what do these parts do?

[Fun_Bucket]

Ok so i don't know so i' going to ask (how else will i learn right?)
I have 3 parts listed below, and i've been looking around but i can't really find much info.
Basically, i would like to know what each part does, basically it's job within the engine, and what would be expected from fitting each of these parts. Please no comments like "why waste your money" i'm not really looking to purchase them, i would just like to learn a little about the parts, so any help would be very much appreciated.

Hydraulic roller lifters-
Crow timing chain set-
Crow performance valve springs

[levymetal]

man, i think you tried everywhere except google . first link that pops up is full of information!

i hope i'm right because i'm just interpreting what i've read .

when the engine is running, the cam pushes onto the lifters (tappets), which in turn push the pushrods, which push on something i don't know the name of to open the valves. the easiest way to demonstrate the difference between a flat tappet and a roller tappet is to look at the following image (you guess which ones which).



you need a roller cam if you want roller tappets as well.
benefits of roller cams: less wear, can run more aggressive lift etc

you also mentioned hydraulic as well. hydraulic tappets have oil contained within them, i guess the best way of describing why is so they can adjust their size. metal expands when it's hot, so solid tappets are designed with a small clearance which disappears when the engine is warm. hydraulic tappets maintain 0 valve clearance at all times (providing they are working ).

the valve springs close the valves when they have done their business. stiffer springs are beneficial when running high RPMs to reduce valve bounce/float (if the engine is moving too fast and the stock spring cannot close the valve quick enough or keep it closed properly). these are usually upgraded when you change to a bigger cam for the above reasons, and i don't think would be required for a stock motor (could even make it worse?).

the timing chain is what is used to turn the cam. it is driven by the crank. if you upgraded to stiffer valve springs like in the above example, this puts extra stress on the components that run it. the purpose of a double row timing chain is to make that link in the motor stronger so it doesn't fail under load. if your timing chain snaps you can do serious damage to the motor as some of the valves will still be open when it fails, won't close, and the pistons will crush them on their way back up. having said that, again, it's not required for a stock engine

if i'm wrong then someone tell me because i'm just learning for myself

sources:
Hydraulic-Roller Cams - Tech Article - Chevy High Performance Magazine
Camshaft Tech: Flat Tappet vs. Roller | MyRideisMe.com
Hydraulic tappet - Wikipedia, the free encyclopedia
Valve float - Wikipedia, the free encyclopedia
rollmaster double row timing chain... - Aussie V8 | Holden - Ford | Australian V8 Engine Community