I am fixing to change my spark plugs but do not know which to get. Thought about delco rapid fires or accel u groove plugs. Which would you all prefer. Its a l69, with holley 4bbl and a mallory coil with accel cap rotor and wires. And can some one explain to me what the difference is between cold spark plugs and hot spark plugs?

I didnt like the u-groove plugs at all. I felt tlike I was actually losing power with them! Now I am using the Bosch Platinum +4's. They are pretty good and guarenteed for life! Hence I get new ones every year for free!

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1989 Formula 5.0 TBI w/ T Tops, bosch +4 plugs, accell 8mm, accell cap&rotor, K&N air filter, relocated IAT, 3.42 open rear, Energy Suspension's poly bushing kit, 14x3 Edelbrock Open Air Filter, and much more to come!!!

DO NOT USE ACCEL U-GROOVE PLUGS! I had these on my '86 & the end that fits into the wire boot started to seperate from the rest of the plug - they are friggen SCREWED ON! I now use regular AC Delcos & they are fine.

Unless I ave this backwards, I believe "cold" plugs do not retain much heat for a hotter spark, & "hot" plugs soak up more heat for a milder spark, I'm not completely sure on this though.

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'86 Camaro SC Silver/black
Goodwrench 350 with hotter cam, intake, some other things.

'88 Camaro SC, hoodless, radioless, styleless piece of **** parts car

"Alcohol does not make ugly people attractive. It makes it so you could care less that they're ugly." - Doug Stanhope

i've used accel plugs with good results ,but any more i think i'd stick with ac plugs.

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ICON Motorsports

I've had accel u-grooves in my car for about a year now and I'm happy with them. I checked them after about 15000mi. and they look great, much better than the bosch's I replaced them with. I would recommend them.
"Hot" and "Cold" refers to the ability of the plugs to transfer heat fromt he combustion chamber into the block, the hotter plug will transfer heat more slowly than a cold plug.
And by the way, for the idiot who posted above, many plugs have tips that screw on and off, it doesn't make them junk.......



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Shaun
92 B4C 350TPI
AFPR, Underdrive Pulleys, Hypertech Thermomaster, Dynomax Cat-back, K&N's, Airfoil, Ported Plenumhttp://www.angelfire.com/wi/lhelm99

If I were you I'd stick with the bosch or the ac delco's. My friend has a 92 camaro rs, and he put Accel U Groove's in his car. They felt the same as my ac delco's that I had in my firebird.

I have U-groovs, and they are doing fine 14,000miles later...
Gettin Platinum +4's next time thoguh.

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89 IROC-Z
305 TPI
B&M Ripper on T-5
Black and Gold
couple of mods... more on the way

Bad cop... No donut

Bosch Platinum. Only way to go

Bosch Platinum is the only way to go? I know a guy who owns an auto shop, and he said that he pulled some bosch Platinum 4's out of a '97 monte carlo, and just threw them a way, and put some AC Delco's back in! performance is about the same, but for the price, AC delco is the best! Even thought those Bosch 4's have a life-time, you can't afford to be replacing plugs like that in a '97 monte carlo! You have to drop the engine to change them!

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89 Firebird LO3
Open element, MSD blastercoil, ACCELL cap and rotor, Moroso 8mm Blue Max wires, #2 Rapidfires, straight pipes, and keyless entry.

I love the accells that are in my firebird,I think they work great!

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82 firebird with 305H.O.,Block bored .30 over,Keith black hyperutectic flat top pistons for 10 to 1 compression,Turned crank,Magnafluxed connecting rods,Melling H.V. oil pump,and double roller timeing chain,Ported and shaved heads w/3angle valve job,Z-28springs,Summit push rods and comp cams magnum roller rockers,Ported Edelbrock performer r.p.m.intake,Carter 625 afbcarb,Accell spark plugs,wires,and H.E.I.super coil,Heavy duty cap and rotor,Clevite performance cam with 450-460 inches of lift,Comp cams lifters,700r-4 tranny rebuilt with trans-go rebuild kit,corvette servo,New torQue converter,Flowtech headers,Flowmaster muffler,3.73limited slip rear end,Energy suspension bushings from front to rear,Energy suspension tranny mount,New center link,ball joints,trans-am steering box,Hopeing to run good times when i FINEALLY do get to the track!!

I've got Accel's in my brothers GTA. I needed the extra room of the shorter plug, but now I think Champion and others make shorter plugs. I havn't noticeed anything special good or bad as far as performance changes with them.

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92 Convertible Trans Am: Mostly stock, L98 long block, ported heads, SLP Headers, Hypertech, K&N.

84 Camaro: 454/TH400 in progress.

ACCEL U-GROOVE PLUGS SUCK BIGTIME!!! I was due for a tune up on my 87 GTA and took out my old plugs (SPLIT FIRES) and replaced them with the Accels...less than a week later, 2 of the plugs fouled...BAD!!! they were gapped correctly and installed correctly, its just that they are pieces of crap. So I quickly went out and bought myself Bosch Platinum +4's and was not only satisfied by the integrity of the plugs but I also felt a slight increase in performance...I still have the 2 plugs that fouled out on me bout a year ago and threw away the good ones so I can show all y friends what kind of crap they are and use them as an example to never ever buy them!!! Accel makes some damn good parts and electrical, but plugs are def not their forte. Dont make the same mistake!



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Nowhere near stock 87 GTA
---too much shiznit too list...

I use accel shorty U's and I have never had a problem. they clear better than the stock ones. I used to use the ac and never had a problem either they both work great I also have used others but, don't bother just a lot of $$$ for nothing save it for a real mod.