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I just looked up headgaskets for a 90-91 lude and it’s an exact match to the one I had … why is that? My car is an 89…
The B20A5 engine was available for all 3rd gen Preludes from '88 thru '91. For '90/'91 models, the Prelude 2.0 Si came with the B20A5 engine. The Prelude Si came with the B21A1. So it stands to reason that a HG for a 90/91 lude could match the one you had.
 

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The intake ports are shaped differently. There should also be different casting marks on them, but I forget what those marks are. I haven't done actuall 3rd gen wrenching for several years. Take a look through the FAQ sticky. There's a lot of information there that can help with this. Between the FAQ sticky and prelude3g.com, you can learn everything you want about 3rd gen Preludes.
 

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@ttcheung97 is right. Match the head gasket to the head, not the block. And like he said, the casting marks I referred to in my earlier post are PK3 for b21a1 head. A b20a5 head would be marked with PK2.
 
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