'Ya know,
"common wisdom" always says, "be sure to keep pushrods mated to their original positions when rebuilding an engine". I've also heard "replace one, replace them all".
I've never really understood either one of these. If the pushrods are correct for the engine, and you adjust the valve clearance properly, what's the difference?!
I say, check 'em all carefully, both ends, check that oil is getting down to the tappets, replace just what needs replacing, adjust them all (warm), and re-check 'em after running it a few times.
I guess the bigger question is, "why are 3 bent or broken?!"
Have you done a compression test? Are you confident all the valves are moving? Seems like a bent or broken pushrod spells a stuck valve (or jumped timing?)
Someone far wiser than me will correct me soon, I'm sure . . .
-Michael
