which one is better for my 84 2.8 v6

 

I cant speak for your V6, but I can tell you that Ive tried both and like the +4's much better. Ive had them in my car for the last 2 years!

------------------
Convertible, L98, Mini-ram, ZZ9 cam, Comp Cams 1.52/1.6 steel roller rockers, Trick Flow 23* heads, K&N's with chopped airboxes, March underdive pulleys, Edelbrock ceramic coated TES, Flowmaster cat-back exhaust, Dynomax high flow converter, MAC subframe connectors, Accel box & coil, 3.23 rear gears, white face gagues, and NOS!
When I get back from Kosovo I will be installing these on-order items!

 

How about just plain old ACs?

Seriously, look through these boards. Anybody who's been around for a while, knows a decent amount about cars, and/or has a fast car will tell you not to bother with gimmick plugs. And if fast cars and the people who know them don't use 'em, why should you?

------------------
Ed Maher - Moderator @ The Carb Board
92 Z28 Convertible - Quasar blue / Tan top
LB9 4L60 GU2 G80 - stock, soon to be sleeper

- Definitely prototypes, high powered mutants of some kind. Too weird to live, too cool to die

 

Well said Ed. I have to laugh at the concept of multi-tip plugs...electricity ONLY goes to one tip..the other 3 are a placebo.

Further, now you have 4 tips to be concerned about the proper gap etc.

The best performance from any plug (and I've tried virtually all at one time or another) was when I ground the tip of the electrode back to expose as much of the "spark flame" as possible. That will yield the best performance regardless of spark plug.

 

It's just marketing hype. I run ACDelco R43TS in my race car and they work fine. For the extra cost of the fancy plugs it's not worth it. The only advantage to using other plugs are if you buy platinum plugs. They'll last longer than regular ones and only if the engine isn't worn out and fouls them.

------------------
Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block almost ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley