With the pistons complete with piston rings and connecting rods, they can be installed in the engine. Ensure the cylinder bores are perfectly clean by wiping the cylinder walls several times with light engine oil and a clean, lint-free cloth. Lubricate the connecting rod bearings and install them into their appropriate rod and rod cap, ensuring the tang on the bearing fits into the notch in the rod or cap. Lightly coat the pistons, rings, and cylinder walls with light engine oil. To prevent the threaded bolts from possibly damaging the cylinder wall or crankshaft journal as the piston/rod assembly is pushed into place, install a length of rubber or plastic tubing over the connecting rod studs on one rod assembly. Check that all the piston ring gaps are positioned properly. Verify that the piston/rod assembly is correctly positioned, with most pistons marked with an 'F' or a drilled-out area indicating the front of the engine, and ensure the rod bearing tang slots are towards the outside of the engine block once installed. Place a piston ring compressor around the piston, with the base of the compressor about 1/4 inch above the bottom of the piston skirt, and tighten it until the rings are flush with the piston surface; gently cap the outside of the compressor to ensure the rings are fully compressed. Push the piston assembly into the bore, using a wooden hammer handle to tap the top of the piston slightly, and hold the ring compressor solidly against the cylinder block until all rings are inside the bore, continuing to push until the connecting rod is near its installed position. Ensure that all bearing surfaces and the crankshaft journal are coated with engine oil, then remove the tubing protector pieces and install the connecting rod bearing cap (with bearing) to the connecting rod. Torque the nuts to specification and repeat this procedure for all cylinders, using the rubber or plastic tubing on each assembly to prevent damage as the pistons are pushed into place, rotating the crankshaft as necessary to make the connecting rod nuts accessible for tightening.