Anyone info on the new GMPP LSX-DR heads?
11-07-2008, 03:03 AM
#41
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I spoke to the head GM engineer/designer of the LSx program for about 45 minutes at the SEMA show...we went over alot of things that he asked me to not repeat on the internet regarding the details of their LSx parts in development...but i do have some details on the DR heads I can repeat
11-07-2008, 07:32 AM
#42
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DR = Drag Race... not streetable.... i didn't see any of the info saying they were meant for street use. Select heads based on driveability for the street(IE your application), if you want big power, get a blower or n2o.
Just because they are new, doesn't mean they are better for you!
Just because they are new, doesn't mean they are better for you!
11-10-2008, 11:46 AM
#44
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The new 482 and 500ci shortblocks hitting the market could use the CFM these heads produce. 
11-10-2008, 11:57 PM
#46
I'm a little lost on that one too. Its pretty ridiculous to think that LS7 heads and All-Pro heads are capable of offering enough air for a 427ci-454ci engine. We need better flowing heads to make more and more power from these sized engines, the LS7/All-Pro stuff isn't near whats needed to feed big cube engines to their max potential.
11-11-2008, 08:03 AM
#47
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Street car Hahahaha, it's all realitive. To some a car that gets less than 10 MPG and isn't a stock shortbock doesn't qualify as a street car. I know guys who drive 700 Horsepower cars to and from work when the weather is nice.
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
11-11-2008, 11:22 AM
#48
Hahahaha, it's all realitive. To some a car that gets less than 10 MPG and isn't a stock shortbock doesn't qualify as a street car. I know guys who drive 700 Horsepower cars to and from work when the weather is nice.
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
It will be interesting to see how all these new motor combinations work, but i'm sure it'll be several years before we really start to see some huge power numbers out of street applications as cam settings get dialed in.
I'm just curious to see if all of this actually will come to light, given GM current huge loses, and if they file Chapter 11, might as well say bye bye to all the hype.
11-11-2008, 01:49 PM
#49
Hahahaha, it's all realitive. To some a car that gets less than 10 MPG and isn't a stock shortbock doesn't qualify as a street car. I know guys who drive 700 Horsepower cars to and from work when the weather is nice.
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
It's the guys who only have one car, and want it to make 800 RWHP, get 28 MPG and idle like a new caddy that are out of touch.
Really things have changed so much in the last 20 years most of the young guys are spoiled.
You really can't use much more than 500 Horsepower on the street anyway.
These heads whie designed as higher horsepower larger cubic inch LSX combinations. Really by the time you buy the custom valves and the shaft rockers they are going to be a little out of reach for a street car. There is nothing stopping you from running them if that is what works for you.
Robin
500 RWHP is not all the limit for a street car, again, it all has to do with the person driving it. My daily driver, 490 RWHP, is just about the most boring car in the world, but I've had it for years now. Tell the dozens of guys around here with 1,000+ RWHP cars that drive their cars every day and like to roll race that 500 is a limit. They will laugh. But roll racing requires big hp. From a dig on the street, 1,000+ RWHP is useless. Not from a roll.
The LSX-DR heads will be all over the streets soon enough. If they build it, they will come and they will use it on the street for daily drivers.
Last edited by LS6427; 11-11-2008 at 01:59 PM.
11-12-2008, 01:55 AM
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okay maybe i said it wrong
if it were me buying these heads-and getting the specail stuff made-i would want to race it flat out on the track-
like robin said- anything over 500-600 is just out of this world for me on the street-lets not kid our selfs-u cant lay that **** down
we said we can but if we could why do we race in a roll on fashion????
sounds great ripping the tyres but lets face it its not the name of game-
while others might be different- so thats the way i feel about this head-
these ls7 heads wether its allpro or the et stuff are more then enough for me to make good power-
if it were me buying these heads-and getting the specail stuff made-i would want to race it flat out on the track-
like robin said- anything over 500-600 is just out of this world for me on the street-lets not kid our selfs-u cant lay that **** down
we said we can but if we could why do we race in a roll on fashion????
sounds great ripping the tyres but lets face it its not the name of game-
while others might be different- so thats the way i feel about this head-
these ls7 heads wether its allpro or the et stuff are more then enough for me to make good power-
01-15-2009, 07:20 AM
#52
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Of all the things that we are waiting for I hear that we are getting close on these.
I heard that there might be some test castings floating around in several weeks. will see what I can find out.
Robin
I heard that there might be some test castings floating around in several weeks. will see what I can find out.
Robin
01-15-2009, 06:27 PM
#54
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I doubt you will be seeing alot of these on the street. For most people this head is going to be waay to much...the machining for seats and guide work then cnc work and blending etc etc...is not going to be cheap for these heads..when all said and done is going to be 10k or so complete with rockers...wild guess who knows. Isnt a C5R head roughly 1800 a piece just for bare castings?
I take it there will be castings with small ports and chambers for a head porter? Looks similar to the Glidden Victor 2 heads I mess with
I take it there will be castings with small ports and chambers for a head porter? Looks similar to the Glidden Victor 2 heads I mess with
01-15-2009, 07:51 PM
#56
I doubt you will be seeing alot of these on the street. For most people this head is going to be waay to much...the machining for seats and guide work then cnc work and blending etc etc...is not going to be cheap for these heads..when all said and done is going to be 10k or so complete with rockers...wild guess who knows. Isnt a C5R head roughly 1800 a piece just for bare castings?
I take it there will be castings with small ports and chambers for a head porter? Looks similar to the Glidden Victor 2 heads I mess with
I take it there will be castings with small ports and chambers for a head porter? Looks similar to the Glidden Victor 2 heads I mess with
but I guess I understand that.Aren't C5R heads old news anyways? There's much better flowing heads then those. Don't ported LS7's crush them?
01-15-2009, 08:26 PM
#58
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I Got the new 2009 Gm Parts Catalog today. The part # is 19166979.
Description
LSX-DR CYL HEAD
356-t6 alum. racing head
LSX-DR rectangle intake port (requires LSX-DR manifold)
LSX-DR spread port exhaust port pattern
Cast-in down-nozzle bosses
Designed for upto 2.28" intake and 1.62" exhaust valves
(4.165" min Bore)
Fully CNC ported
Machined for 1.66" valve springs
11 deg. valve angle
Min Bore is 4.125"
313cc CNC'd intake port
116cc CNC'd exhaust port
50cc CNC'd combustion chambers
Capable of over 900 hp NA!
Description
LSX-DR CYL HEAD
356-t6 alum. racing head
LSX-DR rectangle intake port (requires LSX-DR manifold)
LSX-DR spread port exhaust port pattern
Cast-in down-nozzle bosses
Designed for upto 2.28" intake and 1.62" exhaust valves
(4.165" min Bore)
Fully CNC ported
Machined for 1.66" valve springs
11 deg. valve angle
Min Bore is 4.125"
313cc CNC'd intake port
116cc CNC'd exhaust port
50cc CNC'd combustion chambers
Capable of over 900 hp NA!
01-15-2009, 09:01 PM
#60
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The C5R is still one of the heads to use as far as naturally aspirated racing with ls motors, but then theres the ET canted valve head and then the new edelbrock LSR head. Throw the flow numbers out the window when it comes to cylinder heads like these. I believe the school is running the C5R in there camaro and ran what a 8.75? Not sure what honeycutt is running for heads. Dont see any LS7 heads doing that..that ive seen anyways (not saying theyre bad)
Back on topic, you'd still have to get custom valves. Im guessing its going to need a 6.250 oal valve roughly which are around 90-100 a piece (thats a shelf titanium valve). Either way im guessing 7-10k for depending on what parts being used and how much castings are? Maybe robin can give us some insight on that. Would also like to know if there will be some bare port castings..
Back on topic, you'd still have to get custom valves. Im guessing its going to need a 6.250 oal valve roughly which are around 90-100 a piece (thats a shelf titanium valve). Either way im guessing 7-10k for depending on what parts being used and how much castings are? Maybe robin can give us some insight on that. Would also like to know if there will be some bare port castings..