Bryan Fuller engineered a 854 cubic-inch V-16 by joining two LS3 V-8 engines, reportedly producing around 1200 horsepower for a custom roadster designed by Hot Wheels. The project draws inspiration from the 1938 Cadillac V-16 Series-90.
The critical engineering challenge involved firing order. Fuller explained that running two V-8s with identical timing causes destructive piston misalignment. The solution clocks the rear engine back about 45 degrees, allowing the 16 cylinders to fire in proper V-16 sequence. A single starter spins both engines, and a giubo joint (flex disc with rubber or urethane center and metal mounting plates) mates the engines together. Three CNC-machined plates provide structural connection along the center valley and lower sides.
The LS3 platform simplified ignition tuning. Two computers and individual plug wires handle spark, while a single Meziere water pump circulates coolant through both engines to one radiator. A heavily modified Holley intake supplies air, with further modifications expected during chassis integration.
A Tremec T-56 Magnum transmission, optimized by Bowler Performance Transmissions with polished internals, transmits power to the wheels. The powertrain sits on a custom-built display table while awaiting the Roadster Shop to complete the chassis. Timeline for final assembly remains unclear.