Hitting 400rwhp in an LT1
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Launching!
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From: MI
Hitting 400rwhp in an LT1 What size cam is usually required to hit 400rwhp in an LT1/LT4? I have a H/C swap coming up and want to hit 400 minimum on a stock shortblock. Anyone have dyno-graphs? Any input would be appreciated.
On The Tree
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From: Houston/ Austin, TX
Get some AFR heads, a custom cam, tuned, and boltons.
Or if you want a street beast, im thinkin about goin turbo. It sounds kinda ricer, but it will make a rediculious amount of power. Ive heard of alot of people with bone stock 5.0's runnin 9 lbs put down 450 to the wheels (obviously tuned and fuel system upgraded to handle the power).
I just wanna see what a LT1 do under turbo boost. I know it would be amazing. http://66.70.20.245/store/scripts/pr...p?idproduct=11
Or if you want a street beast, im thinkin about goin turbo. It sounds kinda ricer, but it will make a rediculious amount of power. Ive heard of alot of people with bone stock 5.0's runnin 9 lbs put down 450 to the wheels (obviously tuned and fuel system upgraded to handle the power).
I just wanna see what a LT1 do under turbo boost. I know it would be amazing. http://66.70.20.245/store/scripts/pr...p?idproduct=11
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Launching!
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From: MI
Originally Posted by kevinb
The heads will make the most difference. I know a few lt1's with TEA heads (a sponsor) and i think an off the shelf comp xe camshaft making the 400hp mark.
Last edited by Elysian; Feb 18, 2004 at 01:58 PM.
Originally Posted by Elysian
About what size, though? Comp XE 224/230 or bigger? I see LS1 guys hitting 400rwhp with a TR224 cam. With decent heads, duration on a cam should be about the same for the same power??? PS: I'm not interested in going forced induction or with NOS. Just NA.
Cams that for sure will make it: 230/236 XE, CC306, GM 847 (I REALLY like that one) immediately come to mind.
I'm trying to get there on my 224/230. Joe Prince did a killer job on my heads, but I'm working some kinks out of the car. The part that I'm waiting to put on is the 1.7 rockers. That will give me the lift to get the valve transition into the meat of the flow, right at the peak. I may, I may not. I could still put an ORP on the car since I'm running a cat, and there's a couple of other tricks up my sleeve still. We'll see. With a perfect tune I think it may be possible, but it's not the norm on a 224/230 cam.
No, the off the shelf 230/236 needs no bottom end mods. It's only a .544/.555 lift with a 1.6. And yes, you'll need the 1.6 rockers to hit the 400 with that. I'm not a big fan of that cam because you tend to sacrifice some overall torque.
The GM 847 is actually a crane grind: 234/242 @ 0.50, .575/.595 with a 1.6 rocker, 112* LSA, I forget what the intake centerline is. To put it in perspective, a guy on CZ28.com made 357 SAE RWHP with this cam on STOCK heads. There's more than a few running over 400 RWHP on marginally ported heads (260ish @ .550).
The GM 847 is actually a crane grind: 234/242 @ 0.50, .575/.595 with a 1.6 rocker, 112* LSA, I forget what the intake centerline is. To put it in perspective, a guy on CZ28.com made 357 SAE RWHP with this cam on STOCK heads. There's more than a few running over 400 RWHP on marginally ported heads (260ish @ .550).
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Launching!
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From: MI
Originally Posted by Fastbird93
No, the off the shelf 230/236 needs no bottom end mods. It's only a .544/.555 lift with a 1.6. And yes, you'll need the 1.6 rockers to hit the 400 with that. I'm not a big fan of that cam because you tend to sacrifice some overall torque.
The GM 847 is actually a crane grind: 234/242 @ 0.50, .575/.595 with a 1.6 rocker, 112* LSA, I forget what the intake centerline is. To put it in perspective, a guy on CZ28.com made 357 SAE RWHP with this cam on STOCK heads. There's more than a few running over 400 RWHP on marginally ported heads (260ish @ .550).
The GM 847 is actually a crane grind: 234/242 @ 0.50, .575/.595 with a 1.6 rocker, 112* LSA, I forget what the intake centerline is. To put it in perspective, a guy on CZ28.com made 357 SAE RWHP with this cam on STOCK heads. There's more than a few running over 400 RWHP on marginally ported heads (260ish @ .550).
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TECH Fanatic
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From: kuwait
440 rwhp LT1 stock bottom end LT1 with a home ported set of stock heads, and cam it's from TR [ThundeRracing] you can ask Paul from TR about the car.
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
Thread Starter
Launching!
Joined: Jul 2003
Posts: 204
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From: MI
Originally Posted by Fahad
440 rwhp LT1 stock bottom end LT1 with a home ported set of stock heads, and cam it's from TR [ThundeRracing] you can ask Paul from TR about the car.
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
What is the general consensus on the 233/239 Combination Motorsports cam? Anyone running it making over 400rwhp?
Thread Starter
Launching!
Joined: Jul 2003
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From: MI
Originally Posted by *High-Noon*
Easy way.........get some AFRs! I'm right there.......
Originally Posted by Fahad
440 rwhp LT1 stock bottom end LT1 with a home ported set of stock heads, and cam it's from TR [ThundeRracing] you can ask Paul from TR about the car.
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
I hope this will help you..
https://ls1tech.com/forums/showthrea...highlight=rwhp
Good luck..
Yep..thats SAR2K. I wouldn't call that cam a daily driver type of cam. Weekend toy..yep. He actually made a tad over 450 with more tuning. When he gets this sucka dialed in its gonna be a 10 sec. stock bottom end NA car.
quest for 400 rwhp...The power is in the heads.
quest for 400 rwhp...The power is in the heads.
Agreed. To a point. A well matched head and cam setup is the key. You can have a killer set of heads, but put a cam in there that just doesn't utilize the characteristics of the heads, and get nowhere. That said,
I want a custom grind.
I want a custom grind.
Thread Starter
Launching!
Joined: Jul 2003
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From: MI
I'm curious if anyone knows how drivable that 440rwhp LT1 is? I've seen that 450rwhp car as well (97 Trans Am WS6 I believe). I'm interested in a daily driver that can cruise reasonably comfortably up and down the road at ~1800-2000 rpm. I'm sure I could make 500rwhp if I put a 280 @ .5 cam in, but I don't really feel like getting kicked in the back every time the crank turns over. So obviously, I'm willing to make some trade-offs. If I can make 400 rwhp I'll be happy. More would obviously be acceptable, assuming these criteria: drivable @ 2000rpm, NA & running on pump gas.
Last edited by Elysian; Feb 20, 2004 at 10:47 AM.
If the AFR is the same "height" as the LT1 casting, you should be good to about .600. I'm not sure about the AFR casting though, but hopefully that will help to give you a starting point.
Thread Starter
Launching!
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From: MI
The AFR casting using the same hardware as an LT1 (rockers, same lenght pushrods, springs, etc). The heads I've got have 56cc chambers (which is smaller than LT1's, I believe). I don't know to what extent that affects how much lift can be run . . . ?
Ultradyne (back when it was still around) had a cam that was 230/238 .565"/.565" 112 LSA.
With good bolt-ons and strong heads, that cam will break 400 easily. NickS on FRRAX.com hit 411 rwhp with it.
But again, just because you toss a cam in doesn't mean anything if the supporting mods aren't there. Don't forget injectors either. My stock ones are pretty much maxed out on my 224/230 (thus my peak rwhp of 366). Once I bump up to 30 pounders I should be at fastbird93's power levels
With good bolt-ons and strong heads, that cam will break 400 easily. NickS on FRRAX.com hit 411 rwhp with it.
But again, just because you toss a cam in doesn't mean anything if the supporting mods aren't there. Don't forget injectors either. My stock ones are pretty much maxed out on my 224/230 (thus my peak rwhp of 366). Once I bump up to 30 pounders I should be at fastbird93's power levels