Installing Cams

[240fluke]

When one is installing cams on their car is there anything else that should be/needs to be done at the same time? I heard that you should also replace shims (what shims? this is for a '95 240sx KA)? How many shims are there? Are they expensive to purchase? I am currently intending on installing these myself so i figured it is probably best to just replace the shims in there rather than chance it with the current ones being out of tolerance.

Tim '95 SE

[onboost]

shims comes in different sizes, you need to measure the clearence between the shim and the cams to buy the right one. They sell them in a pack with all sizes, or you can just get the specific size after you measure each of them.
they are not expensive at all.