A valve lash adjustment on a C-14 is not for the impatient. It is modestly demanding, does take a bit of finese and I think some previous internal engine experience, and is a time consuming task due to all the things you have to do to get ready to actually adjust the valves. Also, there is a tricky part where you have to use the cam bearing caps to force the cam down against some of the valve springs- it is not really addressed in the service manual but it must be done slowly and deliberately or you can crack a cam bearing cap runner (one person that I know of has done that).
As to whether or not it is something you want to do yourself, that is entirely dependant on whether or not you have a competent dealer nearby and what your own labor is worth to you.
There is little reason to plug the air injection system on the C-14- it will not yield any more power or performance. It seems that most people who do plug it are those who have an aftermarket exhaust and hear deceleration popping; the popping was always there but cannot really be heard with the stock exahust system.
As far as tires, most of use seem to be using Pirelli Angel GT's, or Michelin Pilot Road 2 or Pilot Road 3s on our C-14s with excellent success. I have used all three with and have been happy with all but my favorite is the PR3 for the combination of stickiness, longevity, and especially, retaining good handling manners while wearing down. The Angels are good, and quite sticky but do not yield the same mileage although they are considerably less expensive so that is probably a wash but what I found to be a bit on the poor side is the way the handling deteriorated quite significantly even before the tire was half- consumed.
Brian
Is it realistically worth trying to adjust the valved on the 08 c14 "land shark", or simply take it to the dealer. I can easily remove the valve cover and check the clearance, but have never removed cam's and done the nasty. If anyone in the sacto area likes teaching this skill to a rookie, I'm game and can supply taisty beverages for the endeavor. Also, in keeping with my run on paragraph's, I plugged the air suction house with a rubber plug, and i am wondering if removing all the smog equipment and reed valves is worth the trouble? Thank's for any help you may offer. Lastely, anyone recommend a dual tread compound tire for the connie, with sticky sides and decent mileage in ze middle.