1975 500cid exhaust manifold
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  • 1 Post By Chevyrocks
The Classic Cadillac Forum Discussion, 1975 500cid exhaust manifold in Past Cadillac Vehicle Discussion; ...
  1. #1
    Chevyrocks is offline Cadillac Owners Member
    Automobile(s): SedanDeville 1975
    Join Date
    Apr 2013
    Location
    Quebec City, Quebec, Canada
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    1975 500cid exhaust manifold

    Hi everyone!

    I'm a 20 years old Caddy lover from Quebec (not very good in english, please forgive me ), I've owned a 72 Fleetwood and last week I've bought a 75 SedanDeville with the 500cid engine
    The car was straight-pipe (exhaust cutted after the downpipe) so it was too noisy for ride peacefully in downtown with cops that don't really like the noisy cars XD
    So I've made install an exhaust and muffler on the Caddy and surprise: the straight-pipe loud noise hids a really wonderful cracked manifold noise...

    I must fix it but for that I must find a new exhaust manifold but according to the guy of muffler shop, it doesn't exists...
    I've quickly checked on the net and I think he's right
    So how can I do?
    Does somebody know a place or a website where I can find a manifold?
    Must I buy two headers with dual exhaust? ($$$$$$$$$$$$$$$)
    Is it possible to fix original cracked manifold with a weld? It should be really easier...

    Thanks in advance, I'm very disappointed and I hope there is a cheaper solution than the headers
    Have a nice day
    Loīc

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  3. #2
    Roadmaster75's Avatar
    Roadmaster75 is offline Cadillac Owners Member
    Automobile(s): 1978 Eldorado Biarritz
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    Re: 1975 500cid exhaust manifold

    You can try to have the thing welded, but that takes some real talent.

    There ARE places to buy reproduction manifolds and I recall them being about $200 US dollars.

    They Potter or MTS for starters. IF they don't have them they probably know where they are.
    I betting it's the driver's side ... right?

    Be EXTREMELY careful in removing your manifold ... The bolts can easily break off requiring you to
    remove the head ..... In fact, if you are not in a hurry .... Just remove the head & have an engine shop
    remove them for you. Much easier removing head bolts than trying to work out those rusted frozen bolts out
    without breaking them while they are still deep inside the engine compartment....

  4. #3
    Chevyrocks is offline Cadillac Owners Member
    Automobile(s): SedanDeville 1975
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    Apr 2013
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    Quebec City, Quebec, Canada
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    Thread Starter

    Re: 1975 500cid exhaust manifold

    Wow, great! Thank you really much for your answer!
    I did'nt think to this other problem, I didn't think it was so hard to extract this "fossilized" bolts
    Great thanks for the Potter and MTS tracks, I'll check them too, all the solutions are good to know and review!! :-D

    I've found two manifolds on eBay, what you think about it everyone?
    http://www.ebay.com/itm/220909648887...887%26_rdc%3D1
    http://www.ebay.com/itm/1968-1969-19...648887%26#shId
    The first one is new and the second is remanufactured, I'm wondering if the new is an OEM part or a jobber...

  5. #4
    Chevyrocks is offline Cadillac Owners Member
    Automobile(s): SedanDeville 1975
    Join Date
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    Thread Starter

    Re: 1975 500cid exhaust manifold

    I've purchased the new one
    http://www.ebay.com/itm/220909648887...887%26_rdc%3D1

    I will take the gasket on Rockauto, someone knows Rockauto?
    Are they fast acting for ship items?
    superjeep likes this.

  6. #5
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
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    Dutchman in Germany
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    3,897

    Re: 1975 500cid exhaust manifold

    Hey, if anyone needs one again, check out cad500parts.com. They have what you need. Either custom ($495 for set both sides) or a replacement ($295) for the left hand side header (that is most prone to cracking).

  7. #6
    70eldo's Avatar
    70eldo is offline Cadillac Owners Connoisseur
    Automobile(s): 1970 Eldorado.
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