bufmatmuslepants

iTrader: (3)

i heard it can get up to 515ci, but has anyone done that yet? when i graduate in the spring with my ME degree i want to build an overkill N/A LSx to be street/strip driven in my Z28. ive seen 454 rotating assemblys, 427s, but none with 500 or bigger. id like to do the whole project for under 30 grand.

Phil99vette

iTrader: (11)

For the heads that are available for a decent cost, a 427 is probably the biggest I would build. To take advantage of the bigger displacement of the 454-500 you really need a sheetmetal intake and some canted valve heads.

LS6427

iTrader: (2)

You'd have a ticking time bomb at 500+ cid....NO?

A 454ci is a great build and you still have strength and reliability. Kickass heads and an intake and you'll make some awesome N/A power, maybe 650 RWHP or more on pump gas.

30K, you can almost build 2.

Zac_Speed

iTrader: (4)

What about a 470ci. Warhawk? With some Canted heads, and a Harrop intake. 11.5/1 cr.

Zac_Speed

iTrader: (4)

Oh yeah, SAM racing has a Camaro with a 500ci LS2. It makes like 9XXhp on pump gas.

LS6427

iTrader: (2)

Pump gas??? Are you sure? Sounds impossible.

But don;t think for a second that that rngine is anything but a one off ridiculously expensive engine just to built to run a fast 1/4 mile for advertising purposes. And it will not last long at all for what you want it for. Maybe a few days.

3timeracin

iTrader: (15)

The only advantage on the bigger 500ci is the RPM of peak HP will be lower and easier on parts I have built 2 real big engines 1 was a 460ci and another was 470ci both with PRC LS7's cnc'd heads that flow 400+ cfm and to use all the head flow you have to spin the 470ci engine 7400rpm and if you had a 408ci it would need to turn 8800rpm to make the same power and move the same 400cfm.

texas94z

Check out Pratt & Miller's C6RS. Its powered by a 500ci with stock ls7 heads and making 600/600 on pump gas. Very expensive motor to build however, but Katech is the best.

Codefive

Here is a link to that SAM engine:
http://www.samracing.com/500ciLS2.html
What they dont say in print but is obvious by the dyno info as well as the video is that its on a HUGE hit of nitrous.
Also, with a 4.500" crank and a 6.800" rod insdie of a stock deck height block, I cant image that thing has a long life expectancy. Just my opinion.

Beaflag VonRathburg

iTrader: (176)

^ That is a tall deck block. If I remember correctly it is roughly a 9.8 or 10.2 inch deck height. A 4.5 crank and 6.8 rod leaves a lot of compression height with either of those measurements.

EDIT: It is a 10.2 deck height. With a zero deck that works out to a 1.15 compression height.

stevensLS1

iTrader: (2)

If you have a budget of 30k why not build a turbo motor with a nice 6 bolt head? You'd have a damn good street strip car. Just a thought. Do you have an end goal of the car other than street/strip?

Zac_Speed

iTrader: (4)

I never once thought that SAM motor would be good for anything other than the strip, seeing how it's like a 9k RPM motor. What about this though;
Could you realisticly get a 440-470ci LS motor to make a reliable 685-700rwhp and spin it under 7500rpm? Once I get my garage built that's what I'm wanting to build.

Gen414

iTrader: (38)

That has to be a misprint...you can NOT fit a 6.80" rod inside a stock deck height block, ain't gonna happen

Gen414

iTrader: (38)

You know, thats funny you say that. I made a post a few weeks ago, and told someone to build a tall deck motor, and some idiot wanted to get into a pissing match with me because he said there was no such thing.

bufmatmuslepants

iTrader: (3)

Zac Speed pretty much hit what im looking for right on the head. i want the big cubes cuz i dont wanna spin it to the moon, and want big torque and horsepower and maybe a big shot of nitrous "just in case". i said a budget of 30gs cuz my other option is to go out and buy a brand new car, but for 30gs i could build what i want and it would smoke anything under 50gs. from the research ive done so far ill probalby go with a 454 but if a 496 or bigger was possible to do while remaining reliable that would just be cool.

StevensLS1, supercharger or turbo is an option, but a N/A greater than 454 ci engine would be freakin cool and i think make enough power to keep me happy for a little while.

that SAM engine is sick, if an LS2 can do that the LSx should be stronger right?

LS6427

iTrader: (2)

It will be very unreliable and probably drink oil at rate that would break the bank.

For a little while, until a guy with a single turbo 408ci and a near stock idle blows your doors off without breathing hard. Go for a turbo engine and make 1,200 RWHP and have great reliability with the LSX iron block and 6 bolt heads.

The SAM engine is useless for anything but the 1/4 mile. And very unreliable. Cannot be driven daily. The LSX iron block is incredibly stronger than the aluminum blocks.

bufmatmuslepants

iTrader: (3)

you make a good point, might as well do it right the first time.

stevensLS1

iTrader: (2)

Yeah exactly. there's tons of great builds going on in the FI section. The good thing is you have plenty of time to learn about whats the best option for you and really decide what you want. Yes the N/A motor would be a great accomplishment but like said about some single turbo mustang, supra etc blows your door off you will be rethinking everything and then have to start from almost scratch. Good luck with whatever you decide!!!

briannutter

There are some people here posting without bothering to do some basic research. The ERL 500 was first seen at PRI in 2005.-long before anyone elses. The ERL/SAM 500ci is a street engine..pure and simple. You can buy a turn key version of it from ERL today if you want. ERL and Jud decided a "race" version would scare potential buyers into thinking it was a exotic high maintenance piece...so a pump gas small cam wet sump version was decided for the first go. Brushed up Ls7 heads and factory LS7 manifold---doesn't get much more simple that that. low 250@.050 cam idles nice in this cube engine. Made a bit over 700 horsepower at the crank at 6300 and held power well up to 7000....Linda was holding it at 7300 at 1000 ft. mark against the limiter when her car wasn't geared for the increased Trapspeed at the first LSX shootout. Torque starts at around 600 and hits 650 ft. lbs at 3600 if I remember right. 10.200 deck in this case (but can be made at different heights easily). A boost version is available with a 6.600 rod and the street version comes with a 6.800 rod. It was sprayed with a simple NOS ring 250 shot for test purposes (making sure the head gaskets would be happy at 4.200 bore) which resulted in around 92x hp and torque. That thing was hammered on the dyno over 60 pulls before being going into Lindas car. Sleeve length and rod angle are real nice...the engine will run for a long time on the street. At some point, someone will spend the bucks on a race engine....Canted Valve heads and sheetmetal on it will make 1000hp N.A.

Beaflag VonRathburg

iTrader: (176)

^ I'm glad someone posted that. As I was reading this I was thinking parts of that the whole time.