A couple of months ago I picked up an Evo Softail Heritage. I've spent some time and a few bucks detailing it. The head bolts that are visible, particularly the rear one that's easily seen, are off color and rusty. Is it possible to replace them one at a time while still in place, of would I need to retorque all 8 of them? Any hands on experience out there?

 

I wouldn't. You run the risk of improper torque sequence that could lead to gasket failure... Try these instead... Chrome covers. Many do it and they look great.. I have them as well....
harley-cylinder-headbolt-covers

 

+1 Leave them alone and put covers on them - that's your best bet. Harley has a lot of nice covers as does the aftermarket.

 

Put chrome head bolt covers on them!!

 

Will do, thanks