I've searched and can't find answer - I want to replace this bolt - I'm ordering parts in advance of teardown, I understand there are 17 short bolts and 1 long one, which type is the exposed one under the exhaust ports??

Thanks,

 

D-oh, I should mention it's and s-4 13B NA

Thanks,

 

OK, figured it out - ther are 17 short bolts and one long one.
The one 'long' bolt is the one with a logo on the head - bottom position on the spark plug side. Therefore the exposed bolt on the other side is a short one, same as the other 16.