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Help reverse engineer Flatty with full flow oil filter

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  • Help reverse engineer Flatty with full flow oil filter

    I have a friend that bought a rebuilt Flatty...125 over, merc crank, relieved, aluminum heads, dual carbs. For some reason he does not want a full flow oil filter system. I'll take the modified parts then. Are there any step by step instructions on how these are normally modified so I can help him reconvert it back to stock. Thanks in advance.

  • #2
    Common practice on flatheads is to not use the filter system and change oil every 2-3 thousands miles depending on usage.

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    • #3
      Agreed, the most common way to add filter is drill a hole into the gallery then let part of the oil flow through the filter. My last 8BA build (full race balanced stroked bored , ported relieved etc etc etc) I just change oil every 3K and drive the ears off it. Runs just fine for a lotta miles.
      I did this on the advice of one of the premier flathead machinists in North America as thats how he runs his blown flattie.

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      • #4
        That's why I'm trying to help my buddy out. He bought a motor already modified and he wants to undo the filter system and he asked me to help. I just keep thinking....."no good deed goes unpunished". I know obviously the pan and oil pump was modified. My biggest concerns are if oil galleys were opened, closed, enlarged, or restricted to do the mod.

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        • #5
          Is it actually a full flow system, meaning ALL the oil from the pump is directed through a filter? Because that's different than what bentouttashape describes, taking partial flow from a gallery....
          Maby some pics?
          My build thread:
          https://www.killbillet.com/forum/20s...at-is-it/page7

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