However, it will be in the form of an outboard motor.
As promised, Honda's 350hp V8 is here:
hondanews.com
Interestingly, it is a VTEC design...
As promised, Honda's 350hp V8 is here:

Honda Marine Debuts All-New BF350 Outboard Company’s First V8 Motor Available Commercially, Flagship Model Offers Premium Power and Unparalleled Performance for Extraordinary Boating Experiences
Headlining preparations for the upcoming International BoatBuilders Exhibition & Conference (IBEX) in Tampa, Florida, October 3-5, Honda Marine announced today the introduction of the Honda BF350, the newest high-power outboard motor to join its comprehensive lineup.

Interestingly, it is a VTEC design...