A B16 head is mostly mentioned for being improved for forced induction as it's improved movement figures when compared to the B18. On the other hand, a B18 head is usually ported and polished to obtain similar flow figures as one from the B16. Look through from the extensive collection https://jdm-honda-replacement-eng15790.like-blogs.com/29494834/5-easy-facts-about-b16-crate-engine-described