As the title says, which is best, the one with a hole in the side or the one without the side hole.

I think the best ones these days are the ones with the correct hardness and radius ground into the tappet surface.

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This may help - https://russellengineering.com.au/camshaft-followers/

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Safest bet is second hand BMC ones, spherically ground by Graham Russell in Sydney or Matt Read in Brisbane.
Nitriding the reground cam helps life too.

Last time I spoke with Graham 2 weeks ago about the Kent lifters, he gave them his blessing, maybe the info in his blog above may be out of date now?

Moral of lifters story- don't bin your old ones unless chipped on the face. Get them reground.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi All
At the moment the only cam followers I would put in a motor with out grinding are the Kent Cams CF95, these
followers are all around 63 RC very hard and have the correct radius on them I haven't seen mini followers that hard for 30 years or more.
These followers are not cheap 95 pounds a set, they claim they are made in the UK but you only get what you pay for.
Graham Russell

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"It's better to be not informed than ill-informed"

Who does spherical cam followers grinding in Newcastle and what is the cost.

PM sent.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Tighe Cams in Brisbane resurface followers.

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The bitterness of poor quality (or Crappy Workmanship) remains LONG AFTER the Sweet Taste of Low Price is forgotten.