interesting thread
Repco engine developments ( in Australia ) made a flat plane crank for their F5000 engine
it was part of the Repco Holden F5000 project
( the engine was an Australian made 308 ci V8 , by the Australian devision of GM —- called GMH )
these engines made over 500 hp , but had the vibration issues that have been discussed
I came on the scene after they had been used ( 1973/4 ) so the stories are second hand
needles fell off the tacho , the fuel tanks were part of the monocoque chassis. ( befor bag tanks ) and the vibrations caused them to leak , the driver complained of his vision be blurred.
the were reported to sound Fablous @ full noise , and were only used in competition for a very short time ,may be only once .
Repco was known for some of their other projects —- Repco Brabham , powered Jack Brabham F1 cars