Hello,

I am planning on changing out the spark plugs on my 76. Pretty much stock motor except for the edlebrock intake & carb. Have any of you tried the AC Delco rapid fire #2 plugs vs. std R45TS. They are marketing better fuel economy, smoother idle, etc. etc.

For more than double the cost are they worth it?

Thanks!

probably not..by what I ve seen for stock engines, the E3 plugs tested best and even that was minimal gain 2-4 Hp and mileage gain so small it could barely be measured.. Just Use a quality plug ,which ever brand you like..I personally prefer Autolite Platinum, you ll be fine. All these claims of huge gains from these products are just Hype.

I agree with fishslayer, I have a 76 which is the low compression motor, any good quality plug will work, I don't think you will see any difference by switching to a fancy high priced plug, it is only when you are running a high compression or supercharged/turbo motor you might see a slight improvement from reports I have read.

Thanks for the input!

Hello,

I am planning on changing out the spark plugs on my 76. Pretty much stock motor except for the edlebrock intake & carb. Have any of you tried the AC Delco rapid fire #2 plugs vs. std R45TS. They are marketing better fuel economy, smoother idle, etc. etc.

For more than double the cost are they worth it?

Thanks!


It's just marketing hype. The expensive ones won't perform any better than the standard ones.