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430 cat removal help

Discussion in '360/430' started by swc5150, Nov 15, 2023.

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  1. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    727
    Wisconsin
    Full Name:
    Scott Calderwood
    #1 swc5150, Nov 15, 2023
    What's the secret to separating the manifold from the cat? The back nut just spins with the bolt. I've used all the rust buster I have on it. Using 2 little wrenches is not working as can't get any leverage. I'm ready to Dremel out the bolts at this point.
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  2. tmvatlanta

    tmvatlanta Formula Junior

    Mar 26, 2017
    389
    Covington GA
    Full Name:
    Tam V.
    #2 tmvatlanta, Nov 15, 2023
    I don’t think there’s any secret. I had no issue when replacing the manifolds with the AP headers. I did use a swivel ratchet extension for the correct angel to break it lose.


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  3. Sj_engr

    Sj_engr Formula 3

    Sep 15, 2020
    1,624
    San Jose
    Full Name:
    dc
    #3 Sj_engr, Nov 15, 2023
    Dremel will work. You can replace them with Titanium bolts via Amazon (at least in the states).

    M8 washers
    M8x65 bolts
    M8 locking nuts
     
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  4. mike32

    mike32 F1 Veteran

    May 13, 2016
    5,968
    Isle of man- uk
    #4 mike32, Nov 15, 2023
    If they will not come out then just cut them, new oem nuts + bolts are very cheap. The springs are expensive so do not damage them. Make a note of how much of the bolt thread comes out the nut so you know how much to tighten them putting back
     
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  5. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    727
    Wisconsin
    Full Name:
    Scott Calderwood
    #5 swc5150, Nov 15, 2023
    Thanks guys. I'm giving it one more try tonight before resorting to anything too drastic.
     
  6. Scottslaw

    Scottslaw Formula Junior

    Jul 9, 2015
    602
    Instagram: Needmoregarage
    #6 Scottslaw, Nov 15, 2023
    I hope you don't take offense at this suggestion, but just to make 100% sure, you are countering the nuts at the back (towards the front of the car) with a wrench or socket while you attempt to loosen the bolt head facing toward the rear of the car, right? If you don't then the bolt will just spin. Just wanted to make sure. You may need a thin wall socket to get it on the nut toward the front of the car. good luck!
     
  7. swc5150

    swc5150 Formula Junior
    Rossa Subscribed

    Jan 5, 2021
    727
    Wisconsin
    Full Name:
    Scott Calderwood
    #7 swc5150, Nov 15, 2023
    Oh yes, I'm double wrenching it and/or socket and wrench.
     
  8. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,601
    San Carlos, CA
    Full Name:
    Mitchell Le
    #8 yelcab, Nov 15, 2023
    Dremmel with gusto. It releases your frustration,
     
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