If memory serves me, Russ Collins 3 motor machine Atchison, Topeka & Santa Fe (AT&SF) was actually an (A/Fuel) injected nitro run without any blower.
The Scorcerer (pictured reply #100) had 2 SOHC engines tied together in a V shape with a single modified GM blower feeding both, but they used individual crankcases.
The single crankcase/crank for 2 blocks was designed for Kawasaki KZ stuff by a fellow in the midwest. Russ never had an SOHC setup for one, but I don't remember if this was the basis for 'Battlestar', the rear engined bike. That was to use Goldwing type heads.
Russ didn't run in the 6's with either of those bikes, and 7.30 second/199.55 mph (I looked it up) was Scorcerer's best mph. Terry & Byron ran the first 200 at OCIR.
Russ did have some success with Bill Miller's (BME) Top Fuel car, qualifying at quite a few races. The Pomona blow over put an end to that.