Nissan L28 3.1L Modified N42 Cylinder Head Ported Heart Chamber L6 Japan Please refer to the photos and the following description for the item’s condition and details. This is a tuned cylinder head based on the L28 N42, previously used on an L28 modified 3.1L engine. The combustion chambers have been reshaped into a heart shape through argon welding to improve combustion efficiency. The head has been machined for big valves measured approx. 45-46mm intake / 36mm exhaust and port polishing has been performed. However, there are pinholes present in the areas that were argon welded. The previous owner reported that the head was used without issues, but we have some doubts regarding long-term reliability – please make your own judgment. Due to this, the item is offered at a lower price than the market average. The combustion chamber itself is neatly finished. Some parts such as valves, valve springs, retainers, and valve guides are partially missing. Please check the photos carefully to confirm condition and completeness. Compatibility: Vehicle: Skyline 2000GT (3.1L spec) Engine: L28 modified to L31 (N42 type). This item is 100% authentic, official Japanese goods. Please be assured that each item is carefully packaged to avoid any damage. Only the items shown in the photo are included. Nothing else is provided. We accept managed payments. We are located in Japan. It is our pleasure to make you happy by offering our recommended items. International Buyers – Please Note. We do not declare items below value or mark them as “gifts” – US and international regulations prohibit such behavior.