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LS3 with 243 Heads and Nitrous Building a LS3 with 243 heads. 243’s have 660’s dual valve springs and a valve job. Running a Texas Speed Torquer V4 Cam 231/234 629/615 112 LSA. Pistons are -2cc CP Forged Pistons. Texas Speed Super H Beam Rods. The crank is stock other than being balanced and polished. Nitrous is a plate kit from NX going to spray 200-250. Intake is a LS1 with a stock 78mm throttle body. The motor should be around 11.1 compression. Anyone have HP and Torque numbers from something similar. Thanks Michael |
LS3 with 243 Heands and Nitrous Building a LS3 with 243 heads. 243’s have 660’s dual valve springs and a valve job. Running a Texas Speed Torquer V4 Cam 231/234 629/615 112 LSA. Pistons are -2cc CP Forged Pistons. Texas Speed Super H Beam Rods. The crank is stock other than being balanced and polished. Nitrous is a plate kit from NX going to spray 200-250. Intake is a LS1 with a stock 78mm throttle body. The motor should be around 11.1 compression. Anyone have HP and Torque numbers from something similar. Thanks Michael |
Why would you build an LS3 with 243's? and then strangle it further with a LS1 intake? and then a 78mm TB, I'm sorry but if your trying to impress us , it's not with your intelligence. you've done about all you could to take HP away. |
Why would you build an LS3 with 243's? and then strangle it further with a LS1 intake? and then a 78mm TB, I'm sorry but if your trying to impress us , it's not with your intelligence. you've done about all you could to take HP away. |
Yeah man, you start off strong with LS3, they you are walking backwards with your mods. |
The 243’s will be there for the time being and what a LS6 intake would gain me 25 or 30 more HP over the LS1? |
Originally Posted by Novakane1963
(Post 20049433)
The 243’s will be there for the time being and what a LS6 intake would gain me 25 or 30 more HP over the LS1? |
Originally Posted by cmysix
(Post 20049421)
Why would you build an LS3 with 243's? and then strangle it further with a LS1 intake? and then a 78mm TB, I'm sorry but if your trying to impress us , it's not with your intelligence. you've done about all you could to take HP away. |
Originally Posted by Novakane1963
(Post 20049379)
Building a LS3 with 243 heads. 243’s have 660’s dual valve springs and a valve job. Running a Texas Speed Torquer V4 Cam 231/234 629/615 112 LSA. Pistons are -2cc CP Forged Pistons. Texas Speed Super H Beam Rods. The crank is stock other than being balanced and polished. Nitrous is a plate kit from NX going to spray 200-250. Intake is a LS1 with a stock 78mm throttle body. The motor should be around 11.1 compression. Anyone have HP and Torque numbers from something similar. Thanks Michael |
[QUOTE=01CamaroSSTx;20050753]Running 243's designed for a 4" bore on a 4.065 bore will work but you are restricting the engines ability to take in a big breath of air and fuel. You can make more power and torque with cylinder heads designed for that larger bore. If it where me I'd hunt for a set of LS3's and run an adapter plate to keep your cathedral stuff and run an adapter plat to switch over to a larger 4 bolt throttle body that is much larger than 78mm and that will let you use the cathedral intake. That would really help it out a bunch but to answer your question hypothetically as I'm not expert maybe 400 fwhp.[/QUOTE Thanks for the information and I’m in the process of looking for some LS3 heads. |
Still trying to figure out what eggplant head means... |
Originally Posted by Darth_V8r
(Post 20050871)
Still trying to figure out what eggplant head means... Mike. |
This build would be much better with ported 243's by AI, TEA, FED, etc if you wanted to keep stock casting and run a TBSS style 4 bolt intake to let it breathe.. That's what I've considered for my 96 c1500 build but I might just opt for ls3 top end. John Bewley told me on FB that a 6.2 with stock 243's (don't remember which intake) would make 430/430. And even that is choking the 6.2. |
Originally Posted by Novakane1963
(Post 20049379)
Building a LS3 with 243 heads. 243’s have 660’s dual valve springs and a valve job. Running a Texas Speed Torquer V4 Cam 231/234 629/615 112 LSA. Pistons are -2cc CP Forged Pistons. Texas Speed Super H Beam Rods. The crank is stock other than being balanced and polished. Nitrous is a plate kit from NX going to spray 200-250. Intake is a LS1 with a stock 78mm throttle body. The motor should be around 11.1 compression. Anyone have HP and Torque numbers from something similar. Thanks Michael Think about it, Its very close to a cammed LS2 6.0 and they are typically in the 430 NA range. |
I don't think it's worth it unless you can afford a set of cathedrals that can let it breathe. If not you essentially overpaid for what a 6.0 could do. Leaving too much on the table with the stock cathedrals. I think most "stage 2" CNC programs would work well, but for the price of new valves and everything it might work better to hop onto a set of 220's. Or just stick with the ls3's and get a cam matched for your goals |
Originally Posted by LSleeper1500
(Post 20052071)
I don't think it's worth it unless you can afford a set of cathedrals that can let it breathe. If not you essentially overpaid for what a 6.0 could do. Leaving too much on the table with the stock cathedrals. I think most "stage 2" CNC programs would work well, but for the price of new valves and everything it might work better to hop onto a set of 220's. Or just stick with the ls3's and get a cam matched for your goals |
that’s another topic for the cam guru’s.. i’d think you’d need a little more split with the rectuaglur stuff but i can’t say for sure. |
Originally Posted by Novakane1963
(Post 20052104)
So if I went with LS3 823 heads my cam I have now wouldn’t work?? |
Originally Posted by G Atsma
(Post 20052128)
It WOULD work, in that the bigger LS3 heads will gain power. It's just that LS3-type heads like a little more split in the duration to be optimum, in an ideal situation. |
Usually even a bit more. Cam Motion on their mild cams uses a 10-degree split. Their Titan series higher performance cams use an 8-degree split on the 2 mildest cams, the next hotter one uses 10 degrees, and the hottest (232/244) is 12 degrees. So there ya go. |
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