Speedyk

I have been looking into possibly building an LS motor for a certain racing class that I am interested in running, but I am not sure that it can be done, and wondered if I might be able to get some insight from this forum. The engine must be naturally aspirated, and be between 350ci to 360ci, and be an iron block. There are more rules, but we will get into those later. This motor needs to compete with motors that are using CNC ported Brodix GB2300 heads with 15.5 or 16-1 compression. The only way I have figured out so far to do an LS based engine is to buy Dart's LS Next Block and bore it out to at least 4.130, and put a 4.8 crank in it that has the 3.27 stroke. The reason I wanted to bore it out that size is to try and use the, 199-LS7285cc, head from Texas Speed, which so far is the only head I have seen the flows the numbers the GB2300 does. Is this build even possible, or am I barking up the wrong tree?

Rise of the Phoenix

iTrader: (27)

On something like this, I would talk with Chris Frank (bad *** **** head porter) and have him work you up a set of heads. In order to make that much steam, you're going to need more than a shelf set of heads. Chris Frank could get you there. I assume you'll be setting this up for a solid roller? What kind of intake/TB setup is this build limited to?

JS01

iTrader: (10)

Can be done but will need RPM and will be a higher budget build since it'll be in the 2.2-2.3hp/ci range. I would do 4.185x3.185 since Bryant makes that crank regularly maybe it wont take terribly long to get. If there are any rules on cylinder heads/intake manifold that is where you will need to spend time planning.

VLS1

www.youtube.com/watch?v=mVSnFKZmkvo

redtan

iTrader: (5)

With enough RPM and compression you can get there, especially if you bore it out to 4.185 and use some badass MAST or similar heads.

Briou

iTrader: (1)

I am shooting for around 875 fwhp with my build and it is an N/A 454ci ERL ls3 block with a set of brodix heads worked over by Chris frank, and a Kinsler intake....I am hoping to get the engine to a dyno some time in august, so I will have some results in the next month or two...check out my build thread if you want...there is a ton of good info in there...

Speedyk

There is no intake or throttle body limitations, but it can't be electronic fuel injection. More than likely it will be a kinsler or engler injection and intake setup, unless there is an intake with throttle body that would be a less expensive alternative to the kinsler or engler that would flow enough to make those numbers. Also, I have read much info out there about using (and abusing) the stock 4.8 crank. Do you think it would stand up to this? FYI this will be for 100 mile races so durability is a concern, but I didnt really think that spending $3000.00 on a crank was the feasible way for me to go.

Always2Slow

iTrader: (8)

I wouldn't be using a stock 4.8 crank for something like this.

Gray86hatch

iTrader: (83)

Buy a used nascar motor or spend close to $30k trying it with a ls

Tim

Briou

iTrader: (1)

No matter what you do to get there, 800 hp from an N/A motor isn't cheap....you're going to have to pay to get those numbers without using turbos or a sc

gnx7

iTrader: (28)

I have a billet 3.27" crank and 6.3" billet rods for sale.

JS01

iTrader: (10)

The kind of RPM you will need to be reliable at will IMO throw anything less than a CCW crank out of the picture. You will need something with .904"+ lifters for sure, and the factory style oiling system has just gone out the window also. Need something that doesnt turn at crank speed. I would say skip building a LS and move to a different platform where you can get some quality used NASCAR stuff if budget is a concern. If this was a drag race deal you could get by without most of this.

Briou

iTrader: (1)

I think he said it is a 100+ mile race....

Speedyk

I knew it wasn't going to be cheap either way to get those kinds of power numbers. I just wasn't sure if it would cost less to do the LS version versus the other platform. As far as the cost of the crank goes, Im sure the guys making this kind of power on a different platform are probably spending that amount of money on a crank. I just didn't know if it would be feasible to do it with an LS based motor at maybe a little bit less cost involved, but it doesn't sound like it matters which route I take, the amount of money will probably be about the same either way.

Briou

iTrader: (1)

Have you called Chris at Frankenstein yet? If not you really should...He has worked with NASCAR teams in the past and he is always trying to push the envelope....he is a quality dude...http://www.frankensteinracingheads.com/

99tramsamc/fia

iTrader: (2)

I can see 800 being doable on the ls.
chris franks head go like 440 cfm Ls7 brodix BR7
with the seat registers welded up and chambers welded he told me like 50cc's to get the compression up, And still have a reasonable pistons that dont have some big *** stuip big block chevy looking dome.
Rev that bitch to 9500 and let her eat. Soild roller, jesel, the right spring, olivers, dailey dry sump,all day long.
And I know where there is a 3.185 callies with undercut weights. That what they used in the daytona protype cars. They were 309's. 3.928x3.185.