hot header pipes and stock manifolds

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500, 472, 425, 368 Discussion, hot header pipes and stock manifolds in Cadillac Engine Discussion; I have a 75 500 in a 46 Caddy. It has an Edelbrock intake, a quadrajet from a 425 to ...
  1. #1
    ssrodder is offline Cadillac Owners Member
    Automobile(s): 12 CTS AWD, 1948 conv, 06 sts4
    Join Date
    Apr 2006
    NE PA

    hot header pipes and stock manifolds

    I have a 75 500 in a 46 Caddy. It has an Edelbrock intake, a quadrajet from a 425 to be able to use the electric choke, 260 degree Comp cam with stock 500 exhaust manifolds. Even after insulating the floor, the floor boards get warm. I have installed high temperature header wrap on the header pipes and used a heat gun to check the temperatures of the pipes. I am getting a reading of almost 400 degrees on the pipes and higher on stock exhaust manifolds. What could be causing such high temperatures. Is my carb running too lean?

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  3. #2
    drmenard is offline Cadillac Owners Connoisseur
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003

    Re: hot header pipes and stock manifolds

    ON my 472 the exhaust manifolds are over 400 degrees, so I think you are ok... But I love my PLX wide band to let me know my air fuel ratio... so for about $250 there is no guessing... they make a lot of fancy things... but there cheapest one works great...

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