SparkPlugs in a 4x4

[Burt4x4]

Ok offroaders what plugs do you like and why?

I realize alot of plugs are very similar and most all will work fine.
I will be replacing all my plugs soon and thought I would get all the opinions out there

My engine: 1974 454 w/aftermarket EFI about 9:2 compression and Mallory ignition.

[snj8198]

what heads are you running?

[Burt4x4]

Originally Posted by snj8198

what heads are you running?

336781 w/oversized valves
The vlaves are 2.19 & 1.88
The heads were shaved and the block decked. Even had the intake shaved to line up the ports perfectly.
What you think?

[Burt4x4]

Shezz, I knew this was a boring post...

Ok so

NGK
Autolite
Bosh
Champion
AC Delco
Other?

Pick one!

[snj8198]

well?? im running autolite 24's in mine. also running Eddie's rpm oval ports and their 3551 system. plugs seem to be the right heat range with 9.4 compression and short duration cam. 218/226, 510/510, 112 lsa. -steve

[Burt4x4]

Cool, sounds like your engine is very close to mine..
Not too sure what all the numbers meen but here they are:
Gross Valve Lift: I .505 & E .505
Duration @ .006 Tappet Lift I 254 E 262
Duration @ 0.05 I 210 E 218
Lobe Lift I .297 E .297
lobe Separation 111
CompCam 11-231-3

Ok so one vote for Autolite!
Next?

[Dooley]

ACCEL 8178 and sometimes AC R44T.

[Burt4x4]

Thanks
Spark plugs are boring to talk about I guess hahahaaa

[68,69 K20]

I run Accel, not sure of the part# offhand, 72 350.

[Blue_71]

this may offend some, so first off if it does im sorry, but from what ive seen and experienced for myself, i wouldn't put autolites in a lawn mower. they arent worth the metal they are made out of. i ONLY run AC Delcos. for your engine, i would say a R44TS, or because of the EFI i would recomend a CR43TS

NGK- good but overpriced
Bosch- okish, not highly recomended
champion- small lawn mower type engine only

[snj8198]

crap...i new the autolite hits were on the way!

[RED72blazer]

NGK in all of my personal cars. And NGK in all of my customers cars unless they ask for something different or they aren't available.

[Burt4x4]

NGK is winning

[powerdriver 1958]

Went to the U.S.Nationals 2 years in a row and the most used plug in the sportsman classes was.......Autolite

[Hoods69BadBowTie]

I run only ngks or ac delcos. I am with him I have never heard anything good about autolites in my life just my .02 cents lol.

[Burt4x4]

Cool!
Thanks for the opinions fellas
Anyone else?

[BurnoutNova]

I only use AC plugs in my old stuff. In fact, I use whatever is OEM. Be it a car im working on at work, my own stuff, a friends car I'm helping wrench on, ect... OEM. My Toyota truck I have NGK.

AC plugs are great, even for engines that have been modified. I use AC R45TS plugs in my Nova, and it has a completely aftermarket ignition setup (MSD box, Accel dist, ect) lots of people say theyre only good for bone stock applications.

One thing to say away from is those splitfire, or Bosch +2 or +4 plugs... waste of money eclectricity ALWAYS follows the path of least resistance.. meaning only one electrode will fire anyway, so 2 or 4 is pointless. Hope I didnt seem like I was rambling.

[62 short step]

I use ac delco.

[71 super]

I really like autolites in motors with compression above stock,I also use them in my 92 softtail as well. With that said I have ac's in both stock motors in my 2wd and 4x4- ac seems to foul out quickly in higher compression engines.

[vtblazer]

Not a big block but I run ACDelco's in my TBI'd 383 and like em pretty well.

NGK's in all my toys though, snow machines, dirt bikes, 4wheelers etc.

[Burt4x4]

Cool!
Thanks for the comments fellas!

I'll prolly try the NGKs
I am running Bosh Platnum in there now, same plug I ran in my 350. Never had an issue with them just looking for a change I guess.
I'll be pulling the plugs to adjust my rockers so I figured I'll toss in some new plugs while I gotum out
Burt

[Burt4x4]

Here it is! The best spark plug ever:



And they only want $25 bucks EACH

I was reading some reviews on a corevette site and most all think this is a scam, marketing ploy...

Too rich for me to "try"...

[383k5]

I run Ac delco R45ts to be exact, thats in my 383, and 350

[BurnoutNova]

Originally Posted by 71 super

I really like autolites in motors with compression above stock,I also use them in my 92 softtail as well. With that said I have ac's in both stock motors in my 2wd and 4x4- ac seems to foul out quickly in higher compression engines.

I have AC's in my nova, with 11.5:1 comression, and even to 8,000rpm they work great. Never had a probleom with them fouling unless I flooded the crap out of the motor.

I can see that happening tho if you dont have a good ignition system with enough voltage.

[dammitmitchell]

i run accel shorties cause i refuse to hit my headers with a hammer..
with my luck a tire would somehow fall off..
but i like them.. it runs good and they havent burnt up even when i drive like a tard.. or when i drive like a little girl 9with kiddos in the truck)