Originally Posted by Snoopy

b16/b17 blocks are actually 8-10mm shorter than b18 blocks. so it will hang lower on b16 blocks if designed for a b18.

a b16b shares the same block as a b18. so again, a header for that will hang lower on your b17. just get a header designed for a b16a or b17 to avoid any potential problems.

it's confusing i know, but honda's weird like that. :dunno: