Here is 2 used titanium exhaust valves. They are 11/32 stem, 1.910 head and 6.530 long. They weigh about 108 grams. They are the square groove type.
2 Used 11/32 X 2.355 X 5.705 Titanium Intake Valve MANLEY DEL WEST
Hourglass Lightweight Aluminum Engine Spacer 1/2" I.D. x 1-1/2" O.D. x 1/2" Long
Hourglass Lightweight Aluminum Engine Spacer 1/2" I.D. x 1-1/2" O.D. x 2" Long
JEGS 82051 Line Clamps -8AN (1/2 in.) I.D. 1 1/2 in. L x 1/2 in. W x 11/16 in. H
Hourglass Lightweight Aluminum Engine Spacer 1/2" I.D. x 1-1/2" O.D. x 1" Long
Hourglass Lightweight Aluminum Engine Spacer 1/2" I.D. x 1-1/2" O.D. x 1/4" Wide