TrimDrip

I am not saying it wouldn't be optimal. Your motor would just have to run less timing. You could run 11:5:1 if you wanted to but, you would have to run less timing than you are now.

it is the same theory of a blower putting heat in the chamber. If the charge is cooled through an aluminum intercooler, the motor can handle more boost without detonation. A motor can handle more compression with aluminum because it is running cooler.

On the other had if you have say to identical heads except, one is iron and the other is aluminum, the iron head would out perform the aluminum head at the same compression ratio. Not by much but, it would. I know a guy that paints his motors black because, he thinks that since black is absorbing heat his motor will run faster. It wouldn't be enough to notice I don't think but, he is probably right.

FivePointOhh

apples to oranges...

minnow81469

Wow man i think thats bs run in the 12's off of ported e7 heads and cam package for only like 700 bucks thats nuts id like to see im going to buy that package just to see how they put out

TrimDrip

I am guessing without reading the article that they didn't mention what compression the motor has.

minnow81469

dude compression has nothing to do with it stock compression is 8:1 and you wont gain more out of switching heads you will only gain out of switching the bottom end

TrimDrip

like i said, i bet they didn't brag about it being on a stock short block
and I know they couldn't mill the heads to much or a bigger cam that would be the limit of a stock motor would ruin the valves they put in those heads.

minnow81469

I bet they did your raving about the bottom end of the kit

ctgreddy

huh? so a motor with 10.5:1 cr will run just as quick as a 8:1 cr? cause i sure think not. And i'm not for sure but i know 5.0's have more than 8:1 compression.

minnow81469

Nope 8:1 in the 95 gt and thats not what i was saying it came out wrong my bad what i was saying is a set of heads wont turn a 8:1 into say 10:1

TrimDrip

put and old windsor head on with about a 69cc combustion chamber you might get that.
The motor in my car is 9:1 or something close to that.