Here is a 38 to 47 fitting compared to a 36/37 fitting. See the difference in the hole size. It is a .030 difference. My bike has reproduction baby food jars on it, and they have the later style return lines, I figured since the lines were bigger, I should run the later fittings. I think that modifying the fittings will help me make the bike a little more oil tight. I will know this weekend.
Here is a pic of the modified fitting. I brazed the end of it, then I drilled it with a .090 drill in the lathe, then reinstalled them. The logic behind this is ----> 36 and 37 ELs have the same amount of vacuum as later bikes, I think that the smaller hole will make the suction stronger, and hopefully suck more oil out of the baby food jars.
Here is a pic of the modified fitting. I brazed the end of it, then I drilled it with a .090 drill in the lathe, then reinstalled them. The logic behind this is ----> 36 and 37 ELs have the same amount of vacuum as later bikes, I think that the smaller hole will make the suction stronger, and hopefully suck more oil out of the baby food jars.
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