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REVISED CYL HEAD & BLOCK ON 1987-UP ENGINES |
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April, 1987 production, the cylinder heads and block have been changed on Nissan 3.0L (VG30) engines. Improvements were made to increase power output and decrease noise levels of the engine. Revised production engines can be identified by an engine serial number that ends in W, such as XXXXXX W. Former engine serial numbers end in either A or B. However, factory service cylinder blocks will not carry the W identification even though they feature the improvements listed below. A visual check is necessary for proper identification. Six new water galleries were added to the cylinder block (Figure 1) and the cylinder heads (Figure 2). This change required a modification of the cylinder head gasket, where the original 6 water holes were downsized and 3 new holes added on the exhaust side of the gasket (Figure 3). The revised cylinder head gasket can also be identified by its differing identification tab. Figure 4 best illustrates the former and revised head gaskets. Additional changes were made throughout the engine. The pistons now use full floating, larger diameter wrist pins. The small end bore of the connecting rod was increased to accept the larger wrist pin. The revised rod is also heavier than the former part. Again, components are identified by a W stamp
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