Ultimate Database/FAQ of the 500 | 472 | 425 | 368 - Page 2

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

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
Page 2 of 2 FirstFirst 1 2
Results 16 to 17 of 17
Like Tree1Likes
500, 472, 425, 368 Discussion, Ultimate Database/FAQ of the 500 | 472 | 425 | 368 in Cadillac Engine Discussion; A tidbit of info on the 368 engine. Often overlooked because it's so darned hard to see.The EFE valve which ...
  1. #16
    SafariOne is offline Cadillac Owners Fanatic
    Automobile(s): 1981Cadillac Fleetwood Brougham D'Elegance Coupe m
    Join Date
    Mar 2008
    British Columbia

    Re: Ultimate Database/FAQ of the 500 | 472 | 425 | 368

    A tidbit of info on the 368 engine. Often overlooked because it's so darned hard to see.The EFE valve which is on the exhaust manifold, passenger side.The purpose is to direct hot exhaust gases through the intake manifold during cold startup. The shaft on this valve must be kept lubricated and moving freely because it is operated on vacuum only.Some of the symptoms of a sticky or non functioning EFE are as follows. Poor operation at start-up(rough idle, stumble) Poor operation after warm-up (lack of high speed performance,surge,miss at all speeds) The EFE is controlled by the TVS (Thermostatic Vacuum Switch) on the 6.0 and electronically on the 4.1 engine. The TVS is located on the left front of the cylinder block . Make sure the vac. lines to the EFE are sound and have tight connections.

  2. #17
    67SDV472ci is offline Cadillac Owners Member
    Automobile(s): 1967 sdv with 73 472
    Join Date
    Jan 2015
    Just something i learned. Frankenstein-ing caddy bigblocks. 425 heads on a 472/500 will add compression.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

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

Please enter a valid email address for yourself.

What Cadillac(s) do you own? (Or type NONE)

Please select your insurance company (Optional)

Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.


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.


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