Not Ranked
Ant,
The 400 C motor was one of a couple that FoMoCo gave to PDL to repower the transporter with if my memory serves me. Dont happen to know if that car is still around do you?
Funny how storys get around, Last time I spoke with a US based engine builder whos opinion I respect it was the Ford/SVO stuff that had distortion/machining issues! Dart was deemed to be one of the better products.
On the valve springs , yes visual and look real hard- inner springs/dampers in particular along with the whole upper head area for any small pieces that may have broken off. When you set the lash the ends of the stems should have a definite mark where the rocker roller tip runs or perhaps a couple when the valve has rotated slightly. If there is no definite wear pattern it means that your valve spring is not correct for the application and allowing the valve to rotate in the guide which means the keepers/retainers are coming loose at some point in the cycle. This applys only to race type setups,not road going applications where some valve rotation is desirable.
Jac Mac
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