Been testing 3/8LP 325 and full 3/8 on that echo 490 that was blind ported by local. He got it little rough on the base on a corner area, but the dirko for base seal got her running good. Base needs about another .020 off it for tighter squish.
Newer 440Model? Some of them have updated oiler lines. I even tried dirko around some and it slowed them down.
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I take care of a couple 440 local. Never seen one just leak out. Just normal dripping from running and shut off.Newer 440