The block could not hold vacuum on the 4x4 diaphragm side due to a leak due to a bad o-ring or gasket on the stem. Had to rotate the old body a bit to fit this one, the stem is a bit shorter and wouldn't turn on the switch even if I move the stem by hand, and the angle of the vacuum ports puts stress on the 25 year old vacuum lines, which isn't so is great. I made no changes to the new actuator, so no mishandling issues were caused. Just a bad product. I recommend spending $80-$90 to get a quality block and stay away from this or anything similar with angled vacuum ports.
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