it the fronts wiggle a lot of feel like clicking or popping, it could be balljoints.
a slight wobble on a rear wheel you wont feel unless you are on a really smooth surface going a decent speed. but you have the right way to check it if you wanted to confirm if its the wheel or the axle.
the problem with the spacer is it will cause a place for it to leak.
Not sure if they make a thicker head gasket but you could get by some with that. i dont think it will be enough to bring you down to pump gas range.
i dont care what motor or compression you have, plugs arent supposed to back out. you have another issue,
and if you lock the plugs in. it is just going to do damage to the pistons, domes, and rod bearings, whichever is the next weakest link.
yes, the axle and broth rotor and sprocket hub swap between it all. only think you need is a round house carrier JJ&A normally has refurbs for pretty cheap, and a brake stay to hold the caliper in place. i bought JDS's sprocket and rotor guard kit since i dont have a skid plate.
i have different tread pattern sunf rear tires and dont have any issues with them yet. granted i only have them because they came as part of a deal with wheels.
best way to do it is to get some larger CC domes. with a cool head, they have to make one for those cylinders. Sponsors on here can help you with the correct setup.
JDS customs is a big SLP guy/dealer, SLP is what i have on mine. i have had t6, LRD, and now SLP, slp pull the best from the low end and have the longest pull. they are comparible to CPI but more on the lower RPM scale from what i remember.
t6 are good for a stock motor, but the moment you upgrade anything they choke you down, Paul turner Mids, or SLP's will preform well and leave the door open to not holding you back when you do mod it. they are both low/mid range pipes.
i personally would cancell or return them and buy bushing ones. just because they will last longer and ride better plus you will have customer service. these are like full flights, they will be around for 5 years, and then Poof, they are gone, and your stuck.
they are open, grease will attract dust making it wear out faster, a dry lube is best. you can swap them out with other rod ends, but at the end of the day, they are still rod ends.