661hp/583ft.lbs LS7
04-18-2008 | 12:26 AM
#1
Thread Starter
Teching In
Joined: Mar 2005
Posts: 34
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From: Edmonton, AB Canada
661hp/583ft.lbs LS7 A video of an LS7 we just added a custom cam to and ported the heads and intake. Running a Big Stuff 3 90mm Wilson TB and going into a '56 Belair.
661hp and 583 ft.lbs and idles like a champ.
http://www.youtube.com/watch?v=D2uTuUkNBdo
661hp and 583 ft.lbs and idles like a champ.
http://www.youtube.com/watch?v=D2uTuUkNBdo
04-18-2008 | 12:23 PM
#6
Staging Lane
Joined: Apr 2007
Posts: 80
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Well, that was close - I was already speed dialing my engine builder - wanting to know where my extra HP/TQ was - as I too figured "RWHP - Whoa.. 660?? Nice numbers.. now where the hell are mine?" heheh 
But back to the OP - looks good - any chance of a dyno chart to see the nature of the curve?
But back to the OP - looks good - any chance of a dyno chart to see the nature of the curve?
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04-23-2008 | 01:32 PM
#12
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Teching In
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From: Edmonton, AB Canada
Just messing around. 
The camshaft is 242/244 @.050 with .640 lift on a 112 lobe. The lobe profile we used is a bit different than on some others we have done and it seems to work well. We spent a reasonable amount of time on the heads, but found they are pretty nice from the factory.........but did make some nice improvements. The intake we just did some basic cleanup, but not lots there. The cam is on the larger side, but the engine still made 480 ft.lbs @2500 rpm and had 12-14 inches of vacuum at 900rpm idle.
The camshaft is 242/244 @.050 with .640 lift on a 112 lobe. The lobe profile we used is a bit different than on some others we have done and it seems to work well. We spent a reasonable amount of time on the heads, but found they are pretty nice from the factory.........but did make some nice improvements. The intake we just did some basic cleanup, but not lots there. The cam is on the larger side, but the engine still made 480 ft.lbs @2500 rpm and had 12-14 inches of vacuum at 900rpm idle.
04-29-2008 | 05:24 PM
#13
Add full exhaust, (cats, stock exhaust manifolds and muffler), accessories and air cleaner and see what you get. That's what GM does to get 505HP. Or start with the stock motor the same way and see what you get. I'm not busting on you but its not a fair comparison to true SAE 505HP.
04-29-2008 | 10:45 PM
#14
Thread Starter
Teching In
Joined: Mar 2005
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From: Edmonton, AB Canada
Add full exhaust, (cats, stock exhaust manifolds and muffler), accessories and air cleaner and see what you get. That's what GM does to get 505HP. Or start with the stock motor the same way and see what you get. I'm not busting on you but its not a fair comparison to true SAE 505HP.
The point is here we added headers, cam, ported heads and made a bunch more power. We have tested with all accesories and air fiter and made 8-10 hp less.
We chassis dyno tested a bone stock Zo6 Vette and then we did headers, custom cam similar to above, and custom tune and gained 110rwhp. So port the heads on that same car, and you'll see an easy 40hp more. That's 150 hp gain from stock........same as the above combo.
I not claiming any magic, just good solid numbers and proof positive the LS7 is an awesome engine, and can be made much more powerful with medium amounts of change.