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Old 04-16-2013, 01:37 PM
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Spark plug help

Well, I fell for it....I bought the E3 plugs and thought that they would do a better job. NOT!!!! It seems like I am actually loosing gas mileage and my driving habits have not changed. Anyone have an idea on a good performance plug? I have a 1983 351W .40 over, MSD ignition/distrib. and coil, stock heads, Edelbrock manifold, Holley Carb, headers, etc. I had autolights before and liked them, however again, feel for the E3 hype

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Old 04-16-2013, 02:34 PM
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The stock plugs should have been fine.

Try to use what you bought, get the moneys worth.

The E3 plug should not effect the mileage to a noticeable degree. Are they the same heat range, and application?
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Old 04-16-2013, 03:02 PM
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Yep. Same everthing. Just have seen a loss in mileage since using them. Stumped on why
I just thought/remember reading that when you run an MSD ignition/coil/distrib. that I should have performance plugs.
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Old 04-16-2013, 03:15 PM
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Something you do have to look for is the sparkplugs sealing shoulder. Sometimes it is flat/square. Some are Wedged. If the wedged shoulder is used without a crush washer you can crack the spark plug socket. Not suggesting this happened to you.

MPG , I never got a significant change brand to brand. The plugs make the spark.
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Old 04-17-2013, 12:15 PM
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I've been working at the counter at Oreilly auto parts for about 12 years, i can honestly say that all the multiple prong plugs are strictly gimmicks, the inherent nature of electricity suggests that there will always be one spark. lightning never hits the ground in 2 places at once from the same spark.

The best plugs that i can suggest are NGK, I have ran them in import sportbikes to harleys, toyota pickups, mustangs, beemers and my current pontiac firebird and have never had any issue.
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Old 04-17-2013, 12:33 PM
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I've heard about those but I was always told they work better in foreign cars and not American cars. Guess it is worth a shot.
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Old 04-17-2013, 01:48 PM
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Quote:
Originally Posted by Fairlane351 View Post
I've heard about those but I was always told they work better in foreign cars and not American cars. Guess it is worth a shot.
NKGs will work just fine in domestic engine's, they've become my plug of choice driven by header clearance needs on SBC's, but I also found them to work well with a broad choice of heat ranges so they can be dialed in real tight for the engine's and usage's needs.

I've also found Autolights also work really well where fitment around headers isn't a problem, my plug of choice going back to the 1950s.

Bogie
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Old 04-17-2013, 01:51 PM
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Denso "TT" spark plugs with a platinum center electrode and titanium ground electrode are excellent fine wire design and are 1/2 the price of other platinum spark plugs. I discovered Denso spark plugs about 2 years ago after I examined a set of the new version of the "AC Delco" Rapid Fire spark plugs. GM sold the AC Delco Parts Division to the highest bidder in Brazil, Mexico, Singapore, Poland and Italy. Today, AC Delco is no better than the other POS made in those countries. AC Delco parts are made in 21 foreign countries and there are no longer any manufacturing plants in the U.S.

NGK Japan makes AC Delco Iridium spark plugs for GM to use in the supercharged ZR1 Corvettes . Denso is also made in Japan and is a independent manufacturer.
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