The website (http://www.lyricsdownload.com/grease-soundtrack-greased-lightning-lyrics.html) has the full lyrics for the song from Grease called "Greased Lightning". I hope that is the song you are referring to. I have copied the lyrics below for you:
Why this car is automatic
It's systematic
It's hydromatic
Why it's grease lightning (Grease lightning)
We'll get some overhead lifters and some four barrel quads
oh yeah
(Keep talking whoa keep talking)
A fuel injection cutoff and chrome plated rods oh yeah
(I'll get the money I'll kill to get the money)
With a four speed on the floor they'll be waiting at the door
You know that ain't no **** we'll be getting lots of tit
In Grease Lightning
Go, go, go, go, go, go, go, go, go, go
Go grease lightning you're burning up the quarter mile
(Grease lightning go grease lightning)
Go grease lightning you're coasting through the heat lap trial
You are supreme the chicks'll cream for grease lightning
Go, go, go, go, go, go, go, go, go, go
Purple french tail lights and thirty inch fins
oh yeah
A Palomino dashboard and duel muffler twins
oh yeah
With new pistons, plugs, and shocks I can get off my rocks
You know that I ain't bragging she's a real pussy wagon
Grease lightning
Go grease lightning you're burning up the quarter mile
(Grease lightning go grease lightning)
Go grease lighting you're coasting through the heat lap trial
You are supreme the chicks'll cream for grease lightning
Go grease lightning you're burning up the quarter mile
(Grease lightning go grease lightning)
Go grease lighting you're coasting through the hit lap trial
You are supreme the chicks'll cream for grease lightning
Lightning, lightning, lightning
Lightning, lightning, lightning
Lightning