I want a built engine got 14K
Well there are plenty of LS7 ported intake and heads making 590-615 at the rear wheels without a huge cam so I see no problems adding a few more cubes and making 20-30 rear wheel hp. You want the proof well go check some of the 427 LS7 stuff that are breaking 600 rear wheel hp. Alot of this has to do with tuning and setup greg I have a feeling something wasnt right in your setup as my stock L92 headed and stock L76 427 made over 500 at the wheels with a small cam. Since i just changed i can tell without a doubt that the new LS7 heads and intake are MUCH faster and stronger than the old setup
No.... he used a 4.060 bore on a 6.0 block..... with a 4.00 crank. Nitrous is not good on that block with that bore unless it is a smaller shot. As far as FI..... that just depends on the pistons and heads. In his case he is over 11.7:1 so I wouldnt put boost to that setup.
As long as you have enough cylinder head the two will make similar power reguardless of design but the bigger LS7 can run a smaller cam on intake side. It's just the combination that will be different. If you're spinning an XXX size motor to XXX rpm then it will usually make about the same XXX hp as long as the heads and intake can keep up. If you get big enough or high enough in rpm then the larger head will outperform the smaller assuming they are both good designs. The good cathedral ports are really good basically so they will still fill up even these pretty big engines at hydraulic roller rpm ranges very well.
Erik, assuming that the block, pistons, rings, and rods/bearings are all capable with proper balance.... what other components do you recommend to achieve 7300-7500rpm shifts in a iron 6.0 w/ 4 inch stroke?? Just curious.
Wow... What an explosive thread... Hopefully we can help out a bit with a good comparison we had a few months back.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
None. The cam and heads and valvetrain and intake will determine the powerband more than anything.
Banned
Joined: Oct 2007
Posts: 158
Likes: 0
Wow... What an explosive thread... Hopefully we can help out a bit with a good comparison we had a few months back.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
Ron would this be one of the builds you are talking about?
D.J.
https://ls1tech.com/forums/showthrea...022&highlight=
D.J.
https://ls1tech.com/forums/showthrea...022&highlight=
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Wow... What an explosive thread... Hopefully we can help out a bit with a good comparison we had a few months back.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
The graph below represents two different Z06s
The red Line is a 440 LS7 shortblock with TFS 235cc Cylinder Heads/Vengeance cam(260s duration/under.600 lift)/Ported FAST 90mm Intake/LS2 90mm TB/VaraRam Induction/ Stock MAF
The Blue Line is a 449 built by another shop with a MUCH larger camshaft(270s duration/over .700 lift)/ET LS7 heads/Sheetmetal Intake/Speed Density Tuning
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
Everyone is so quick to jump on this LS7 stuff. It is a great design, but the cathedral port stuff has had YEARS of development and can hold its own quite well.
Our price for a complete longblock LS7 440 is $12,295.00 We have built 3 in the past 6 months that have all made 600/550 on pump gas with excellent street manners.
Thanks for the clear and concise info Ron...was refreshing after wading through all the other posts.
Can't see the graph at work, but I'll check it out at home. Sounds like great results as usual.
Keep up the good work!
Thanks!
Our 440 produced 8 less rwhp with 9 less cubic inches. If you do the math with traditional 1.5 horsepower/cubic inch our 440 would have made 617rwhp if it were a 449. Also notice the difference in power under the curve. The 449 is 50ftlbs off under the curve at certain points.
.
.
It made 1.37 rwhp/ci.
Just saying...
That is what I was asking........ So I assume Hollow or Titanium Light Valves (instead of stainless), Extreme Springs, and a cam that is somewhat peaky with a single plane setup.... and nice set of CTS-V lifters, good oil pressure, and some sorta aftermarket timing chain with a 8 inch converter should do the trick to get 7300-7500rpm? Will the stock PCM keep up with shifts that high? I assume so....
My point is... instead of worrying so darn much about cubic inch... why not builds a 408 that spins over 7300..... you will make as much power as many of the 42X/43X/44X ci motors with additional rpm, and save some money to boot. ??? Makes sense to me.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
That is what I was asking........ So I assume Hollow or Titanium Light Valves (instead of stainless), Extreme Springs, and a cam that is somewhat peaky with a single plane setup.... and nice set of CTS-V lifters, good oil pressure, and some sorta aftermarket timing chain with a 8 inch converter should do the trick to get 7300-7500rpm? Will the stock PCM keep up with shifts that high? I assume so....
My point is... instead of worrying so darn much about cubic inch... why not builds a 408 that spins over 7300..... you will make as much power as many of the 42X/43X/44X ci motors with additional rpm, and save some money to boot. ??? Makes sense to me.
My point is... instead of worrying so darn much about cubic inch... why not builds a 408 that spins over 7300..... you will make as much power as many of the 42X/43X/44X ci motors with additional rpm, and save some money to boot. ??? Makes sense to me.
PS: I will call you soon but I have been swamped here since returning from out of town.
That is what I was asking........ So I assume Hollow or Titanium Light Valves (instead of stainless), Extreme Springs, and a cam that is somewhat peaky with a single plane setup.... and nice set of CTS-V lifters, good oil pressure, and some sorta aftermarket timing chain with a 8 inch converter should do the trick to get 7300-7500rpm? Will the stock PCM keep up with shifts that high? I assume so....
My point is... instead of worrying so darn much about cubic inch... why not builds a 408 that spins over 7300..... you will make as much power as many of the 42X/43X/44X ci motors with additional rpm, and save some money to boot. ??? Makes sense to me.
My point is... instead of worrying so darn much about cubic inch... why not builds a 408 that spins over 7300..... you will make as much power as many of the 42X/43X/44X ci motors with additional rpm, and save some money to boot. ??? Makes sense to me.
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