kno that tha reason that tha 04 v-6 is a 3.9 cuz of tha intake so if i use 3.8l performance parts am i lossing performance n if i use tha 3.9l parts is it gona be tha same... i would juss bye tha 3.9l parts but there hard to find

ps. if anyone knos a place where i can find 3.9l parts let me kno

 

I was under the impression that the difference between the 3.8 and the 3.9 is the stroke. I thought everything else was the same. Damn you, now I have to go Googleing! [sm=smiley36.gif]

 

The reason the 04 v6 has a 3.9L is because it shared the engine with the new ford minivan, and the minivan got a restyle and went to a 3.9. There is virtually no performance gain, and using 3.8L parts should be no problem. You might want to call before you try a headswap etc but everything else should be exactly the same.

 

Its the SAME ENGINE just like 2000gt4.6 said except its stroked out a little bit. You can use the same parts on the regular 3.8l mustangs because their not gonna make special parts for a 3.9l mustang.

 

ight thanx guys.. and it is tha stroke.. my bad

 

I hope this isn't stupid and I'm don't want to hyjack this thread but. I have an 04 v6 and the sticker says its a 3.8L. What gives?

 

its because they replaced the engine half way through the year.. if yours was made earlyer durring 04 its a 3.8l.... if it was made later its a 3.9l

 

Just for information, the bores of the 3.8 and 3.9 are the same at 3.81". The strokes are different. 3.8 is 3.39" stroke, while the 3.9 is 3.46".

The additional stroke of the 3.9 means that it's displacement calculates out to be 236.68 cid or 3.88005 litres. The 3.8 is 231.8947 cid or 3.801 litres.

 

lol good research!

 

and all that means..... sorry i know most of my car stuff but u lost me... wut is tha differance in displacement gona do