OK for the gazillionth time what spark plugs AND why?

[pontiacgp]

NGK TR5, TR6, BR6EF or BR7EF depending on if the engine is stock, high performance NA, on a little nitrous, or heavily boosted.

The BR-series are non-projected tip. The TR5s are stock heat range and the 7s are two steps colder.

Also these are all copper plugs and work great - because they are copper it forces you to change them about once a year and therefore forces you to keep closer tabs on how your engine is running.

Cooper plugs are the best to use, they give the best performance cause they are the most conductive plug. The platinum and iridium plugs are not as conductive, they heat up more than the copper plugs with their high resistance but those materials last longer than copper.

 

[pontiacgp]

And if you want more power from your copper plugs cut the ground electrode back to the edge of the center electrode. It's done in racing, nascar teams unshroud the plugs for the race and leave them alone for testing. With an unshrouded plug you decrease the gap by 10. As you can see the spark from the plug will not be deflected by the negative electrode

 

[SoFloG]

Ac delco standard 43s. One of my mentors back in the day said to always run ac delco in sbc's, although i have noticed a decrease in quality over the years.

 

[TURNA]

The Autolites I use are a copper plug as well.

I have been wanting to try the NGK's for a while, but something keeps holding me back from buying them.

I did put a NGK in my weed wacker last weekend though!!

 

[MrSony]

Factory calls for AC Delco R45TSX in my 350, that's all I use, gapped to .055. Never let me down, plugs looked brand new after 5500 miles.

 

[pagrunt]

I almost always run standard AC/Delco's, used Bosch platnums with headers since they're shorted.

 

[84GP455]

Factory calls for AC Delco R45TSX in my 350, that's all I use, gapped to .055. Never let me down, plugs looked brand new after 5500 miles.

I agree, I also use AC Delco R45TSX and gap them at .060" even though the manual calls for a .045" gap but you can go wider with a higher voltage from the coil. Autolite is for ford (no good)!

 

[olds307 and 403]

Ac delco standard 43s. One of my mentors back in the day said to always run ac delco in sbc's, although i have noticed a decrease in quality over the years.

This above, since they started manufacturing them in China, along with Autolite, both are not quite as good. I just find my Olds motors run smoother with standard NGK copper plugs. I ran the platinum NGK in the Dakota and the Tercel. The Challenger will get Autolite Iridium's when it gets new plugs, no one else makes the Iridium plugs for the 3.5.

 

[SoFloG]

I consider myself a decent mechanic, yet the last few times I installed delcos I've ended cracking the ceramic on at least one out of 8 plugs installing. One of my good friends who has bought some of my old trucks traded the carolina skiff i sold him for a 90 stepside rcsb and bought delco platinums for it. While helping him with the tune up we noticed one of the plugs was not threaded. It was manufactured with no thread, wtf?! I have the pic on my old phone. How does a manufacturer error even get to the auto parts shelf in a 4 pack like that? The newer delcos seem to foul easier than back in the day. However for the cheap price, I'll keep swapping and gapping at .050 as needed. Sorry for the rant after a 10 hour shift in the kitchen the tequila is taking over.

 

[SoFloG]

From my 2.2 to my 4.8 to 5.3 (which i gotta change asap), I'll stick to what I know. For any imports or non gm sh*t I'll roll with ngk every time.