With a little bit of custom work, all the exhaust clearances are set between .37mm(.0145") and .38mm(.015")
With a little bit of custom work.....
Not a huge deal, but the measurements are taken @ the cam lobe, but do to the fact of the SR20's design, where the shim is a rocker ratio away from the measurement, it is very possible to go from too tight a clearance to too loose a clearance and in only .001"(.25mm) shim. 5 shims were "adjusted" up to .0005" using 600grit, then 1000grit wet/dry on a flat surface so that clearances could be kept close to the agreed upon specification.
Shims are set, this head is ready to be sent back to its owner.......