Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Hot Vs. Cold Plugs - Advice Needed

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1986Blazer, Oct 30, 2001.

  1. 1986Blazer

    1986Blazer 1/2 ton status

    Joined:
    Jun 13, 2001
    Posts:
    511
    Likes Received:
    0
    Location:
    Key West, FL - Southernmost Point
    I just replaced the plugs on my 86 350. I used AC Delco R43TS (gap .043). The manual calls for R45Ts (gap .045). What is the performance difference. Has anyone used both of these and if so what is the difference? Thanks for letting me know.

    <a target="_blank" href=http://www.geocities.com/keywestk5/KeyWestK5.html>http://www.geocities.com/keywestk5/KeyWestK5.html</a>
    So I says to him, I said, "get your own monkey."
    1986 K5, 350 GM Crate, 700R4, NP208
     
  2. zakk

    zakk 1/2 ton status

    Joined:
    Sep 21, 2001
    Posts:
    4,762
    Likes Received:
    0
    Location:
    San Jose CA
    i do not think there would be a noticable performance gain at all. Just make sure they are the right ones for your application [​IMG] I would use factory specs to gap them unless you have a mildly warm'd over engine or aftermarket heads. I gap mine @ .045 and it runs fine

    -Zakk
    '77 K5 SB 400 TH350 NP203 p/t 6" Lift D60 14BFF 4.10's 36"Wrangler II's

    [​IMG] CK5's MOAB 2002 OR BUST!! [​IMG]
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

    Joined:
    May 30, 2001
    Posts:
    17,669
    Likes Received:
    0
    Location:
    IL, USA
    See above. I couldn't agree more. Unless you have detonation problems, use the stock heat range plugs.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    Could someone explain the whole heat range thing to me. I have wondered about this for a while. How does it work, and what is best for an MSD ignition system? I had a buddy with a 600+HP BBC and he had to run plugs that were 3 steps cooler form stock. Does it all depend on what the engine like? Is it a trial and error thing? Thanks

    Harley

    My Chevy isn't broken, its just out of gas.
     
  5. RedDwarf

    RedDwarf 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    816
    Likes Received:
    0
    Location:
    North Central Florida
    Heat range is just a measure of how fast the plug can dissipate heat. "Colder" plugs dissipate the heat quicker. This can help eliminate mild pinging problems, whereas fouling can be reduced by going to a "hotter" plug. "Hotter" plugs won't make more spark or give you any more HP.

    Like has been said, in most cases, stock is best.

    Still Poundin' "pavment" after all these years!!! [​IMG]
     
  6. DesertDueler

    DesertDueler 1/2 ton status

    Joined:
    May 23, 2001
    Posts:
    3,106
    Likes Received:
    0
    Location:
    Phoenix, AZ
    I run plugs 4 steps colder in the firebird when I race on nitrous. I cant use them on the street because they foul to quickly. Trust me I already tried because I got sick of switch them out every friday. No as for performance gain, there is no performance gain. I have run stock heat range plugs on motor, and then the ones 4 steps colder. I ran .05 seconds quicker in the 1/4 mile with the colder plugs. If you can feel that 1 horsepower then go for it. But be ready to switch the plugs out more ofter because they like to foul out quickly.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  7. Zepplin

    Zepplin 1/2 ton status

    Joined:
    Aug 29, 2000
    Posts:
    920
    Likes Received:
    0
    Location:
    Bay City, MI 48706
    Check it out:
    http://community.webshots.com/user/zepplin1976
     
  8. BIGRIG

    BIGRIG 1/2 ton status

    Joined:
    Feb 29, 2000
    Posts:
    488
    Likes Received:
    0
    Location:
    Independence, MO
    hey that is one sweet site all kinds of info..plus I 'm more of a picture guy anyway! ;)


    MY DRINKING TEAM HAS A FOUR WHEELING PROBLEM![​IMG]
     

Share This Page