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620 Part # Thread


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Top head with round exhaust ports is a W58 used on the '78-'79 620, S10 200sx, A10 HL510 and the 1980 720. The other could be anything but the W58. Look on the spark plug side along the bottom edge between spark plug #1 and #2 for the ID. Probably a U67. Either can be used but best if this head matches the head that was on your L20B.



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