Are LTx's worth it?
Staging Lane
Joined: May 2006
Posts: 88
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Hate to break it to you, but just about every Chevy magazine I have picked up has had an 8 or 9 second LT1 in it. It is very possible. No doubt the LS1 is better, but it does not make the LT1 a lame duck. It has nothing to do with sticking your head in the sand, but rather just looking at the world around us. It is very possible, and quite a few have done it. Take a look at some back issues of Chevy and performance magazines, and you will find more than 5.
I need some of the crack your smoking.....GIVE EXAMPLES!!
Just because the "magazine" you picked up has an LT1 BODIED car in it...for sure does not mean it has an LT1 in the engine compartment!
There are MANY LT1 "BODIED" cars in the 8's and even 7's.
And it "SHOULD" run 8's and ACTUALLY running 8's are 2 VERY different things.
EDIT I take that back, there IS a twin turbo purple T/A from Thunder than runs in the 8's...so thats THREE I have heard of.
David
Last edited by FASTFATBOY; Feb 26, 2008 at 11:14 AM.
how do you figure? Iron LT1 heads are proven to be a better design as far as flow goes. Being made of iron limits the compression ratio you can use because of heat soak. Make them in aluminum and youre going to have a better head than a stocker, ported or not.
And why do Impala guys chunk them in favor of aluminum castings?
David
Last edited by FASTFATBOY; Feb 26, 2008 at 11:15 AM.
The iron head is the better design (its actually a reverse cooled version of the vortec head)... but its iron!
Staging Lane
Joined: May 2006
Posts: 88
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This is news to me. I wasn't aware the the LT1 heads flow better than the aluminum heads. I thought Iron heads were easier to get more HP out WHEN they are ported. I don't think there is a design difference between the two, just material.
http://www.malcams.com/legacy/misc/headflow.htm
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Verdad Gallardo Staging Lane
Joined: May 2006
Posts: 88
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there is approximately a 9% difference in flow. like i said, they are reverse-cooled versions of the vortec heads used on 96-98 gm trucks, which are some of the best flowing sbc heads ever made.
http://www.malcams.com/legacy/misc/headflow.htm
http://www.malcams.com/legacy/misc/headflow.htm
So why are people not trying to swap Impalls LT1 heads on there cars? Is it the weight difference?
David
Staging Lane
Joined: May 2006
Posts: 88
Likes: 0
Also, from that link you posted, it looks like there is very little difference between them, not 9% better flow, more like less than 3%. It also shows that ported aluminum heads flow significantly more than the Iron heads.
Purchasing a head like you described is almost not worth it, might as well port the stockers.
Purchasing a head like you described is almost not worth it, might as well port the stockers.
There is a difference in compression ratios you can use, do some searching on this topic please. Im not an expert on it, but ive read this stuff many times more than once. Also, from that link you posted, it looks like there is very little difference between them, not 9% better flow, more like less than 3%. It also shows that ported aluminum heads flow significantly more than the Iron heads.
Purchasing a head like you described is almost not worth it, might as well port the stockers.
Purchasing a head like you described is almost not worth it, might as well port the stockers.
The 9% figure is what Injuneer calculated. (225 CFM cs 206 CFM) I didnt come up with that myself... i just trusted the guy with 30k posts in LT1 tech on cz28
Last edited by JoeliusZ28; Feb 26, 2008 at 11:34 AM.
Staging Lane
Joined: May 2006
Posts: 88
Likes: 0
weight difference and iron requires less compression ratio. They end up about even.
because we all drive stock eliminator cars here There is a difference in compression ratios you can use, do some searching on this topic please. Im not an expert on it, but ive read this stuff many times more than once.
because we all drive stock eliminator cars here
There is a difference in compression ratios you can use, do some searching on this topic please. Im not an expert on it, but ive read this stuff many times more than once. most people probably wouldnt?
I dont expect it to ever happen for that reason. I was merely illustrating that our engines have more potential we have not tapped yet. Everyone loves the LS1 because they have better heads... and we know for a fact that better LT1 heads COULD exist if someone made them.
that is all i am saying.
I dont expect it to ever happen for that reason. I was merely illustrating that our engines have more potential we have not tapped yet. Everyone loves the LS1 because they have better heads... and we know for a fact that better LT1 heads COULD exist if someone made them.
that is all i am saying.
pretty sure i didnt.
in terms of flow:
stock iron > stock aluminum
ported iron > ported aluminum
Since its only a 9% difference at most, its pretty obvious that
ported aluminum > stock iron
in terms of flow:
stock iron > stock aluminum
ported iron > ported aluminum
Since its only a 9% difference at most, its pretty obvious that
ported aluminum > stock iron
Staging Lane
Joined: May 2006
Posts: 88
Likes: 0
most people probably wouldnt?
I dont expect it to ever happen for that reason. I was merely illustrating that our engines have more potential we have not tapped yet. Everyone loves the LS1 because they have better heads... and we know for a fact that better LT1 heads COULD exist if someone made them.
that is all i am saying.
I dont expect it to ever happen for that reason. I was merely illustrating that our engines have more potential we have not tapped yet. Everyone loves the LS1 because they have better heads... and we know for a fact that better LT1 heads COULD exist if someone made them.
that is all i am saying.