The other thing that most people dont understand about power
is that some engines can peak quickly with nothing down low
when others can reach the same peak but with more heaps fatter
graph area all the way to its peak.
Roller camshafts allow so much more valve opening and duration
without overlapping.

Roller cams started being used in factory Fords and GMs in 1985, and they made a big jump in power -- even with the emission controlled engines. They allow a much more effective profile. And I clearly remember the talk saying that Ford and GM wouldn't be able to do it correctly, as previously it required special block machining and special parts. But it's just engineering, not black magic. It really works and now most engines have them. It's not just to reduce friction (although it does that) but to get a faster cam profile.

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It is a load of work but just started
as a query to see if anyone has done it.
Would make an awesome mod.

That's a shtload of work, time and money to just get a roller cam in there.

Look forward to seeing how you go. To use the conventional tie bar or retainer you'd have to machine the web of material from between the pushrod bores, all the way down to the specified/required height.

Good Luck. pjz has a billet cam to sell.

lifter retainers are usually used to stop then rotating

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

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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WOFTAM...

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.

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.