My 91 prelude si timing belt snapped on me and I found another head which is a b21a1 for sale and i need a b20a5. I also heard that this will work but it raises the compression though. is this true or not?

thanks for the help or could use any advice?

 

I think it depends on how much the head will be decked.

 

The Prelude B-series is the odd man out. Unfortunately, the standard b-series compression calculators will not work.