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Difference in 351 blocks- truck versus marine

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  • #1

    Difference in 351 blocks- truck versus marine

    What's the difference in the blocks?

    I have a 93 Mastercraft ski boat with an Indmar (Ford) 351, GT40 heads, etc. The motor is all original with approximately 800 hours on it, and I'm getting some blowby through the breather. I have a stock '97 roller block in the garage, which I've already torn down. Previous owner dropped a valve, trashed a piston.

    Could I build this bottom end & swap it over to the boat?

    Has anyone used a marine 351 in a car & noticed differences in the casting that forced some modification?

    Any help is appreciated.
    Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

    Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."
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  • #2
    I dunno the specific answer, but one of my best friends has been running a "regular" 302 in his boat for almost a decade, and the primary use has been pulling wakeboarders, so it hasn't just been putting around the lake.

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    • #3
      I had a 351w block that was ready for a 408 kit, I sold it to a member here. I don't remember much extra webbing or anything but it seemed a little heavier but I have no idea if it was.
      "It's another burrito, it's a cold Lone Star in my hand!"

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      • #4
        Also some of the marine stuff is reverse rotation.
        "It's another burrito, it's a cold Lone Star in my hand!"

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        • #5
          Originally posted by dee View Post
          Also some of the marine stuff is reverse rotation.
          I googled it after posting here, and read that if it had a timing chain, it was regular rotation, if it has timing gears, then it's reverse rotation. Of course, I can run it now & see which way it spins to know for sure.

          I read that marine head gaskets are key, since it's not a closed system, and draws it's cooling straight from the water it's in (freshwater all its life).

          Because it's such a moisture rich environment, and it runs so cold (140 degrees, average, but when we were at speed, it was down to 120) I'm sure there are special parts to be found with the pistons & rings (?). I thought I read something about that last night, at least for the pistons.
          Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

          Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."

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          • #6
            Run stainless head gaskets. I don't have a clue about the rotating assembly when I picked mine up it was bare.
            "It's another burrito, it's a cold Lone Star in my hand!"

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            • #7
              i just got off the phone with Indmar, and they said the rotating assembly should be the same guts you'd find in a truck motor, barring the cam (I presume).

              I would think that I could find a machine shop locally that could answer that, since we have a couple of lakes & large boat dealers.
              Ronald Reagan:"Government's view of the economy could be summed up in a few short phrases: If it moves, tax it. If it keeps moving, regulate it. And if it stops moving, subsidize it."

              Homer: "Bart...there's 2 things I know about women. Never give them nicknames like "jumbo" or "boxcar" and always keep receipts...it makes you look like a business man."

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