Patrick,

YES, they are a bolt on.  Easy as unbolting the old rockers, change the studs
to the ones provided, add some shims, bolt on new rockers, Adjust to one turn
in after contact, change stock rocker covers with a set of clip on (same as
stock) deep aluminum valve covers.

Then drive with more power...

I even made a web to show how to install them.

If you add the bigger valve heads, change the pistons to 95 mm big bore to
create a stronger pull on the intake or you will lose low end power.  If you
only clean up the casting marks on the intake ports and do not increase size,
then just blend in the larger valves under the seat. You might retain low end
power.

Robert