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Recommended Spark Plugs

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1986Blazer, Jun 21, 2001.

  1. 1986Blazer

    1986Blazer 1/2 ton status

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    What spark plugs do most members of this forum use?

    I have used both NGK and Bosch Platniums...both seem to work fine but is there really a difference?

    Also......Napa and other auto parts stores ask what "Engine Code do I have." They have L, M and I think H on their computers. Since I have a 85 or earlier crate engine I have no idea what code I have. Any help?

    Thanks

    <A target="_blank" HREF=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</A>
     
  2. fr8train

    fr8train 1/2 ton status

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    I use bosch platiniums . Got better mpg than with champions and NGK.
     
  3. 1986Blazer

    1986Blazer 1/2 ton status

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    Any idea what the best Bosch spark plug for use on a 350 is?

    They have atleast two versions - on is smaller than the other but both are listed for the 85 350ci GM?

    <A target="_blank" HREF=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</A>
     
  4. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Location:
    Western Massachusetts
    I use AC Delcos.
    I have used Autolites, NGK, Bosch Platinums, and RapidFire.
    AC Delcos have worked the best.
    Platinums seem to work the best in F.I. engines, but in mine (I run mine rich with carburetor) they seem to load up. It could be just me, but I believe they were designed specifically for the newer, higher combustion temp, low emission motors to get all the performance out of them, but because of that don't perform as well in fuel enriched vehicles. They worked well at first (quick startup and acceleration), but quickly lost performance and even though they are marketed as clean running plugs, I had them in there the shortest amount of time, and they seemed to have the most carbon buildup of any of the plugs. I put AC Delcos in several family vehicles and have never had a problem (except for breaking one while trying to loosen a stubborn temp sending unit).

    If you didn't built it yourself, how can you call it yours.......?
     
  5. bigblue

    bigblue 1/2 ton status

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    Has anyone used the Splitfires...I just got a set and now am wondering if I was wasting my money. I got the wires and plugs...?
     
  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    I like AC Delco's and NGK's. AC Delco has far more heat ranges for tuning... they have about 2 or 3 plugs for every one of the NGK's listed. Have NGK's in my truck now though. Those Bosch plugs are crap... just a step above the SH#tfires... what a joke. I'd only put Bosch in a VW cause that is what they use OE. Just my $.02 though... most any new plug will esaily out perform an older or used plug so benifits are tough to find

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <A target="_blank" HREF=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</A>
     
  7. mlb79

    mlb79 Registered Member

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    I haven't tried them but I have heard alot of good comments about the AC rapidfires. I have used the bosch platinums in all my cars. They seem to last alot longer than the basic AC delco plugs although that would be my next choice.

    Mark

    79 K5, 3" lift, 400 cubes of nasty
     
  8. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    I have the Rapidfires in right now, haven't looked at them, but haven't had any problems. Had Splitfires in a '94 GMC 1/2 ton, helped, but didn't help in the K5. When I pulled them, I learned what kind of crap they are when I looked at them.

    "I am Republican. Not a baby-killing, tree hugging, land grabbing, touchy feely, hypocrite wuss democrat!"
     
  9. Medman74K5

    Medman74K5 Registered Member

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    I normally use AC Delco in the Blazer and Bosch Plats in the car. Right now I'm using Accel header plugs and wires, seem to be working well. There a little shorter which makes them easier to change if you run headers.
     
  10. 1bad82k5

    1bad82k5 1/2 ton status

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    I really like my ac rapidfires. Other than those i would use either a standard ac or an ngk vpower. I have had good luck with all of these, but ac rapidfires are definitely my favorite.
    eric

    Hell, it don't really matter....it's just for my race car.
     
  11. BlazerGuy

    BlazerGuy 3/4 ton status

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    Plain ol' AC Delco works best for me

    Murphy's Laws on Life :
    "The longer you wait in line, the greater the liklihood that you are standing in the wrong line." [​IMG]
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I've tried everything else, and anything besides ACs is a waste of your money. All they've got to do is fill a hole and make fire, and the ACs do that well for a dollar.

    My buddy runs a top fuel race boat and they've got 16 spark plugs in that motor. They run autolites because they're cheap and they go through a lot, so that's what they run.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  13. ChevyCaGal

    ChevyCaGal 3/4 ton status

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    I'm using Split Fires for now and they seem to work fine... got them on sale so I thought I would try them... as for the code, L, M and H, check your Vin to find that out. That'll tell you what you have... it should be the 8th spot in it that tells you. It's a code for the engine type, producer and RPO.....

    "Suck Fumes Ford Boy"
    "I love my country, I fear my government"
    <A target="_blank" HREF=http://www.chevycagal.homestead.com/steph.html>http://www.chevycagal.homestead.com/steph.html</A>
     
  14. pcorssmit

    pcorssmit 1/2 ton status

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    I had Accel U-grooves, every time I pulled a wire one of the contacts was loose (they screw on). Put in standard AC Delco's, can't tell any diff' performance-wise. Good enough for the general....

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     

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