430 Engine

Discussion in 'Wet behind the ears??' started by Emanuel Bader, Feb 21, 2024.

  1. Emanuel Bader

    Emanuel Bader 67` GS 400

    Hi everyone, I have the prospect of purchasing a 430 block.

    I have the idea of rebuilding an engine and leaving my original 400 engine as is.

    Can someone tell me if a 430 engine fits my 67 GS A body?

    As far as I know, the 400, 430 and 455 are the same blocks, but are the engine mounts all the same? According to the Internet, the 430 was only installed in B, C and E body?!

    Thanks for your advice
    FLGS400 likes this.
  2. DaWildcat

    DaWildcat Platinum Level Contributor

    Externally all three interchange, so exchanging your 400 for the 430 is no problem. You're correct, there was a GM corporate-wide "rule" limiting intermediate size cars to ~400 cubic inches until 1970. So, prior to '70 only the big Buicks got the 430. For 1970 the limit was removed - Buick, Olds and Pontiac released 455 engines for the A body cars, Chevrolet the 454.

  3. Emanuel Bader

    Emanuel Bader 67` GS 400

    Hey Devon, sounds good. Thank you!
    PGSS and DaWildcat like this.
  4. 436'd Skylark

    436'd Skylark Sweet Fancy Moses!!!!!

    As a guy who has a rebuilt 430s and 455s, I can tell you its a bit cheaper and easier to do a 455. The 430 piston choices suck... both are doable, but depending on your goals you might be better off waiting for a 455..
    Last edited: Feb 21, 2024
  5. DaWildcat

    DaWildcat Platinum Level Contributor

    Good advice, Joe. Wasn't too bad when I bought 430 pistons last time...but I think that was 1990!

    I, too graduated from 430 to 455 after that; at the time it was simply to gain more displacement.

  6. Emanuel Bader

    Emanuel Bader 67` GS 400

    Good to know!

    I actually plan to bore the block to 455. But sourcing parts for the 455 also seems to be difficult.

    TA aluminum heads and other parts will be a challenge these days.

    But I have time, my GS is running well at the moment and I have enough to do on my Ford project...

    If I can get the 430 cheaply, I will buy it, and if it is good, I will use it for the conversion and leave my 400 original.

    FLGS400 likes this.
  7. Nailhead in a 1967

    Nailhead in a 1967 Kell-Mnown Wember

    I know about a 430 in the Netherlands that will be overhauled in the next couple of months.
    Maybe the builder also knows about a 455 to overhaul, he just sold one the other day.

    This is the 430:


    And this is the fresh 430 that my mate bought from the engine builder, next week I will drop it into his 1973 Century Regal:

    FLGS400 and Emanuel Bader like this.
  8. Bens99gtp

    Bens99gtp Well-Known Member

    I dont know if there is actually enough meat in walls to bore a 430 all the way to a 455.......they are the same externally and drop in interchange from 400/430/455. Heads swap around......but i think the internal casting around the walls is different for all the motors.......so do some homework to see if a 430 can be bored .125
    Emanuel Bader likes this.
  9. DaWildcat

    DaWildcat Platinum Level Contributor

    Good advice on boring. I remember, too, reading the 430 can go to .125, but probably not any more than that. Cylinder wall thickness testing will tell all.

    Emanuel Bader likes this.
  10. Emanuel Bader

    Emanuel Bader 67` GS 400

    You're right! It would be quite risky and involve a different test. It would be better to get a 455. In addition, the price in the auction was so high that I couldn't keep up.
  11. Emanuel Bader

    Emanuel Bader 67` GS 400

    The engine looks great! Let me know if anything comes up about a 455

    Thank you

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