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Different Oil Pan Gaskets?

Discussion in 'The Garage' started by 68 Suburban, Nov 30, 2002.

  1. 68 Suburban

    68 Suburban Registered Member

    Apr 9, 2002
    Likes Received:
    Phoenix, AZ
    Did chevy go to a different type oil pan in the mid 70's that called for a different oil pan gasket? Is there a way to tell which pan is on an engine? Are the pan's interchangeable between engines with the different pan? I think the end gaskets got thicker in 74 or 75? Any info would be great, thanks.
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

    Jul 23, 2000
    Likes Received:
    E-town baby!
    There were two changes that I'm aware of. Around 79 the dipstick was moved to the passenger side of the block. Previous to 79 the dipstick was on the drivers side.

    In 86 or 87 they went to a one piece rear main seal.

    There are a few companies making a re-usable rubber one piece pan gasket now. It's a little more expensive than the regular gaskets but pays for itself with less frustration.

  3. Beast388

    Beast388 1/2 ton status

    Nov 6, 2001
    Likes Received:
    Clinton, IA USA
    To quote "Small Block Chevy Peformance", they state:

    "Oil pans used on 1974 and earlier engines accept a front seal that's a 1/4" thick. Beginning in 1975, oil pans were built to accommodate a 3/8" thick front seal. To identify which seal a pan is designed to accept, place a straightedge across the pan rails and measure down to the seal surface. A dimension of 2-1/4" indicates an early pan and a thin seal; if the measurement is 2-3/8", it is a late pan which accepts the thick seal. Either seal can be used with either pan, but if the wrong seal is used, it will become obvious very quickly."

    To clarify that last sentence, either pan will fit on any pre-'87 small block, but you need to match the correct front seal to the pan. /forums/images/graemlins/thumb.gif /forums/images/graemlins/burb.gif /forums/images/graemlins/usaflag.gif

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