800hp ????
In my opinion, if you want a legit 800 hp, you will need 13:1+ compression, solid roller cam and possibly a sheetmetal intake (to make 2 hp/cu in). We had a 402 make 800 with those parameters.
A little bigger engine with a cast intake should get you there also. (to make 1.8-1.9hp/cu in)
A little bigger engine with a cast intake should get you there also. (to make 1.8-1.9hp/cu in)
In my opinion, if you want a legit 800 hp, you will need 13:1+ compression, solid roller cam and possibly a sheetmetal intake (to make 2 hp/cu in). We had a 402 make 800 with those parameters.
A little bigger engine with a cast intake should get you there also. (to make 1.8-1.9hp/cu in)
A little bigger engine with a cast intake should get you there also. (to make 1.8-1.9hp/cu in)
That's a stout engine at 1.8 per cid.
TECH Apprentice
Joined: Oct 2007
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From: Granada Hills, Ca
I think Cary's new Cast intake would be enough to make 800+ n/a. that is a badass manifold with a lot of runner length. If I can't be happy with my super victor, I am switching to Cary's manifold as soon as the cathedral one is ready
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Joined: Oct 2007
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From: Granada Hills, Ca
I did my homework, put together a good combo of parts and was rewarded with some good numbers on a widely used and well known dyno. Saying I got those numbers because it was a "happy dyno" is a load of crap.
To the OP, it isn't cheap to get this sort of performance. However, you're not going to need a sheet metal intake, a solid roller or run race gas. You're going to need around 400 cfm of air flow in the runners and enough displacement to keep the port velocity up. Focus on the basics which are reducing friction, reducing drag (use elec. water pump, use two ring pistons from Wiseco, roller tip rockers, etc.) and keeping your airflow (in and out) fast and free.
Talk to a good builder when you need help, but don't get sold on the extras that aren't needed.
Last edited by toneloc60; Oct 18, 2008 at 12:34 PM.
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Joined: Oct 2007
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From: Granada Hills, Ca
Hey tone,
I wasn't trying to take anything away from what you have and it is a 440 in engine, it just seemed a little high. I truly am hoping it isn't because of the combo I am building.
It did say the dyno run was corrected, so they may have had the dyno set at optimal conditions, even still 740hp is a an awesome number, congrats. That car should haul some serious ***.
I wasn't trying to take anything away from what you have and it is a 440 in engine, it just seemed a little high. I truly am hoping it isn't because of the combo I am building.
It did say the dyno run was corrected, so they may have had the dyno set at optimal conditions, even still 740hp is a an awesome number, congrats. That car should haul some serious ***.
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Verdad Gallardo I think a 454 with 12 to1 and a good set of heads like a set of ported LS7's from Texas should get me close to my 800HP goal. I can't wait for PRI to see if there is any New and better parts for the LS series that can help me with my 800HP goal.
Hey toneloc60 thanks for the insight.
Hey toneloc60 thanks for the insight. 
I think a 454 with 12 to1 and a good set of heads like a set of ported LS7's from Texas should get me close to my 800HP goal. I can't wait for PRI to see if there is any New and better parts for the LS series that can help me with my 800HP goal. Hey toneloc60 thanks for the insight.
Hey toneloc60 thanks for the insight.That's about enough for 700. you're gonna need a whole lot more for 800.
Hey tone,
I wasn't trying to take anything away from what you have and it is a 440 in engine, it just seemed a little high. I truly am hoping it isn't because of the combo I am building.
It did say the dyno run was corrected, so they may have had the dyno set at optimal conditions, even still 740hp is a an awesome number, congrats. That car should haul some serious ***.
I wasn't trying to take anything away from what you have and it is a 440 in engine, it just seemed a little high. I truly am hoping it isn't because of the combo I am building.
It did say the dyno run was corrected, so they may have had the dyno set at optimal conditions, even still 740hp is a an awesome number, congrats. That car should haul some serious ***.
it will tell you what rpm your engine will move a pre determined amount of air to relistically make 800hp on 11.0 compression you would need a sr setup and at least a 440 a set of 400cfm heads with good low lift numbers too and spin it 8100rpm compression is the only factor not air related that can increase power so the more compression the less rpm to make the power. This chart is accurate to within 2% I have used it in over 100 comparisons to dyno engines and I also have a 778hp 451lsx too that peaks at 7700rpm
Last edited by 3timeracin; Oct 31, 2008 at 09:41 PM. Reason: hyper link was wrong
I should have some numbers in a few weeks on a 427", 13.0:1 C/R, LSW ALL PRO heads, GM LSX carb intake, Wilson Elbow and a 95mm T/B. Cam= 254/259 @ .050, .676/.684 No, it won't be a pump gas motor but you're not gonna get 800 N/A HP on 91 octane pump gas anyway... I don't care if it's a LS 454, your not gonna get 800 N/A HP on 91 octane pump gas. If someone has done it, I want to see the "engine dyno sheet." RWHP numbers don't mean squat! I'll take a time slip over a RWHP number any day!
JMHO
JMHO
TECH Resident
Joined: Jun 2007
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800 hp is 800 hp-its not has easy as talking about it on the internet-
comp ratio and fuel would be my biggest concern-( u can get parts or u can make them)
and if someone can build it for say for example like 20k-just double that number-
its always the case-
what i have learnt in this feild-
the hp per cube determines how much maintence the think will need- these 1.6-2.0 hp per cube engines aint no joke-
they are hard on parts-
Thanks
comp ratio and fuel would be my biggest concern-( u can get parts or u can make them)
and if someone can build it for say for example like 20k-just double that number-
its always the case-
what i have learnt in this feild-
the hp per cube determines how much maintence the think will need- these 1.6-2.0 hp per cube engines aint no joke-
they are hard on parts-
Thanks
Last edited by njc.corp; Nov 1, 2008 at 04:53 AM.
800 hp is 800 hp-its not has easy as talking about it on the internet-
comp ratio and fuel would be my biggest concern-( u can get parts or u can make them)
and if someone can build it for say for example like 20k-just double that number-
its always the case-
what i have learnt is this feild-
the hp per cube determines how much maintence the think will need- these 1.6-2.0 hp per cube engines aint no joke-
Thanks
comp ratio and fuel would be my biggest concern-( u can get parts or u can make them)
and if someone can build it for say for example like 20k-just double that number-
its always the case-
what i have learnt is this feild-
the hp per cube determines how much maintence the think will need- these 1.6-2.0 hp per cube engines aint no joke-
Thanks
This one just did and it's a mild street build.
https://ls1tech.com/forums/generatio...rhs-460-a.html
https://ls1tech.com/forums/generatio...rhs-460-a.html
This one just did and it's a mild street build.
https://ls1tech.com/forums/generatio...rhs-460-a.html
https://ls1tech.com/forums/generatio...rhs-460-a.html
Holy old thread, btw!!!!
On The Tree
Joined: Dec 2010
Posts: 169
Likes: 1
This one just did and it's a mild street build.
https://ls1tech.com/forums/generatio...rhs-460-a.html
https://ls1tech.com/forums/generatio...rhs-460-a.html
TECH Enthusiast
Joined: May 2008
Posts: 537
Likes: 1
Is this engine going into the 90 Firebird? If so, probably a lot less money to get 800 hp from a BBC - easy fit in that car. You could probably build one with an aluminum block for what the LS engine is going to cost.
Getting 800 from LS is going to take a good selection of high end parts. Getting 800 hp from 540 or more cubic inches is just a lot easier.
Getting 800 from LS is going to take a good selection of high end parts. Getting 800 hp from 540 or more cubic inches is just a lot easier.
BES Engines has a 434 that makes 713hp on pump gas. 11.3 to 1, PI LS7 heads, LS7 block, solid roller cam, single plane, single carb. Nothing too fancy and did this last year I believe.