Pictures of the very powerful OMC 2 liter V6 looper purpose built race engine.

Here it is..the OMC race engine/powerhead Cees van der Velden and Renato Molinari used to win many 2 liter UIM ON class World Championship titles.
I had the opportunity to race a Team Saffa ON boat 1978 for Renato Molinari in Italy with this type of engine.
The OMC 2 liter V6 looper engine was way more powerful then the Merc 2 liter engine but OMC never made very many. Instead they built the 3 liter looper with carb and fuel injection for the OZ class and later the famous F1-V8 engine.
Velden won the ON World title 1975 in Cardiff, GB..see pictures below (the #1 boat) Fred Hauenstein was a big part of developing this engine.
1979/1980 Molinari won the ON World title using this type of power.

First picture #12 below is Cees van der Velden in Paris 6 Hours 1975 running a new cross-flow 2 liter V-6 from OMC.

The second picture #29 is me (Lasse Strom) driving the Molinari/Saffa/Johnson V-6 RS 2 liter at Idroscalo, Italy September 1978.