Here is a an open-side link to pictures of WayneK’s first shown 4 cylinder engine system:
You can scroll up on that topic and read his trialing and decisions making. One post above this he links directly into his internals step by step building of it.
Scroll down and see him loading work it. Stills pictures and three videos.
And adding in his refinements; and use-proofed modifications.
S.U.