Will work with all L28 blocks with round exhaust ports. This is a builder. It has to be gone thru. You can not bolt it on and go. This is pretty much a complete takeoff with most everything on it. This meaures 4.262 inches or 108.25 mm. This head has sat in storage for a long, long time. I turned the cam easily. This head has no obvious flaws. Only thing I see is some corrosion by one of the water ports. In any case I guaranty this to be a good useable head. Just let me know if it is not. The item "Datsun 280Z Z N47 Cylinder Head-Complete…