I see there are alot of fans of NGK, Autolite and Champion. Is there a decided winner for a Slant that is hands-down the best spark plug?

I am running a Champion RV12YC. Would I be happier with something else? What would the Manufacturer and number be?

bwhitejr

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'72 Duster (Performance 360)
'83 Ramcharger (Performance 318)
'80 TrailDuster (360)
'80 D-150 Truck (See Below)
CompCams 252S, Holley 390cfm, Offy manifold
Ported, Polished and Gasket Matched
P4286813 Springs,0.040 Overbore,
0.090 Shaved Head

The bottom line is that it really doesn't make that much difference. I have had "bad" plugs that wouldn't run right of various brands, but never an NGK and I think not Autolite. I use NGK V-power GR-4s (stock or mid comp) or GR-45s or GR-5s (high comp).

Lou

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Home of Slant6-powered fun machines since 1988

I'd use either the NGK or Autolite extended tip plugs.

The Autolites are cheaper, but I think the NGK's last longer and are a slightly better plug.

The Autolite is 985, don't know the NGK number.......

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

NGK ZFR5N, which does indeed seem to be a longer-lasting, better-designed plug than the Autolite 985.

These extended-nose plugs are available only for the up-to-1974 heads that take flat-seat plugs, not the '75-up heads that take taper-seat plugs.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Both Champion RV12YC and AC Delco R45TS (!!!)works well in later heads.
Once on -78 Aspen AC´s were over 45000km (30000 miles) and still like new... even that car was a real oilburner

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-66 Dart 170 2d sedan 225+3-speed+7,25
-68 Dart 270 4d 225+3-speed+7,25 my first Dodge, R.I.P
-66 Satellite 2dht 273+904+8,75 (gone)
-and others