No don't have to loosen front
Also, if I decide to move the back of the engine towards the port side (which is what I think I'll do), I obviously have to loosen the trunnion pins on both rear engine mounts. But do I need to loosen the front ones also? I'm thinking I shouldn't but I'm not sure.
I guess my answer is why would you not want to have a properly aligned engine to propshaft when you can and are supposed to? Less vibrations on your vdrive, tranny , motor, cutlass bearings,boat. imo And the real speed guys are big on this.
Also, what will happen if I continue to leave it as it is? It's been like this for 4 seasons now and to my knowledge, it's not causing any issues.