Ah, that's where it went! Knew I saw it somewhere, just got lost along the way... Thank you.
I remembered wrong about the number being on the outside and I'm not planning on taking the head off until the thing is complete and road worthy. The engine runs pretty well as is.
Is there some other way I can tell the specific model? I'm thinking it's an S but the mud flaps throw me off. Did the other Maxis come with mudflaps?