ZZ13
Well-Known Member
His are the 450 Diamonds. Not many 420s out there with them, but if anyone could find one, Alex could.Also re read up above that AlexF says he purposely found 450 mechanical engines for his choice of power in the 420 model he has. So I wonder if his are the 450 diamond's?
The remedy for the valve issue is replacing the head with a new version that Cummins developed to solve the failed seat issue. And of course pitching the props to burn fuel like a 450 Diamond (basically give up that little extra hp provided by the 480CE). Most that had the failure on one engine also went and did the preventative head replacement on the other engine. Some have gone ahead and done the preventative head replacement on both engines to avoid the failure.