500 - production power decrease and engine changes?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 3 of 3
500, 472, 425, 368 Discussion, 500 - production power decrease and engine changes? in Cadillac Engine Technical Discussion; During the production time of the 500 engines their power has been significantly decreased due to emission control requirements. Does ...
  1. #1
    Corto is offline Cadillac Owners Member
    Automobile(s): 1975 Eldorado
    Join Date
    May 2010
    Posts
    2

    500 - production power decrease and engine changes?

    During the production time of the 500 engines their power has been significantly decreased due to emission control requirements.

    Does anynody know what exactly has been changed, year after year??
    (heads, cam, introduction of EGR, carb set-up,.....?)

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    drmenard is offline Cadillac Owners Connoisseur
    Automobile(s): 95 fleetwood 81 deville
    Join Date
    May 2003
    Location
    Massachusetts
    Posts
    1,007

    Re: 500 - production power decrease and engine changes?

    The lowering of the compression ratio was the main reason for the lowering of power output. But if you are looking at the book numbers they changed the way they calculated them in the early 70's.....68-69 had the highest ratio and 1970 was just a little lower.. then in 71 to 76 had the lowest ratio.. changes in the block in 1970 were made for better oiling...small chamber heads were made until 1973 were better than the larger chamber heads that were made 74-76....pistons must be matched for the heads you use....

  4. #3
    zonie77 is offline Cadillac Owners Connoisseur
    Automobile(s): 94 ETC,97 STS
    Join Date
    Sep 2003
    Location
    Arizona
    Posts
    3,531

    Re: 500 - production power decrease and engine changes?

    Often the cam timing was changed by changing the timing gears. Do some research, if so a pre emissions timing set will give more power.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting