Download 1989 Nissan 300ZX Intake Manifold Service Manual – Fig. 1: Intake Collector Removal Sequence Fig. 2: Intake Manifold Removal Sequence Fig. 3: Exhaust Manifold Removal Sequence Fig. 4: Exploded View Of Cylinder Head Fig. 5: Cylinder Head Bolt Tightening Sequence Fig. 6: Removing & Installing Timing Belt Covers Fig. 7: Timing Belt & Pulley Installation Inspection. Check cylinder head for cracks, flaws or damage. Inspect cylinder head and block mating surfaces for warpage. Warpage limit is .004″ (.10 mm). If beyond limit, resurface head. Maximum surface grinding limit of head and/or block is .008″ (.20 mm) total. Replace head and/or block if machined or warped beyond service limit.