Engine movement question

[Charles in SC]

How much does an engine move at the rear vs the prop end. I have a IO-360. The reason I ask is that the stainless oil line on the co-pilot side that is the line to the prop is about 1/2 inch from one of the engine mount tubes. I do not think it moves much at the rear but wondered if someone can confirm this. Thanks in advance!

[rvsxer]

That line is always tight going through there. 1/2" should be plenty. Just check it for any signs of chafing after it's run a bit. That's what I did.