Left Cylinder Head Assembly - 1990 300ZX Z32

When rebuilding Nissan's legendary VG30DETT, sourcing a straight left cylinder head is critical for Z32 restoration. The genuine 11002-30P10 assembly fits all 1990-1996 300ZX Twin Turbo models, though junkyard hunters should verify the casting mark "30P" embossed on the exhaust flange. Before purchase, inspect deck flatness with a straightedge and check between intake and exhaust valve seats for hairline cracks—a common failure when overheating occurs. During installation, always replace head bolts (Torque-to-Yield) and follow Nissan's spiral torque sequence: inner bolts first in three progressive steps to 72 ft-lbs, then outers. Apply liquid gasket at the front cam journal caps. While JDM Fairlady Z heads interchange mechanically, USDM emissions systems require specific EGR port provisions. Never install VG30DE naturally aspirated heads (11002-30P00) on turbo blocks, as valve spring rates and combustion chamber volumes differ critically, risking piston-to-valve contact and compression ratio mismatches.