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500, 472, 425, 368 Discussion, What would you do? in Cadillac Engine Technical Discussion; You can't bore a 425 to 500. you're lucky to get it even 60 over. The 425 block is also ...
  1. #16
    Angela Desmond is offline Cadillac Owners Fanatic
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    You can't bore a 425 to 500. you're lucky to get it even 60 over. The 425 block is also lighter weight than the 472/500 blocks. They supposedly removed the weight from "unimportant places". As for all this talk about the 425 crank, I had a discussion with Al at MTS about that when I first took on this project and he was saying that those cranks are not as weak as some believe. He said his expierience was from racing them and most of the talk about the weakness of the crank was coming from bench racers. Me, being new to the world of Caddy motors, took his word for it. Hard to argue with a guy that has one of the few speed parts places for Caddy motors in the whole world. But, as for nitrous, I stayed away from it in a 425 also.

  2. #17
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    Sure the 425 crank won't just crack, but it can't be stressed too much. Seems to me nitrous would be a bad idea. Anyway even if I could bore out my 425, I need a running car to get around in. I may have found a good local 500, I need to check on that one..

  3. #18
    Angela Desmond is offline Cadillac Owners Fanatic
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    You're preaching to the choir on the nitrous, that's why I didn't go that way on my 425. A small amount probably wouldn't hurt but I wouldn't use a 150 H.P. nitrous kit on it. I wonder if those cranks could be sent out to be nitrided. Or is it toughtrided. One of them is outlawed, but I forget which one. I'm sure Katshot knows.

  4. #19
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    Angela,
    1st i have to say that i admire you I don't know ANY women that "build engines" and "Teach Boxing" > My hat is off to you!

    Have you tried the Spark plug with the 4 electrodes on it to see if you had enough clearance in your cylinder head? I saw one at Auto Zone the other day, it may have been made by Bosch, im not sure but it was a strange looking spark plug. The thicker head gaskets and different plugs would probably work > check out one of those spark plugs and let me know what you think.

  5. #20
    Angela Desmond is offline Cadillac Owners Fanatic
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    Sorry I haven't let you guys know whats going on with this fiasco. I sent my pistons back to Ross to be re-machined to MY specs. I called Federal Mogul, the parent company of Champion and they gave me a plug which is slightly less protruding in the combustion chamber, but after the pistons are machined, the stock plugs will fit just fine...By the way, the person at Ross that talks turkey with you about piston dimensions and the general mechanics of a piston is also a woman. Her name is Jane... And being a onetime professional boxer I've met a lot of women boxers

  6. #21
    oyoung is offline Cadillac Owners Member
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    Re: What would you do?

    Angela
    I have followed mostly all of the posting on this and other boards but you seem to be more involved in the cad 425 than most, I to am intrested in the 425 cad for a number of reasons #1 being weight.So i've been waiting and watching for your posting of the progress of your project,I hope I'am not being to forward.believe I'am not trying too.

    oyoung

  7. #22
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    Re: What would you do?

    Dude.... nearly 2 and a half years ago this was posted! I remember it ....

    Angela hasn't been around for a loooong time.... haven't heard anything about her since..... she is the only person that I know of that was doing a real high performance build on the 425, she also used to live like 20mins from me back in NY.... wonder where she is now...

  8. #23
    Night Wolf's Avatar
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    Re: What would you do?

    BTW.... weight isn't a reason to pick a 425 over a 472/500... the weight difference is IIRC around 25lbs... nearly nothing. Throw the Edelbrock intake on a 500 and you are already under the weight of a stock 425.

    Angela went with the 425 for the simple reason that it was free and she had it around. I was interested to hear the results on that engine also.

  9. #24
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    Re: What would you do?

    It seems like an awesome engine she had going. Way before my time though.

  10. #25
    oyoung is offline Cadillac Owners Member
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    Re: What would you do?

    Night Wolf I guess I should notice the date on some of these posting,anyway the 1977cad S/M states that the 1977 425cu.engine is 100lbs lighter than the previous engine which was the 500cu.

  11. #26
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    Re: What would you do?

    Alright, so after an eddy, will 75 lbs lighter really be all that much of a difference?

  12. #27
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    Re: What would you do?

    I have a couple years of reading on me now... If there's a great reason you need ~100 pounds, and you are not shooting for a whole lot of power, a 425 might not be a bad choice. Plus you can pick them up for damn near free since most everyone goes for 500/472s. Anyway what're your goals with the vehicle and engine?

  13. #28
    Night Wolf's Avatar
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    Re: What would you do?

    100lbs?

    I remember it was just a lighter block and crankshaft... on CB7 I remember reading 25lbs or so.. I could be wrong.

    Even if it was 100lbs... the 500 has more power out of the box, and go-fast parts will do more, that should negate the extra weight....

    but if weight really is a concern, then the 425 is a fine engine... its a fine engine in either case, just outshined by the 472/500.

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