for the ignition and that's it, period, end of story. The only difference with a sparkplug is that there is a gap in the current path. The size of the spark is dictated by the voltage and amperage output of your coil and the output of your coil is dictated by the saturation (dwell) time of your ignition system. You'll hear claims like, "it made more horsepower" or "I got better gas mileage". Well of course they did! Their engine needed a tune-up or they wouldn't have tried the new plugs in the first place! Any engine would get better gas mileage and more horsepower after a tune-up!

What split tipped plugs can do is promote pre-ignition and/or detonation. How? Try this, take a hanger and try to heat it up with a cigarette lighter. Oh yeah, it gets hot, but not hot enough to glow cherry red. Now take a paper clip and heat it up with the same lighter. It gets hotter faster and glows cherry red! It's simple, it takes less heat to heat-up smaller objects. What do you think those tiny little pieces of split tip electrodes are doing in your engine? Now add more compression and heat (a race engine) and they act like a dog gone glow plug... detonation... ka-boom! Just about in that order.


Not my quote. I got this info from http://www.badasscars.com/techtips.html
great site with lots of info...........JB

[justin]

So basically your telling me I wasted 5 bucs a pop on these slit fires.
Bummer

[Bamm]

Dude, I have them in my saturn, and they are not bad plugs, that's not what the guy is saying. Just don't expect too much out of a plug. Try them you might like them, but you would have probably been just as well off if you had used the rapid fires..........JB

[COBALT]

Dude! Yeah, no, seriously, dude.....

lol just picking on ya Bamm 24

[Bamm]

Dude, like I have them in my, hey wait a minute "Hey Dude, Where's my car?"
o.k. bad joke, even worse movie.......LOL...........JB
But check out the website, it is top notch.................JB