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More LS1 RPM please?

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Old Nov 21, 2010 | 09:49 PM
  #41  
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What is the maximum horsepower that you are allowed to make?
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Old Nov 21, 2010 | 11:11 PM
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Originally Posted by COSTIGAN86
This is interesting... High RPM is sweet! I would like to see a reliable street-driveable (not necessarily daily driver) that can rev to 7500-8000rpm
Done easily......destroke
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Old Nov 21, 2010 | 11:19 PM
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Originally Posted by PowerShift408
What is the maximum horsepower that you are allowed to make?
345-350 depending on how heavy I keep the car. We dyno with a very specific set of rules (temp, number of pulls, hood closed..etc) we have a 9lb to 1hp limit.
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Old Nov 21, 2010 | 11:28 PM
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Originally Posted by SOMbitch
I know where you are coming from and no I have never RR but wouldn't more TQ up high eliminate some shifts as well as provide acceleration to get around other cars????
We do most of our passing under braking, in a horspower limited class there are very few acceleration passes.
Moving the powerband up is interesting, as long as it wasn't too spongy off of the bottom?
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Old Nov 21, 2010 | 11:44 PM
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Originally Posted by 01ssreda4
Done easily......destroke
Can we please not have this conversation again. Why give up power for RPMs?

Originally Posted by the22driver
345-350 depending on how heavy I keep the car. We dyno with a very specific set of rules (temp, number of pulls, hood closed..etc) we have a 9lb to 1hp limit.
You may be able to get away with an LS6 cam.
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Old Nov 22, 2010 | 06:46 AM
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Originally Posted by TurboBuick6
You need to get a cam with a high LSA but still maintain the stock lift and durations as much as possible. This should raise your power band without creating gobs of HP.
Originally Posted by PowerShift408
You may be able to get away with an LS6 cam.
I agree- an LS6 cam (204/218 .555/.551 117.5) with its high LSA is about right - it provides a torque peak just norh of 4,800 rpm; the HP peak is a little of 6,000 rpm; but importantly the HP level reamains relatively flat out to 7,000 rpm. I do think it would be nice to do that on EPS lobes for dirve train stability and reduced wear.
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Old Nov 22, 2010 | 08:25 AM
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Originally Posted by Darkman
I agree- an LS6 cam (204/218 .555/.551 117.5) with its high LSA is about right - it provides a torque peak just norh of 4,800 rpm; the HP peak is a little of 6,000 rpm; but importantly the HP level reamains relatively flat out to 7,000 rpm. I do think it would be nice to do that on EPS lobes for dirve train stability and reduced wear.
That would be nice, a buddy has an LS6 cam laying around that he isn't using.

We had a guy in our class make around 375hp with a LS6 crate motor, he had an LS1 intake and longtubes. This would be too much for our class, he de-tuned it, but I would like to avoid that. Are the heads different as well? Maybe that is where he was getting all that power?

Thanks again for all the ideas, I am really incouraged
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Old Nov 22, 2010 | 08:35 AM
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Yes, the LS6 heads (243 castings) flow more than LS1 heads (241 castings).
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Old Nov 22, 2010 | 08:40 AM
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Originally Posted by COSTIGAN86
This is interesting... High RPM is sweet! I would like to see a reliable street-driveable (not necessarily daily driver) that can rev to 7500-8000rpm
There is a guy...I think his name is Danny Popp? He has a road race C5 vette that has some monster high revving LS based motor, that thing revs to something like 8 grand? Wow that would be awesome in a track/weekend car! I am thinking pro-touring early second gen...drool!
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Old Nov 22, 2010 | 08:43 AM
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Originally Posted by Darkman
Yes, the LS6 heads (243 castings) flow more than LS1 heads (241 castings).
Ok cool, I really like the idea of the production based cam, It should be usable over a bigger RPM range.
Some guys mentioned light valves, who makes them and what are they made of? Are they durable over continued use?
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Old Nov 22, 2010 | 09:11 AM
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The 243 heads used on the LS6 come with hollow intake valves and sodium filled exhaust valves. 243 heads used on LS2s do not have these.

I do not know whether these can be used with your stock (241) heads. When you check with TSP about your motor's crank/rod setup you could ask them about light weight valve options, if any, for your existing heads.
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Old Nov 22, 2010 | 11:17 AM
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I dont think anyone has mentioned balancing the rotating assembly for rpm increase on the bottom end, just throwing it out there..
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Old Nov 22, 2010 | 05:51 PM
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Originally Posted by Darkman
The 243 heads used on the LS6 come with hollow intake valves and sodium filled exhaust valves. 243 heads used on LS2s do not have these.

I do not know whether these can be used with your stock (241) heads. When you check with TSP about your motor's crank/rod setup you could ask them about light weight valve options, if any, for your existing heads.


I have ferrea stainless 2.00 / 1.55 hollow, tuliped and undercut valves in mine, they are pretty damn light, dont remeber the #'s though..
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