Also See:
Nissan recommends re-torquing the head gasket bolts ever twenty-four months (every two years):
1972 USA Owners manual
Retighten cylinder head bolts, manifold nuts & carburetor securing nuts.
Part Numbers
Nissan Competition
Nismo head gaskets for Nissan A series motor A12,A13,A14,A15 Engine
- 11044-M0822 t=0.8 79.0 mm bore diameter
- 11044-M0823 t=0.6 80.0 mm bore