Piston 1 At TDC - Compression:
- Crankshaft: 0 degrees
- Camshaft: both marks align with camshaft cover surface
Piston 4 At TDC - Overlap:
- Crankshaft: 180 degrees
- Camshaft: intake cam mark - left side - aligns with camshaft cover surface
- exhaust cam mark - right side - points straight down