What spark plugs make the difference?

[1987_chevy_]

I have a 383 stoker that was all rebuilt, everything new. I just recently purchased all of the ignition parts such as MSD distributor, MSD box, MSD coil. I need to figure out what spark plugs to put in the engine for the best performance. If you have a brand you really like, let me know.

Someone has mentioned to me using "Champion" spark plugs

 

[1987 GMC Jimmy]

In terms of longevity, iridium ones last longer. If I wasn't cheap, I'd get the Delco iridium plugs to see how they do, but I am cheap so I just do good ole copper plugs. The brand 'Delco' doesn't mean as much as it used to, but it's still better than a lot of it out there.

 

[rich weyand]

Autolite 24. It's what all the mud racers and circle racers around here use in SBCs.

 

[Rusty Nail]

I use Delco R45TS.

Around here, Autolite is a Ford plug and Champions are for Dodges.

 

[74 Shortbed]

Autolite or NGK..

 

[donnieray]

Delco R45TS in both of mine. They work well, don't cost much and hell, I change plugs every year anyway.

 

[Camar068]

yeh keep an eye out for AC Delco rebates/sales as well. I walked out with 2 sets of plugs for the 350 for $12 one day (Advance Auto if I remember correctly). Thought hell yeh, gimme another set.

 

[MikeB]

I don't think the brand matters at all, assuming it's a name brand like AC, Autolite, Bosch, NGK, etc. What does matter is heat range and construction. Precious metal electrodes such as platinum and iridium will hold their gaps a lot longer than standard electrodes.

Don't even think about the gimmick plugs with outlandish claims, such as E3.

Oh yeah, the smaller "ISO" pluegs will give you more header clearance. And make sure to get the proper threaded length for your heads! Both these plugs fit some old Brodix aluminum heads I had, but the larger plugs couldn't even be installed on four cylinders because of header interference.

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