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Favorite spark plugs

scottsdale86

scottsdale86

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Anybody have a preference as to what plug you run? I have been using AC delco forever and never had an issue with them but was wondering if there was something everybody on here likes better. The engine is a stock 290hp GM crate engine, with 1986 factory everything on it. Has a quadrajet/HEI and edelbrock street legal headers and new exhaust with brand new cat.
 
ACDelco in anything GM, NGK in anything Asian, Motorcraft in Ford, no clue on Dodges...
 
RootBreaker said:
i run bosch platinums in my truck...
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you like working on and changing spark plugs often i take it?? :p:

i've used them in the past, burned them out in about 3 months time, was in a TPI 350 at the time.

Either use the AC Delco factory replacements, or now i'm using the AC Delco Professional line platinums, so far they are working great and these are in a rebuilt TBI 350 in the Burb.

I have run those old splitfires in the past in the TPI motor i had, then when i got rid of that car, i took the plugs and continued running them in the Burb for another 2 years, when removed they could probably still be used another year or two, only slightly worn.

Some people are saying not to use platinums in these older motors, i don't like the Bosch because of their encased electrode design, the ones i have now are open element and like said, are working great so far.
 
I dunno, maybe i overworked the Bosch plugs, i used them in two different cars, one was a 305, they didn't seem to work real well in there either, but when i absolutely needed plugs changed in the camaro i owned with that TPI 350, i put those in because they were cheap, i also ran that car pretty hard, cause it was fun :D
 
ACDelco. I ran those bosch ones that have three ground pins or whatever and they were good until they fouled out.
 
When I worked at the bumper to bumper in high school, we refered to the rapid fire plugs as "rapid foul"

I stick with the regular AC plugs in my old sbc stuff. I had the regular bosch platinums in my escort and there was a HUGE difference between them and the near new autolites that were in the car when I bought it.
 
I've ran about every plug out there in the past and once I discovered NGK V-power plugs and how much better they worked i've been running them ever since (at least 20+ years now).
 
AJMBLAZER said:
ACDelco in anything GM, NGK in anything Asian, Motorcraft in Ford, no clue on Dodges...
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X2,

Dodges= Champions or NGK's

Or ND's in Asian's

Some GM's like JGK's also.

those Bosch Platinum plugs are J U N K...

They foul out and produce higher HC's and CO's Been tested and prooven. Seen it on too many DIY'ers with emissions problems crying the blues after a plug replacment

But if they work for ya...Go ahead
 
scottsdale86 said:
What did they do that made them better if you don't mind me asking?
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Quicker engine starts, smoother idle, idle RPM's increased (more fuel actually being burnt because of a better/hotter spark) and a MUCH LONGER period between plug changes (2-3 years on average and even then they still look like new but I change them anyways since i've already taken them out).
 
scottsdale86 said:
Anybody have a preference as to what plug you run? I have been using AC delco forever and never had an issue with them but was wondering if there was something everybody on here likes better. The engine is a stock 290hp GM crate engine, with 1986 factory everything on it. Has a quadrajet/HEI and edelbrock street legal headers and new exhaust with brand new cat.
Click to expand...

AC's... i do maintenence on hundreds of SB and BB chevy's, literally change thousands of plugs a year... boats can be very hard on plugs, especially when ya throw in fogging them every fall, high rpm, etc...

I'm not opposed to NGK, decent plug, but i still think AC's are a bit better...

Champion plugs blow... another company living off it's name.....
 
I wont use Bosch Platinium plugs,I've seen too many engines my friend tuned up with them that skipped or misfired with those plugs!..they ran better with the original plugs!....I see reason to run platinum plugs in any older engine that was not factory equipped with them,and many wont run right with them...a waste of money and effort to install!..

I have always used AC-Delco's ,or Autolite in GM engines..I noticed the newer AC plugs are mexican junk though,I prefer the old AC "fire-ring" plugs or Autolites..
I have used NGK's in dirt bikes but not much else,I'm not a big fan of them...
Champions SUCK,I hate Champions..well,not that much,I get plenty of free lawn mowers that were scrapped,that only needed the Champion plug tossed away,and a GOOD brand of plug installed and some fresh fuel,and they ran sweet..the new Champions with no "ribs" on the insulator they put in newer mowers suck the worst!..they show excellent spark when you check for it,but in the engine,the spark jumps to the shell inside under compression and it refuses to fire!..

I've had decent luck with some "Mighty" brand spark plugs I got a barrel fuul of free when a gas station closed up--but I think AC made them for Mighty,some even had the AC insignia stamped on the shell near the threads,but the porcelain said "Mighty"..!...I dont believe in paying 5-10 bucks for "miracle" plugs with multiple ground electrodes either,I see no advantage to using them...the only plug I used that did make a big difference in a one lunger that fouled plugs religiously was an "Aldor" brand one touted to "fire in oil" and never foul--well,the one I used lived up to that claim,the engine fouled every other plug in a matter of minutes it smoked so bad,but the Aldor plug lasted a whole season without fouling..it wasn't till I couldn't see the electrodes that the engine was starting hard,when I cleaned it,it ran just as sweet as before..all the other plugs were DEAD once they fouled..
 
I use ac/delco in all my GM's. I used the bosch platinums also. I noticed a running difference after switching to ac/delco.

I've heard the platinum professional shouldn't be used in a carbed engine, because a FI engine monitors the A/F mixture closer. Is this true?
 
i just looked at autozone and they have ac delco rapidfire? $5 each... dont see any others...

they have accel for $30 each!!!!!WOW
 
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