Four Cylinder Mercury Thunderbolt

[xp1000]

What was the highest horse power and last year that Mercury produced this motor? :confused:

[Mark75H]

The highest power of a 40 ci Thunderbolt is 40 hp

The last year was 1961 as the "Merc 350"

The "Super" Thunderbolt 44 ci version was made much longer and made 50 hp