Hydraulic Oil Service Plugs Large Medium Small Sizes Multi Pack Rubber Drip Proof Hose Plugs Industrial Hydraulic Kit for Irrigation, 3 Sizes(35 Pcs,Orange)

You can put the camshafts in at what would be TDC, using the timing marks. But I'd still verify timing when you go to put the chain on. For plugging the holes, I love these I use them at work and they are pretty great.