429 help
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500, 472, 425, 368 Discussion, 429 help in Cadillac Engine Technical Discussion; heat risers i believe they are. I have a 66 deville and coming out of the heads are 8 pipes. ...
  1. #1
    87cadibrome is offline Cadillac Owners Member
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    429 help

    heat risers i believe they are. I have a 66 deville and coming out of the heads are 8 pipes. 4 on each side. they merge into larger pipes running parallel with the valve covers? what are these? what do they do? and how can i get rid of them?

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  3. #2
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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    Re: 429 help

    They sound like they are part of the air injection system, which was for emmissions. Do they eventually hook to an air pump that is run by one of the V-belts?

  4. #3
    87cadibrome is offline Cadillac Owners Member
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    Re: 429 help

    not sure, they are capped at the top of the larger rails. would the original repair manual have information and pictures of this? been looking into getting one off ebay

  5. #4
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
    Automobile(s): 2005 Escalade 6.0L 2WD, 2007 Jeep Grand Cherokee Limited CRD
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    Re: 429 help

    Yeah, the FSM would tell you what that was.

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