P1 SuperStock Repowers With Mercury Racing

Series Transitions to all-new 300R V-8 Four-Stroke for 2019

July 26, 2018

Mercury Racing has announced that the Powerboat P1 SuperStock outboard racing series is repowering for the 2019 season with its new 4.6L V-8 four-stroke 300R outboard. P1 SuperStock presented by Mercury Racing is a one-design, single-engine race series. The 300R will replace the Mercury Racing 300XS as the exclusive power for the series for both domestic and international venues.

“We are very excited to continue our presenting sponsorship of the P1 SuperStock Championship. Their professionalism and focus is second to none,” said Mercury Racing general manager Stuart Halley.

“It is exciting to have our consumer products used in this highly competitive, one-design racing environment. There is no better way to prove their performance and durability,” said Steve Miller, director of marketing, sales and service for Mercury Racing.

Mercury Racing 300R
The 300R will replace the Mercury Racing 300XS as the exclusive power for the series for both domestic and international venues. Courtesy Mercury Racing

The naturally aspirated four-stroke 300R V-8 powerhead provides a 44 percent increase in displacement compared to the two-stroke 300XS model while maintaining a comparable weight as its two-stroke predecessor. The weight savings can be attributed to state-of-the-art powerhead components, including composite intake runners. That, combined with four valves per cylinder and the DOHC valve train, enables the new four-stroke to generate unprecedented torque and unmatched acceleration from the lower end of the power band up to maximum engine speed, while operating on 87-octane (90 RON) pump fuel.

P1 SuperStock will feature 300R models with the Heavy-Duty midsection with a factory installed rear tie-bar mounting plate and side steering bracket assembly. The Heavy-Duty midsection features solid mounts and robust, forged transom brackets with single-ram power trim and a remote trim pump designed to endure the harsh offshore environment. The side steering bracket provides a robust, integrated steering installation.

The surface piercing Sport Master gearcase, designed for boats capable of speeds in excess of 85 mph, features low-water pick-ups and a crescent leading-edge for maximized efficiency and speed. All P1 SuperStock boats will be equipped with hand-crafted Mercury Racing Rev 4 XP propellers for precision matched race competition.


The 300R is backed by a three-year factory warranty with up to three years of Mercury Product Protection for a possible six years of warranty when used in recreational boating applications.

P1 SuperStock CEO Azam Rangoonwala said, “The P1 Panther race boat is at the heart of our SuperStock championship and strategic partnerships are an integral part of our business model, so the relationship with Mercury Racing is hugely valued. Embracing the latest technology by upgrading to the 300R outboard will not only increase racing performance but also maintain parity within the series.”


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