It is so hard to find anyone who has actually worked on a c27 not just assuming it is like all other honda motors.I am getting mixed answers to two questions I am hoping you can answer.First are the valve tappets adjustable?I could not see any adjusters with the top and side covers off but it is a limited view.Second is the intake reasonably port matched to the head or is it an airflow restriction point? thanks for any info you can pass on.