uh....the LT1 IS a SBC. Just has reverse cooled heads and a different dist./coil system.

No reason you couldnt have a standard head, standard dist. motor in a 4th gen...as long as you can get the distributor to clear the cowl.

Ryan

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ryan:
<strong>uh....the LT1 IS a SBC. Just has reverse cooled heads and a different dist./coil system.

No reason you couldnt have a standard head, standard dist. motor in a 4th gen...as long as you can get the distributor to clear the cowl.

Ryan</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It really just based on a sbc. It's reverse cooled with different journals, etc. You have to use LT1 heads, and LT1 cam in an LT1. The crank/piston/rods are a different story. It basically boils down to being more expensive to biuld and LT1 than a sbc. There have been streetable LT1 strokers making 500rwhp in these cars those as well. They are solid rollers.

 

It pisses me off when people compare $99 cams to LS1 cams and complain about prices. Find a $99 cam thats for hydraulic roller, made of billet steel and gun drilled.

Not gonna happen.

Even for an LT1 this is a $400 camshaft.

Eric

 

Hyd. roller cams from Comp for a SBC are all of $180.

Solid roller's for LT1's are $259 (hyd. are 240 or so).

<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

 

i disagree with this statement....show me some flow sheets

if i remember correctly (prove me wrong please if i am) you race prepped LS6 heads had a intake port size of close to 235cc and flowed in the 330-340cfm range

with a sbc chevy head with that big of an intake port and a 2.08/2.10 valve, it will flow just as much.

The main difference with the LSX heads are the design of the intake ports and valve angles, i believe they have better velocity than standard SBC heads[/QB][/QUOTE]

I just had my heads on a flowbench today to see what the enginebuilder thought of them and he referred to them as "kick ***". He went on to say how they flowed better than lots of sbc race heads. My heads have never been touched.

 

uh, i beleive you can get a sbc 434 stroker to make 800 hp easily where those ls1 434 stroke guys are barely breaking 600. Kinda funny

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gogogadgetcar:
<strong>i disagree with this statement....show me some flow sheets

if i remember correctly (prove me wrong please if i am) you race prepped LS6 heads had a intake port size of close to 235cc and flowed in the 330-340cfm range

with a sbc chevy head with that big of an intake port and a 2.08/2.10 valve, it will flow just as much.

The main difference with the LSX heads are the design of the intake ports and valve angles, i believe they have better velocity than standard SBC heads</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I just had my heads on a flowbench today to see what the enginebuilder thought of them and he referred to them as "kick ***". He went on to say how they flowed better than lots of sbc race heads. My heads have never been touched.[/QB][/QUOTE]

No offense, but thats nice <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Show me some PROOF. I will agree that out of the box LS1 versus an out of the box SBC head...the LS1 will win and thats because of the valve angle, its easier to flow more air with a 15* valve

Again, someone post some flow sheets

 

This is a very hard comparison to make. First off, in all fairness you really need to compare standard sbc 18 degree heads with the LS1 15 degree head. These 18 degree heads are very expensive, $2500 and up not ported. Also you must run a solid roller with these heads because you need offset lifters and rockers. Youre looking at $1000 minimum in the valvetrain not including the cam. These heads flow low 300's, but this is at high lift, like .700. The best 23 degree head I've seen is Scoggin Dickey's ported Brodix track 1's. They flowed right at 300cfm for around $2500. Again the lift is beyond a hydrolic cam. Most excelent flowing standard 23 degree heads flow between 240 and 260. My point is it would cost you $15,000 plus to build a comparable Gen 1 motor that would make around 600 HP at the crank and not be very streatable. So lets say you buy a brand new LS1 crate motor $5500, stage 2 heads $2500, cam, converter,and dyno tune lets say puts it at an even $10,000. Youve got over 500 hp at the crank that gets almost 20 mpg and doesnt need to turn 8 grand to make the power that you can drive anywhere.
Just my long $.02

 

I'll get those flow numbers printed out on friday and post them. I hope I did'nt come off as being biased totaly towards the LS1 heads I was just repeating what I was told.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ryan:
<strong>Hyd. roller cams from Comp for a SBC are all of $180.

Solid roller's for LT1's are $259 (hyd. are 240 or so).

<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Those are not billet cams, they are cast.

Try again.

Eric

 

<img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

who cares.

maybe im just not a billet kind of guy. i sure as HELL would rather save the cash and go with cast....oh well. back to BBC's for me.

 

Some of the advantages of an LS motor over a SBC are:
Lower weight
Smaller overall dimensions with accessories
Shallower valve angles (higher flow)
Symmetric port layout (balanced flow)
Lifters & pushrods are lined up in a straight line (lower friction)
1.7 ratio rockers (more lift for a given lobe)
Bigger cam diameter (lower friction and more lift available at lower cam stress)
No spark scatter (oil pump & distributor are driven by the back side of the cam on SB)
More efficient oil pump design
Lower oil pressure required (lower pumping losses)
Different firing order for smoother running

I think LS motors are without a doubt better street motors but SBC's make great Hot Rods.

Steve

<small>[ August 11, 2002, 10:42 AM: Message edited by: SNW Vette ]</small>

 

So basically, for the motor that actually comes in the Fbody, it's badass. For an all out race car there are more cost effective options.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by CW 99 Z:
<strong>This is a very hard comparison to make. First off, in all fairness you really need to compare standard sbc 18 degree heads with the LS1 15 degree head. These 18 degree heads are very expensive, $2500 and up not ported. Also you must run a solid roller with these heads because you need offset lifters and rockers. Youre looking at $1000 minimum in the valvetrain not including the cam. These heads flow low 300's, but this is at high lift, like .700. The best 23 degree head I've seen is Scoggin Dickey's ported Brodix track 1's. They flowed right at 300cfm for around $2500. Again the lift is beyond a hydrolic cam. Most excelent flowing standard 23 degree heads flow between 240 and 260. My point is it would cost you $15,000 plus to build a comparable Gen 1 motor that would make around 600 HP at the crank and not be very streatable. So lets say you buy a brand new LS1 crate motor $5500, stage 2 heads $2500, cam, converter,and dyno tune lets say puts it at an even $10,000. Youve got over 500 hp at the crank that gets almost 20 mpg and doesnt need to turn 8 grand to make the power that you can drive anywhere.
Just my long $.02</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">There are MUCH better flowing heads that a pair of hogged out of Track 1s LOL

Just even look at the Track 1X heads. If i had to do it over again, i'd use those heads. 222cc inake port, 2.10/1.60 valves, 40/60 valve spacing....300cfm with minor porting and over 320 with some major porting

Now i'll agree the LSX design head will help driveability/MPG issue...i'm just saying i dont think they have a whole lot over SBC heads except at low lift flow and that is because of the 15* valve angle

FWIW, the best 23* heads you can put on a small block chevy are any type of heavily ported raised runner 23* heads. They are usually up in the 235cc-240cc range but so are some LS6 heads after major porting too and the raised runner heads will flow in around 340cfm

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gogogadgetcar:
<strong>I'll get those flow numbers printed out on friday and post them. I hope I did'nt come off as being biased totaly towards the LS1 heads I was just repeating what I was told.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nope no problem, didn't think you are biased. I just dont think that they flow as much as many here are aluding too.

At low lift flow, they will hand a SBC head its *** but i believe that is because of the valve angle but from this, its also why driveability/MPG is so good too