Machine a dummy proving piston for the initial test machine work and to test the piston mounting jig.
Dummy piston in place using the donor block for convenience and to keep the partially built new block clean,
Taking some clay impressions to test piston to the edge of the combustion chamber clearance ad to test valve clearance.
Piston mounted in the machined Jig / mounting plate.
Head test fit with two valve rockers for clearance tests.
Engine test fit for linkages.
Drilling and wires for new switches.