Spark Plug Confusion

[jburnsinnj]

I installed a set of AC Delco R44TS plugs for my 87 GN. The 87' GN owners manual stated that is the correct plug and shows a gap setting of .045

A day later I read on the forum the "Spring Cleaning recipe" and see that it recommends a different plug, R43TS or a R42TS depending on the engine build and says to gap at .035

What am I to believe ? My car is basicly stock but for an adjustable FP regulator, Walbro, and hotwire. Running OEM chip etc. 34K miles.

Thanks for any suggestions.

 

[bison]

If your stock you are gtg.

 

[Boost231]

the 44ts is alittle hot In my opinion.however if its stock you will be ok. For you car i would run the 43's if you want to stay with ac delco. I use to Run AC CR42TS prior to trying out a set of NGK UR5's. ever since then i have been runing the NGK.

as far as gap, i gap everything stock to modded to a tight .032

 

[bmackinnon]

IA day later I read on the forum the "Spring Cleaning recipe" and see that it recommends a different plug, R43TS or a R42TS depending on the engine build and says to gap at .035

What am I to believe ? My car is basicly stock but for an adjustable FP regulator, Walbro, and hotwire. Running OEM chip etc. 34K miles.

Thanks for any suggestions.

For your stock-ish setup, like mine, the R43TS at a tight .035 is the ticket.... better yet, run the CR43TS (same price, like $1)... 'C' is for 'commercial' and it has a much more beefy electrode/ceramic..... age old advice on gnttype.org... I've been running that plug forever, and just recently changed 'em after ~20k miles.... and they really didn't need changed.... looked fine... in fact, I wouldn't have even changed them, but I broke #6 off getting it out.... :wink:

 

[GN owner]

Do yourself a favor and get a TurboTweak chip. There will be a very noticeable difference in performance and overall driveability.