Questions about valve lifter rotation...

[Chris Bamford]

Are Model T valve lifters are intended to rotate while the engine is running?

If so, are new lifters crowned slightly and the cam lobes tapered slightly to encourage this rotation?

Are Model T engines designed with an offset between lifter bore and cam lobes?

The following diagram from Crane Cams suggests offset bore and lobe are required for lifters to rotate.

Thank you.

[Scott_Conger]

T lifters will do what they will do

My opinion is that no one is selling a lifter which is useable out of the box. They all need to be butt-ground before being put into service.

Herm Konkhe was a huge proponent of it and can be found here: https://mtfca.com/phpBB3/viewtopic.php?t=1081

[Kerry]

By design at that time, I say no but the lifters do rotate some but only because nothing is completely machined to "0"