well got a stock 84 ramcharger 360 4 barrel auto. plugs in it now are champion . I think 3408 never heard of that but is what it is. anyone have good luck with a certain plug than others ?? getting ready for a tune up. do you think its worth the while to put headers on the truck for a little more HP / mileage. Ramcharger gets 10.9 lol someone put a 600 cfm elderbrock carb on it. got it dialed in at 21" vac.

Gas mileage and 4x4 do not go together. I would have been thrilled to pull 10.9 from any of a number of 360-4, most of mine were in the 8-9 mpg range.

I never noticed much difference in which plug brand I ran, other the a few issues with AC plugs. Headers can help, if you keep your foot out of it, but I'm not sure the added noise, additional cost, and difficulty of installing and working around them is worth the extra little bit of fuel mileage involved. Headers do tend to add a little kick in the seat over manifolds, but one tends to get addicted to the kick and forget about the mileage.
Unless your doing a lot of driving and putting on a lot of miles, many gas savings parts barely pay for themselves in real life. Gene

Gas at $3.50 a gallon makes some of those mileage-increasers much more viable.

R.

Never had a problem with Champion RN14YC

Robert