Hello all, a good friend recently purchased a barn find all original 20,000KM 1985 GTV 6. The car has sat in storage for 30 years and is in great shape. After getting it started, the engine sounds like a tractor! Noise seems to be coming from the passenger side valve area. We removed the valve/cam cover and manually turned the engine and everything looks great. Was planning on measuring the exhaust clearances but I am not sure what else to check.