Can someone tell me what a head is? Also what is a posi? I'm still learning about engines and I know the posi has something to do with rears... Thanks

 

Posi = Positraction. It's the name GM gave their LSD (Limited Slip Differential) Basically one wheel (usually the RR is the first) gets all the power until it starts to spin. Then the clutches start to engage and power it sent to both wheels.

A head is a cylinder head. It (or they) sit on top of the engine block, hence the name "head".

You can go to http://auto.howstuffworks.com/ and knock yourself out. There is a lot of fundemental info there to learn the basics from.

Good luck.

 

the cylinder head holds the valves that let in fuel and air into the cylinder, and release the spent gasses out of it into the exhaust

That how stuff works site is great. I went there to learn about air conditioning and all.

 

thanks for the link, i need to learn the basics also.