What are the cams need to reposition during reversing of engine?

•   Starting air distributor cam
•   Fuel injection pump cam
•   Intake v/v cam (4 stroke)
•   Exhaust v/v cam …..in relation to the crankshaft(4 stroke)
• In 2 stroke no need to change exhaust v/v cam because in 2 stroke engine exhaust v/v opens and closes symmetricaly about BDC which means the degree at which exhaust v/v opens is equal to the degree at which exhaust v/v close
• Also now 2 stroke engines have scavenge ports so no cam to change