spark plugs
 

whats the best brand of spark plugs for a 80' model 350?

Re: spark plugs
 

i like Autolite 25 or NGK plugs. Stay away from platinum plugs in older motors

Re: spark plugs
 

thanks man, anyone else got anything

Re: spark plugs
 

I use AC Delco myself. What GM uses!

Re: spark plugs
 

i've been using ac delcos but i had an accident taking my headers out tonight. i figured, hell its time to change them anyway.

Re: spark plugs
 

I'm an AC or autolite man myself.

RJ22...:)

Re: spark plugs
 

AC Delco - if it's good enough for the GM factory, then it's good enough for me.

Re: spark plugs
 

ac delco i nevert have trusted neverlite plugs (autolite)

Re: spark plugs
 

use AC Delco plugs in a GM. Autolite plugs in everything else. Use Champion plugs ONLY if you can't get anything else, and it has a mower deck under it.

Re: spark plugs
 

This is just IMO but I use AC Delco plugs most of the time. Autolites have treated me very well in all my race applications also. Even better than AC Delco

I would not tell my worst enemy to run a champion in his lawnmower :lol:

JUST MY OPINION THOUGH

RJ22...:)

Re: spark plugs
 

Just curious cooters, why not the Platinum plugs? I've been saving pennies to spend $8-$12 a plug, I have headers & I don't want to change them very often, so I thought I'd get the spendy ones.

Re: spark plugs
 

I'll second this question, but for a slightly different reason.

I'm currently trying to get a newly-swapped-in 350 to start, and during the swap process, I put in some Bosch Platinums (and stupidly threw the old nasty ones away). Now it won't start. With a screwdriver in the plug wire laying near a ground, the HEI will throw a 3/8" spark. With a plug sitting on a ground, it SOMETIMES makes a spark, but even then it seems weak.

Either way, I've been through everything else, and I'm pretty sure it's the plugs giving me grief. Now I have to wait for the munchkin to wake up from her nap so I can run to the store...


Anybody know WHY platinum plugs don't work?

Re: spark plugs
 

bosch dont work because they have no exposed electrode so when any carbon or fuel gets on the plug they misfire. Platinum plugs have a tiny electrode and also tend to misfire when oil, fuel or carbon get onto the plug. Platinum plugs work well in motors that run really clean with higher cylinder temps. These are my findings anyway.

Re: spark plugs
 

Makes sense, thanks cooters

Re: spark plugs
 

I wasn't thinking correctly, I meant I was saving up for those spendy Irridium plugs, any reason to go with them? Not go with them? Is it gonna be the same problem as with the Platinum

Re: spark plugs
 

i havent tried those plugs but i believe it is not worth the money when an ac/delco or autolite works perfect. American testing has proven NO power gains with fancy plugs which is why you wont see adds promoting more power anymore.

Re: spark plugs
 

Use AC Delco, but if you need header space, then I have been running the plugs from Accel. I have been using them for years and they have not failed me yet.

Re: spark plugs
 

ac delcos r45ts,imo best plug out there!I have been usin them all my life.

Re: spark plugs
 

X2

Re: spark plugs
 

AC or NGK. I've heard Autolites are good but now you're talking about using a ford plug right? Champion is for a lawn mower.