I have a 5.7gi Volvo Penta. I took the cylinder heads to the machine shop to have a valve job done. I believed them when they told me that they would mark all the brackets and bolts in the heads and put them all back as they were. Well I am too trusting and not smart enough to realize until after I had torqued them in place that the number 3 & 4 cylinders are marked below the spark plug hole. so my question is is there any reason I need to switch the heads back to the opposite sides except for the cylinder numbers being wrong and having to move the temp.sensor. 
mad:and of course the bolts and brackets that the machine shop reversed)?
mad:and of course the bolts and brackets that the machine shop reversed)?