The 1961 35X had needle bearings front and rear. The 1963 35X had a needle bearing in the rear only. The 1964 36X had needle bearings. The 1965 36X had ball bearings. The 36X was designed for combat use but never called a combat special. OS made an old 50 with a needle front bearing and it was a sport engine.
The first Fox "combat special was the 1956 "35" combat special. Then the 1958 "35" combat series II. Then the 1960 series III combat special. The next was th 1974 Combat "36" special MkII
All Fox combat specials were called combat specials. The 36X wasn't. Doesn't mean they weren't used in Combat because they were. That's what I used them for.
Johnson made a combat special, the JCS, and it was sold as a combat special. He also made a ball bearing engine, the JBB, which was an excellent combat engine. That was my preferred combat engine in the 60's. It wasn't a combat special though.
Super Tigre G21/29's and 35's were great combat engines but not sold as combat specials.
Again, no Fox 36X was sold as a "combat special".
Short quick history of Fox combat engines