swaping in a 350?
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 10 of 10
500, 472, 425, 368 Discussion, swaping in a 350? in Cadillac Engine Technical Discussion; Hello I have a 78 coupe deville, that I was thinking about swaping out my 425 for a 350 chevy. ...
  1. #1
    smilesyota is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Posts
    9

    Talking swaping in a 350?

    Hello I have a 78 coupe deville, that I was thinking about swaping out my 425 for a 350 chevy. Has anyone done this swap and how do the motor mounts and exhaust manifolds fit?

    thanks Joe

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    MMNineInchNails's Avatar
    MMNineInchNails is offline Cadillac Owners Enthusiast
    Join Date
    Jul 2003
    Location
    San Clemente, CA
    Age
    27
    Posts
    989

    Re: swaping in a 350?

    Why?!?!?!?!?!?!

  4. #3
    smilesyota is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Posts
    9

    Re: swaping in a 350?

    the 425 is a slug. It's torguey but mine is getting old and it is easier to build a 350 to whatever kind of power that you want.

  5. #4
    davesdeville's Avatar
    davesdeville is offline Banned
    Automobile(s): 1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
    Join Date
    Aug 2003
    Location
    Albuquerque, NM
    Age
    26
    Posts
    7,971

    Re: swaping in a 350?

    Why settle for 350ci when you can have 500?

    You need a 500. It's essentially the same block, and will bolt straight in. You'll have 300hp and >450'#s right there. Need more? http://www.500cid.com http://www.cad500parts.com

  6. #5
    Vern is offline Banned
    Join Date
    Jan 2003
    Location
    Dayton, OH
    Posts
    23

    Re: swaping in a 350?

    I think it is Cad company that sells a ready made little brother 425 trade in, 433ci that makes like 400HP & 500TQ for reasonable. (As far as crate engines go) AC, cruise, fuel lines, carb linkage, motor mounts, tranny, exhaust hookups etc etc all hook right up change to a sbc and you change all this stuff also.

    Plus you would need all your altenator, power steering, fan etc for sbc and make the shroud work and the list goes on. For what? To have a lesser motor that won't live as long, make as much power or torque but was cheaper to buy. Yes you can buy the chevy crate cheaper but at what cost? I am not anti chevy or ill aware of the chevy virtues. But did you know a 425 or especially a 472 or 500 can ROCK as a hi po street motor?

  7. #6
    smilesyota is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Posts
    9

    Re: swaping in a 350?

    Thanks for the info. Do either of these companys make an intake for the 425? I have found a 75 500 in a calais for 200$. This is a low compression motor only slightly more powerful than my 425. My question is, what year heads would I have to put on this motor to raise the compression to around 10.5:1? This motor is complete and sounds like a good deal.

  8. #7
    lux hauler is offline Cadillac Owners Connoisseur
    Join Date
    Jan 2003
    Location
    Ohio
    Age
    44
    Posts
    1,258

    Re: swaping in a 350?

    The only smaller combustion chamber head for the 500 is a 76cc head. It was used from '68-'73. The problem with swapping heads is, you'll end up with compression MUCH higher than 10.5:1. I think I remember someone saying that late pistons with early heads will net compression in the 12 or 13:1 range.
    You can, however use the 425 heads on the 500. I believe the chamber size is 96cc's. The problem with the 425 heads is that they don't flow very well and are only good for low RPM applications on a 472/500.
    You CAN get 10:1 compression with early heads but you have to change the pistons to do it.

  9. #8
    smilesyota is offline Cadillac Owners Member
    Join Date
    Nov 2003
    Posts
    9

    Re: swaping in a 350?

    Thanks for the info, the yard I found the 500 at has a 73 472, but that sounds like a little too much compression for a daily driver! Thanks for the help. What are you putting your 500 in?

  10. #9
    lux hauler is offline Cadillac Owners Connoisseur
    Join Date
    Jan 2003
    Location
    Ohio
    Age
    44
    Posts
    1,258

    Re: swaping in a 350?

    Is the 472 a running motor? If it is, I'd snag it and run it. Same block, just not as many cubes.
    My 500 is going in a '72 Chevy truck.

  11. #10
    Vern is offline Banned
    Join Date
    Jan 2003
    Location
    Dayton, OH
    Posts
    23

    Re: swaping in a 350?

    The 73 472 was an excellent motor. I would consider putting in a new timing chain, fresh oil pump, MTS-10 cam or equivalent and an Edlebrock intake and go. Oh yea have distributer curve kit put in and send the 472 Q-jet to The Carb shop for a cheap (relative to buying new) stage II rebuild set up for your car/combo. Frankly you and your buddies will flat crap how well and strong it will run. Compared to a sbc in that car you will say WHAT WAS I THINKING! Oh yea you will say hey I didn't know. Life is good with a big Cad under the hood

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