Dear All,

My slant six is dual barrel, head shaved off 0.05", runs on dual fuel, LPG (propane) on highway and gas on offroad. I also plan to install a new Erson cam RV15M with a total head shave of 0.09". What sparkplug do you reccommend?

Thanks

Large or small plug?
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

yes ok, my bad... its small...

NGK UR4
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

Which head do you have? Does it use the aluminum spark plug tubes? If it's '63-'74, some of us use NGK ZFR5N with the metal gasket removed. For earlier engines, leave it on. My '64 has similar Autolite 985's until the next tune up.
For '75 and up (non-drool tube) heads, I don't know what the preferred plugs are these days.

_________________
"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBD, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO

We get the ZFR5F-11 over here 14 mm plug - works like a charm

_________________
Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars

its a metal head, I use propane (lpg) sometimes and have an erson RV15M ready for installation. One of the shop adviced champion RV15YC4 but I do not know which of the above plugs its similar to.

Stick with the NGK's you will be MUCH happier. (4) heat range should be great for the propane/gas and the RV cam. Again they dont make a extended reach plug for the late model(non plug tube) heads. So the Zfr5n plugs wont work for you use the UR4.
Frank

_________________
Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

OK makes sense... thank you for the great help