Hi GB,
Somethings not right
Why the noise appeared after some distance is peculiar??
Have you rechecked the tappet clearance?
I assume you checked the pushrods for straigtness? and that they were all the same height once installed
Did you turn the engine over and watch each pushrod rise and fall
If the rocker is that far "up" it might hit the cover? or because the angle is no extreme a pushrod is fouling something
Or a rocker is fractured ??
Last but not least
Once or twice I have come across a situation where the top edge of the piston(s) clout the head gasket
It don't half make a racket
John
PS
Just saw your latest post,
I need to go look see what could lead to endfloat on the cam?? ( I have a SA case with the cam fitted
in stock)
If the cap is too far one way or other the followers may get tangled with the wrong lobe??
As I said before they do not match up 100%