Forget rebuilding a 307! Get a 350! - Page 2
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5.0 and 5.7 Discussion, Forget rebuilding a 307! Get a 350! in Cadillac Engine Technical Discussion; Cool... Wonder if it is the same block they used in IRL, they are 4L, but not sure if they ...
  1. #16
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: Forget rebuilding a 307! Get a 350!

    Cool... Wonder if it is the same block they used in IRL, they are 4L, but not sure if they have to run production blocks or were able to use GMPP blocks.

  2. #17
    The Ape Man's Avatar
    The Ape Man is offline Cadillac Owners Connoisseur
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    Re: Forget rebuilding a 307! Get a 350!

    Quote Originally Posted by 0to60n4.5 View Post
    I have a fuel injected 403 in my 79' Seville with 10.5 c/r and a big cam .

    Back in the day when I started the project ( 15+ years ago ) it was going to be a fast Sedan. Nowadays they make tons of Sedans that most likely will run circles around whatever mine might have become.
    Kewl beans. I fought with original Cadillac EFI back about 15 years ago also. Tried introducing a controlled vacuum leak in the line to the MAP sensor. Tried screwing around with ECU reference voltage. Tried increasing fuel pressure by carefully squashing the pressure regulator in a shop press with some large sockets as fixtures. Yes I'm crazy. Nowadays there's Megasquirt. 4L80E too.
    403 is a kickass engine. Largest small block.

  3. #18
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: Forget rebuilding a 307! Get a 350!

    A friend of mine is messing with a MSII. I'll take my LT1 PCM anyday..... It is limited, but has lots of potential.....

  4. #19
    joe_padavano is offline Cadillac Owners Member
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    Re: Forget rebuilding a 307! Get a 350!

    Quote Originally Posted by N0DIH View Post
    Cool... Wonder if it is the same block they used in IRL, they are 4L, but not sure if they have to run production blocks or were able to use GMPP blocks.
    Nope. The IRL motor is different from the production blocks. The IMSA motors ARE production-based.

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