gvx

I have a customer that is Hell bent on me building an 800 flywheel HP all motor 434 gen II SBC.

I would like to be able to offer him an alternative option with an LS powe-plant with the Gen II we are pushing $16.000.00. My thought is What can be done with modern LS technology for the same monies.

I would like a bottom end durability cushion built in for possibilities of a 250 shot of spray

Perimeters are an aftermarket block (unless A factory block is more desirable), single carburetor, under 3500 rpm stall, and going in a 3300 lb G-Body

Violence.z06

iTrader: (3)

800hp flywheel spray included?

lil john

Go to my last post use it as a reference I want 800 fwhp also NASCAR engine replica. Doing my own cam this time not that people like Pat G or Martin aren't the best, but I want too understand what goes into creating a cam and spec'ing it Myself.
I'll give Brad or Matt @ Comp Cams a call tomorrow.

lil john

I have some proven 800fwhp SBC builds in my files also.

gvx

All motor means Without Boost or Spray so 800hp without spray. I just want the durability built in the bottom end for the potential of additional spray.

Are your files posted in this forum somewhere?

Also Lil John I'm leaning against a short sroke 8000+ rpm engine. To keep the power-band starting under 3500 rpm I think I will need longer stroke for a broad torque curve and the Hp curve to start climbing before 4200 rpm and to peaking in the 6500 rpm range.

lil john

Well a 454 Ls short block Ls7 heads and a cam with some nice lift could do it around 7200-7500 rpm. My 408 to get 800fwhp will need to be around 8 to 8200 to ensure I get the number I would like to see and hear. But 6500 rpm,you would need High compression and a cam with a Lot of lift.

There in my hard drive: there previous mag and engine builds on this site and others such as Yellow Bullet along with many other site builds. I use them as a Reference for builds or when helping others to get a ball park figure..

John B

iTrader: (10)

You know my recipe!

Violence.z06

iTrader: (3)

you put down 800hp on that setup?

lil john

This is a quick one switch the heads and cam and use a Carb style intake. 800 HP easy with out going past 7500 rpm.

https://ls1tech.com/forums/generatio...ker-ready.html

I have every great engine build from this site:-)

lil john

Yeah John B. I think I've looked over your records more than any other engine ever. Most don't know that I based my complete setup after yours with little brother parts such as Ls3 vs Ls7 heads so on and so on, ya'll get the point.


John B put down over 700rwhp.

Violence.z06

iTrader: (3)

https://ls1tech.com/forums/carburete...ls3-build.html

lil john

Yea I've spoken to him also. One of the person's who convinced me of going with the Super Vic style intake vs my Vic Jr. That particular build is one of the reasons for shooting for 800fwhp + the fact is I only like NASCAR (I Alway Wanted there old Hp numbers)because of the engines being used 800hp with simple parts it's the Blue-Print that most get lost on.

Violence.z06

iTrader: (3)

i posted that for OP. not for you.

lil john

He stated that no High Rpm engine was wanted did you read that.

KCS

iTrader: (20)

800hp @ 6500RPM is going to require almost 650ft-lbs of torque! Thats a tall order for any small block. That means you pretty much have to use a tall deck block to get as much displacement as possible without sacrificing the piston strength.

LME did a 502ci RHS build a while back and made over 700hp with a FAST manifold. SAM did the same thing, but with a different block and OEM LS7 heads and intake manifold. Both were pump gas hydraulic roller combos.

Is a solid roller or race gas out of the question?

NAVYBLUE210

LSX IRON BLOCK W/434 CI (4.155 Bore X 4.0 Stroke)
with strength in bore for 250+ N2O
12.5:1 Comp
400+ CFM @ .600 AND STILL CLIMBING TO .700+
(maybe TFS LS7 heads worked by Chris Frank or
Tony Mamo) starts with a relatively small port 260CC compared to
Most of the others.
CAMMOTION Low Lash Solid Roller needs to Peak~ 7500 RPM
To reach 800 FWHP IMHO something like
~250/264 .680"/.660, LSA (determined by someone above my
Pay grade) LOL!
Just my .02

gvx

Thanks his is kinds the direction I am aiming for. This is similar to the cam grind with pump gas probably 108ish LSA for 12.5-1 to bleed off cylinder pressure and lower the dynamic comp or as high as 112 or more for lower cyl comp ratio I think I would need. In a genII this is what would be needed to make near the 800 hp #. Not surprisingly most of my machine shops and vendors treat LS stuff as taboo. When it comes to a genII 434 combo I can do a bullet proof bottom end w/Callies and Oliver in the $6-7000.00 range. What are some vendors and what can I expect to budget for an LSX bottom end or is an aftermarket block more appropriate? or how about the Hybrid genII LS head block? Qoting from a previous post "I would run the World block that uses the SBC bottom end, and uses the LS heads and all. best of both worlds." This would be a consideration But I haven't found any of my common vendors. The only block I have found is a non Y configuration block with the mains protruding below the frame rails?

Dart LS Next Cast Iron Block part# DRT31837211

Dart LS Next Cast Iron Block
4.125" Bore, Std. Deck (9.240")
http://www.competitionproducts.com/D.../#.VPOAg-FWIf8

Violence.z06

iTrader: (3)

http://www.theengineshop.com/product...ron-block.html


That was my post. The dart next uses ls crankshaft.the world block does not. Above it the block i was reffering to.

gvx

Whats a good head intake combo for a 4.155 Bore X 4.0 Stroke combo for under the 7000 rpm high HP goal. I am open to a higher rpm range with regards that I want it to launch under 3500 rpm. even tho I anticipate that this wide of a power-band will be difficult to achieve at this horsepower level

D9HP

Heads:
Banshee or RHS heads by Chris Frank
Mast 285cc or Mast 305cc

Intake:
Fast 102mm
Holley Mid-rise

Going to 7.5k RPM seems like the only way you'll hit that goal based on my experience. I am building a 7.5k RPM 454ci all-motor setup but mine is solid roller with zero regard to street manners.

Still haven't nailed down intake or heads.

Good luck!