[Walt Fricke]

I keep hearing about 150+ psi compression numbers. I've never seen that on my engines, though. So I satisfy myself with looking for consistency, and good leak downs.

The oil consumption does look like worn valve guides.

If you change pistons to something with higher compression, you for sure need to confirm that you won't have valve to piston interference issues. This is normally done by doing a dry, partial assembly of the engine, and measuring clearances with clay. The same is usually done for the piston to head clearance, especially the quench area at the circumference - too little may lead to interference at high RPMs and an inadequate quench ares. Too much leads to an inefficient quench. However, maybe someone has done this for the piston (you need to specify what it is)and cam and head (yours are the stock E?). If you have the head mating surfaces machined to true them all, you can compensate for this by using thicker cylinder base shims. Are these mating surfaces damaged? Clearance/quench issues can be dealt with by adjusting base shim thickness, or in some instances by machining the piston or head in this area. However, maybe your combination has none of these issues.

Absent pitting or obviously unusual wear, reusing the rockers on their same cam lobes is pretty common. However, it is not all that expensive to send the rockers off to be refaced and rebushed. At that point you don't need to worry about which rocker worked which valve. I had Cgarr do this for a bunch of mine. He sent a couple back because they were too damaged or far off to be reground.