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)

 

Cool. Least I know I'm not the only one.........
That's a stout engine at 1.8 per cid.

 

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

 

Who's making this beautiful intake manifold ?

 

see this link...

https://ls1tech.com/forums/removed-locked-thread-graveyard/967504-new-race-manifold.html

 

Okay guys, I don't know what else to tell you. Usually when someone makes a claim for XXXhp and XXXtq they get people telling them to post a dyno sheet to prove it. I did that. And you still have a hard time believing it. I don't know what else to tell ya.

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.

 

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 ***.

 

CID= number of cylinders x 0.7854 x Bore squared x Stroke
8 x 0.7854 x 17.015625 x 4.125 = 441.014371875

 

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.

 

That's about enough for 700. you're gonna need a whole lot more for 800.

 

Its actually pretty easy to know how much power you can make and where it will peak. the cubic inch determines the RPM at wich peak hp will occur. Take your cubic inch of one cylinder for a 440 its 55ci that size cylinder will move the required 375cfm of air to make 750hp at exactly 7575rpm. thats using the simple equation of 2.0hp per cfm. also there is a chart at this link http://users.erols.com/srweiss/tablehdp.htm
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

 

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

 

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

 

youre tellin me man, I came 20 horse short of 1.6

 

Has anyone reached 800hp NA on pump gas?

 

This one just did and it's a mild street build.

https://ls1tech.com/forums/generatio...rhs-460-a.html

 

Just barely though.............slouch

Holy old thread, btw!!!!

 

Yes, I've seen this great build and I forgot to say other than this one

 

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.

 

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.