What Would it takefor a 650rwhp LSX Motor>
10-14-2007, 09:50 PM
#4
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Canted Valve ETP heads and a sheet metal intake, with 11.3:1 cr and .650 lift cam.
There's your 650 RWHP with an A4 and a daily driver.
You ain't gonna do it with LS7 heads and intake and on pump gas.
Doing a 498ci would be foolish IMO, it'll be a ticking time bomb living on the edge and leave no room for a rebuild.
****Is that the banjo player from Deliverance in you avatar?****
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10-14-2007, 10:06 PM
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10-14-2007, 10:08 PM
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10-14-2007, 10:10 PM
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I'm selling my short deck LSX and waiting for the tall deck so I can have my builder to a 481ci. 650 RWHP is gonna be a breeze. I'd have a 650 RWHP 454ci LSX in my car already but I think it'll be worth the wait for the tall deck.
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10-14-2007, 11:33 PM
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I'm shooting for 650 with ported ls7 heads and intake on a 454ci lsx. Cam is going to be a monster though probably in the high .600's on the lift. There's 620's comming from a 454 already on pump gas with a mild cam... and that's with gen III technology topend. I'll be at 12.5:1 running 100. I dont see 650 through the tires being unobtainable.
10-14-2007, 11:46 PM
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I'll believe it when I see it.
You change your mind more then your underwear, lol.. and I quote
"I'm from the Lauderdale area too, I'll have a 454 TT on the road before years end. NRE will be building the entire car. It will be huge.
Of course its worth it"
That was less then two months ago, Quicken! So what's it gonna be? 454 TT, 454 high compression, big cam, or 481 tall deck lsx? haha. =p
Last edited by jermzz; 10-15-2007 at 09:12 AM.
10-15-2007, 02:07 AM
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I'll believe it when I see it.
You change your mind more then your underwear.. and I quote
"I'm from the Lauderdale area too, I'll have a 454 TT on the road before years end. NRE will be building the entire car. It will be huge.
Of course its worth it"
That was less then two months ago, Quicken!
You change your mind more then your underwear.. and I quote
"I'm from the Lauderdale area too, I'll have a 454 TT on the road before years end. NRE will be building the entire car. It will be huge.
Of course its worth it"
That was less then two months ago, Quicken!
10-15-2007, 05:17 AM
#17
I'm shooting for 650 with ported ls7 heads and intake on a 454ci lsx. Cam is going to be a monster though probably in the high .600's on the lift. There's 620's comming from a 454 already on pump gas with a mild cam... and that's with gen III technology topend. I'll be at 12.5:1 running 100. I dont see 650 through the tires being unobtainable.
The one from Vengeance was even bigger....
10-15-2007, 08:42 AM
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The key always seemed to be a smaller cam with the cathedral port gen III heads, but ls7's use the traditional rectangualr port design. I'm looking forward to seeing how big the cams will end up being on these 45x + ci engines, especially when the tall deck LSX comes out soon.
I know there's gonna be problems running cams this big. They're already having to modify the lifter trays for high lift cams. I know one already came apart from the lifter getting too high in the tray.
10-15-2007, 09:32 AM
#19
It's big for a 408, 418, and maybe even a 427 running a gen III head. I'm sure there will be bigger with the 45x + ci engines. I never saw the ACTUAL specs of the cam, but you're right I suppose, it's not exactly small being 25x / 26x. Those TSP heads are flowing high CFM at very high lifts though .650 - .700.
The key always seemed to be a smaller cam with the cathedral port gen III heads, but ls7's use the traditional rectangualr port design. I'm looking forward to seeing how big the cams will end up being on these 45x + ci engines, especially when the tall deck LSX comes out soon.
I know there's gonna be problems running cams this big. They're already having to modify the lifter trays for high lift cams. I know one already came apart from the lifter getting too high in the tray.
The key always seemed to be a smaller cam with the cathedral port gen III heads, but ls7's use the traditional rectangualr port design. I'm looking forward to seeing how big the cams will end up being on these 45x + ci engines, especially when the tall deck LSX comes out soon.
I know there's gonna be problems running cams this big. They're already having to modify the lifter trays for high lift cams. I know one already came apart from the lifter getting too high in the tray.
The thing is with the ls7 type heads, I do not believe there is much reason to go to the huge cams like the gen3 stuff. The heads move enough air that you don't need the crazy huge intake lobe to fill the chamber. I believe in the case of the ls7 heads that less may truly be more.
I know a .38 in the heart is more effective than a .44 in the leg
10-15-2007, 11:48 AM
#20
The thing is with the ls7 type heads, I do not believe there is much reason to go to the huge cams like the gen3 stuff. The heads move enough air that you don't need the crazy huge intake lobe to fill the chamber. I believe in the case of the ls7 heads that less may truly be more.
I know a .38 in the heart is more effective than a .44 in the leg
I know a .38 in the heart is more effective than a .44 in the leg
A .38 to the heart will beat a .44 to the leg, but a .44 to the head will get the job done every time! 
The other thing to consider with these new heads is the huge splits in duration in favor of the exhaust side. That's a whole new thing. With the GenIII stuff, some people split their cam grinds, but I've got a feeling that with the new GenIV stuff, EVERYONE will.