Has anyone seen or heard of a roller
camshaft setup on an A series?

Now that would be nice!

I've thought about it a few times
But not looked into how I'd make it actually work

http://www.myrideisme.com/Blog/camsha ... ch-flat-tappet-vs-roller/

for those interested in how they work vs flat tapped setups.
There is much to be gained in smoothness, performance and durability.

So much is adapted from Chev v8s in the past to A series, it would be
interesting if chev or holden roller setups are possible on the A.

lifter bore diameter and closeness to the cam would be the factors..

The benefits of a roller camshaft are beyond any roller rocker setup.
The camshaft suffers less stress and the amount of contact area is
beyond that occurs up top. Friction is reduced extensively.
I wonder If Peter PJZ has run into them. Will contact him.

Don't the lifters look like valves? I don't think you'd fit a roller bearing in there without boring out the hole.

Roller lifters make larger side loads and it will change the lift profile of the valve as the contact point is not always in the same place as the flat lifter. Can't remember exactly how it changes off the top of my head. I can't see it being an issue if you could fit it in.

WOFTAM...

Reason for the query is I found a 1999 VS ute with them and
the block is cracked from an accident and I could probably
get them for cheap. Might not be possible but just wondering
as Itll need a suitable camshaft and springs if its possible.

Will probably need the lifter bores sleeved or bushed but the
valve acceleration compared to a non roller cam is crazy.
less overlap, more midrange and it would spool-up snails faster.

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the lifter bores are way too small and i doubt that you could the block big enough to take a roller lifter, then you would have to work out a way to stop the lifters rotating in the bores.

good luck