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Thread: 5% pulley with stock HG's

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  1. #1
    Join Date
    Jul 2004
    Location
    Outskirts of Richmond Virginia
    Posts
    100

    5% pulley with stock HG's

    145K miles, with stock, 1993 factory head gaskets. According SCP, a 5% pulley wont harm the HG's... but I'm not sure. Anyone else run this combo?

    Also using a stock Jackshaft (these things are like $300?!)

    I'm assuiming I would need a new belt too, huh?

    Its a COMPLETLY stock engine, (except removed silencer) with 5-speed.
    Last edited by TealThunder; 07-24-2005 at 11:44 PM.

  2. #2
    Join Date
    Aug 2002
    Posts
    443
    Well, a removed silencer is not gonna be enough to save your headgaskets if you do go with a 5 percent SC pulley. You should at least do exhaust. If you do not, you are really at risk of blowing your HG's! I had a full exhaust done, no cats, and stainless steel magnaflows (2 mufflers and resonator) put on for 600 bucks, way cheaper than new HG's. I would at least get rid of, or get better flowing cats before you mess with the pulley.

    I'm sure much more knowledgeable people than I will chime in soon to tell you the same.

    Good luck!

  3. #3
    Join Date
    Sep 2002
    Location
    Ensenada B.C. Mexico
    Posts
    1,223
    i removed my cats and intalled a magnaflow resonator when i installed my 5% pulley, and my head gaskets lasted like a year or more , but they blew because my radiator cap was failing.

  4. #4
    Join Date
    Apr 2002
    Location
    St. Charles, MO
    Posts
    20,886
    Quote Originally Posted by TealThunder
    145K miles, with stock, 1993 factory head gaskets. According SCP, a 5% pulley wont harm the HG's... but I'm not sure. Anyone else run this combo?

    Also using a stock Jackshaft (these things are like $300?!)

    I'm assuiming I would need a new belt too, huh?

    Its a COMPLETLY stock engine, (except removed silencer) with 5-speed.
    The head gaskets are going to fail no matter what you do, IMO another 5% of overdrive isn't going to have much impact on how long they last. Stock belt is fine for 5%.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  5. #5
    Join Date
    Apr 2002
    Location
    Madison, Ohio
    Posts
    17,532
    What David said. Your headgaskets are already shot. How fast do you want to do them in? Temperature is the #1 factor followed by detonation and lean AF mixtures. Exhaust back pressure is not your primary concern.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  6. #6
    Join Date
    Apr 2002
    Location
    Philly
    Posts
    2,420
    Quote Originally Posted by David Neibert
    The head gaskets are going to fail no matter what you do, IMO another 5% of overdrive isn't going to have much impact on how long they last. Stock belt is fine for 5%.

    David
    I agree with David. I blew my head gaskets @ 92k with stock blower pulley and headers and 2.5" dual exhaust. I ran this set up for about 30k, so take it for what it is worth.
    Good Luck
    Ken
    1992 Thunderbird SC
    13.322 @ 102.81
    1993 Thunderbird SC 5spd..white
    2002 F350 SD Diesel (SC tow vehicle)

  7. #7
    Join Date
    Feb 2005
    Location
    Chandler, AZ
    Posts
    228
    just make sure to do the exhaust. i took too long to get my exhaust done after i put on my 5%. my head gaskets are fine (well they blew for a different reason), but i blew an exhaust gasket because of the pulley. exhaust then pulley.

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