I got my old engine at 48K miles, & noticed the number one exhaust valve didn’t seem to open as much as the others. The engine lasted until 111K miles, & spend 20 year resting since.
Now I have extracted the cam & can see the No1 exhaust cam lobe is warn. Also all the cams are domed ( the cam followers hollowed & some broke)
General diameter of other exhaust circles 28.2 (1.11 inch) Max Cam lobe heights 33.1mm /34.0/33.80 (1.31inch)
But Max height of No1 cam lobe is only 30.65mm (1.20inch)
So where as the best exhaust lift was 5.8mm.. No1 Exhaust only lifted 2.2mm (86tho’ inch). Not ideal !
With an aim of rebuilding a standard engine….
Is that too much damage to “reprofile” ?
Shall I make it into a steampunk candle stick?
To get another cam, will later xflow/fiesta/ka Ford Kent cams fit ?
Worn cams and followers, and broken followers, while not common are far from unknown. Personally, I would replace the cam rather than have it reprofiled, but check lobe height, obviously.
I’m running a crossflow camshaft in the Prefect and it works well. But be aware that the transverse engine blocks, and camshafts, are a few inches shorter than the inline engines so you cannot fit those.
The numbers are not my specialist subject, but I think the 711M block was a high performance variant of the crossflow 1600 one. But really, you need to ask others on this one; after 105E/109E/113E/120E, I get a bit lost!