OK that's cool man, i bought this engine last year D16B5. the only application that they were produced for were 99-00 civics. The catch is, it's contructed to run on natural gas. It's a California Engine that was only made for those 2 years.

Now if you look at this motor, the engine looks exactly like it's gasoline-powered counterpart: the D16Y8.

I'm wondering if the only the fuel system is the only difference which would allow me to just swap out intake manifolds and be ''good to go"

i'm thinking that the block and the head and internals are the same.

I need my theory to be solidified.

Any help would be appreciated.