I think it’s important to understand what the system is and not what you think it is.
The standard L6 chain tensioning system is adequate for road based driving however when an engine is modified for performance a number of things are changed which mean that the existing chain tensioner system is no longer fit for purpose, for example
Take a stock road engine, as you apply load and then back off, the cam timing can move as much as several degrees +- however it doesn’t matter as valve to piston clearances are huge, the cam is very modest, the compression is safe, so the tensioner is built to cater for this (why over engineer, it costs money)
But Take a well-built performance engine, (high compression, big valves, well matched cam, triple carbies and a decent exhaust) that requires accurate stable cam timing (+- 1 degree) in order optimise compression, burn, scavenging etc. oh and stop the valves hitting the pistons, the standard tensioner cannot maintain this due to that spring loaded piston, Kameari have observed this issue in high performance engines and developed a system to correct this.........which ideally should be used in conjunction with an adjustable cam sprocket and a modified cam.
The head space can be adjusted between 0-4mm so the cam spacer is unnecessary. WHAT DOES THIS MEAN?
It means that you can alter the head thickness by between 0 and 4mm before you run out of adjustment and that cam spacers (shims) are not necessary.
I still can't see how this bit of kit negates the need for shims unless it is just referring to chain tension.
You have just answered this question
with this kit you can't adjust the cam-timing, that is still necessary by repositioning the cam
Of course you can’t it’s not for that.
or by using a special sprocket (or by using shims).
????? Shims should never be used to adjust timing; they are for people who don’t have one of these who otherwise would have a slack chain due to head skimming.
Of course there are those who will say, “well my engines never needed one” and your probably right, this mod isn’t for garage queens, or popping out for a picnic and a spot of chrome polishing, it’s for the performance modifying brigade who wish to tweak and tune their cars and ensure that there stay in tune throughout the rev/power range and that components don’t collide with each other unnecessarily.