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Thread: D vs D2 Cylinders

  1. #1

    Join Date
    Nov 2020
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    Default D vs D2 Cylinders

    My 0290 has D2 cylinders on it bought from Gibson's a few years back. Can someone tell me what the difference is between a D cylinder and a D2? Not talking about lifters, high compression piston's etc) just the cylinders themeselves.

    Thanks
    Scott

  2. #2
    gliderman's Avatar
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    Jan 2009
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    Red Deer,AB Canada
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    Default Re: D vs D2 Cylinders

    look at the fins between the intake and exhaust ports- if they have a upside down "V" shape they are a D2
    if the fins are straight the are a "D'

  3. #3

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    Default Re: D vs D2 Cylinders

    Yes, I know they are D2 cylinders. I was just wondering what the difference was, and why one is preferred over the other.

  4. #4

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    Default Re: D vs D2 Cylinders

    Answer found by calling Marshall at Gibson's in Oklahoma (who provided the cylinders for a top end back a few years). The D2 cylinder has the intake valve openings (he used a different word) of the 0320. Simply put, they breathe a bit better. Of course this has nothing to do with hydraulic vs solid lifters or high compression pistons that are on the D2 engines.
    Scott

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