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Help with 82 720

Nissan rust

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Physically they are so close to the same it's hard to tell by looking. The Z22  uses a cast valve cover while the Z 24 is stamped steel but they interchange. Because of the 3/4" difference in height the top 2 front L&R timing cover bolts are differently spaced. The Z24 head has squarish intake ports and matching intake rather than round on the Z22 but you can't see this. The engine identifier is stamped just below the head, on the top of the block between the two pair of exhaust pipes...



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