help me plan out my dream motor!

[formula]

ok guys, this is not a powerplant bashing thread, i just want help filling out my plans. here's what my plans are so far:

-500 genuine, real world rear wheel horsepower
-gorgeously well-behaved, truly streetable, and seriously durable; i'd like to see an idle no higher than 650 rpm, i'd like to be able to fill up at the pump and not worry at all about it, and i'd like to not have to rebuild it for a very long time.
-all aluminum, small block chevy based (my car came from the factory with a small block chevy so SHUT UP ABOUT THE PONCHO JUNK)
-world products motown lite block bored out to 427 spec (is that a 4.125 bore?)
-arao dominion 4 valve heads
-supercharged-- not sure how yet, im thinking procharger though
-carbureted, preferably with a demon 650 modified for blow-through work
- mcleod clutchery and such...not sure on specifics here, either.
-dry sump- gonna need some advice on putting this together, too

can you guys help me plan out the rest of the motor and its support systems, like intake, valvetrain, rotating assembly, fuel system, and all the other things and things that i mentioned not being sure about up there?

cost is absolutely no object...i'm building the balls out of this motor when i do it, because I only wanna do it one time and have it be insane from the get-go.

[Norwoodx55]

:jawdrop:
Well, with 427"s and those heads, I don't think you will need a rocket scientist to help you achieve 1.2 hp/c.i. I wish I had more knowledge for your specifics(all aluminum) I think your goals can be reached even w/o the procharger. Although you may need more than a 650. If money is of no consideration, why not EFI? Oh ya, 4.125" bore and a 4" crank will get you your 427.

[Ralph LoGrasso]

I know you said carb'd (and a 427 with the outlined parts), but if you want an all aluminum small block chevy, with an extremely streetable 500rwhp, I'd go with a stock cube LSX motor. 346ci, mild cam, stage 2 or aftermarket heads, and a procharger @ 8-9psi. You should see atleast 500rwhp, if not more -- and it will idle near stock, depending on the size of the cam, be totally reliable, and extremely efficient. Add forged internals to the shortblock to make it bulletproof, and lower the compression a tad. If it just has to be carbed, go with one of the new carberauted manifolds for the LSX. -JMHO/playing the devil's advocate.

[formula]

i pretty much want it to look as much like a boring old small block with a few off-the-shelf go-fast parts on the outside, with a blower slapped on it. as few visual clues to what it really is as possible, just like the rest of the car.

the 650 is also not definite. It'll probably start off on the car just because i'd feel terrible letting a good carb just sit around, but if it keeps me from missing my 500 mark itll get swapped out.

I have thought strongly about going LSX, but at the same time it'd be harder to camouflage as a boring old small block.

i know, im probably not gonna fool anybody with the dominion heads, anyway...

truthfully i think for some reason i just want to build a really wicked small block. maybe its crazy.

[WS6]

the 650 is too small you will need a bigger carb if your planning on that cu in and those heads.

since you want it done right use an aeromotive pump if your going to stay external and run 1/2 or 8AN lines for the fuel line. 5/16 can still be used for return. if your planning internal tank pump there are a number of choices there. aeromotive makes and internal pump i think. walbro does i know.

something you may want to consider that could save money and allow you to cammoflouge the motor more is to use a regular SBC head that has a different intake angle. think NASCAR. many companies make these such as Dart. only someone with a good eye will notice instead of the 4V heads which everyone will notice. you will have to use an intake thats specific to the heads but thats no problem.

you might want the idle to be 800 since thats more "normal". 650 is low even for a manual in stock trim.

and just to throw fuel on the LSx fire. heres a quick example. 04 Z06 which means its the LS6. bone stock with only headers, hi flow cats, and procharger stage two. 543rwhp/451ftlbs. idle at 800. drives like stock til you hit it and it reaches approx 4000 rpms then it wiggles as the tires break loose. id honestly prefer to see more torque or the torque curve to be lower in the rpm range. thats no problem though as theres the Magnacharger and the new Kenne Bell blower. they are both roots style so the torque is much lower in the rpm range and stronger.

[formula]

yeah, actually in support of the lsx idea, the ls7 pretty much is my motor. I bet with some minor boltons and a tuneable ecm those things could lay down 500 hp easy, plus theyll last forever plus theyre efficient plus theyre dry sump and all aluminum and itd probably be cheaper than the motor i want to build....

dangit.

[Ralph LoGrasso]

The LS7 will get you the dry sump, which would help greatly in that department, but you could even do something along the lines of this:

Forged 402ci LS2 Shortblock - $3,950
AFR/ ET Performance 225 Heads - $2,400
FAST/NW 90/90 - $1,180
Cam - $400
Total = $7,980 (figure around $10K with all misc. stuff, bolt ons (including headers).

That's a pretty stout setup and should make 500rwhp, or more depending on the size of the cam. I'm betting you could get the 500rwhp number, and still maintain a really decent idle.

If you want to ensure it idles like stock, go with the low compression shortblock for $500 less, and strap on the procharger. You'll probably be making much closer to 600rwhp with only 8psi or so, and a small cam. Also, if you go the Procharger route, you could save some coin and run ported 6.0L heads, rather than the AFR, ET, or Darts.

All prices and parts taken from: www.ls1speed.com

P.S. A bolt-on, cammed LS7 should be making over 500rwhp as well.

[WS6]

LG motorsports tuned an LS7 after adding their headers to it and changing the oils in the Z06 to redline. they were sitting right under 500rwhp. the car had like 70 miles on it when they did this.

[Ralph LoGrasso]

LG motorsports tuned an LS7 after adding their headers to it and changing the oils in the Z06 to redline. they were sitting right under 500rwhp. the car had like 70 miles on it when they did this.

Wasn't the air box also removed? I've heard that removing it makes a pretty significant difference.

[formula]

i think what its gonna come down to is exactly how much wow factor i really want. An ls7 would be awesome, but a 4vpc fuel injected traditional small block 427 would be pretty dang cool too.

It is possible to bolt up an lsx motor to a TKO, right?

ahhh, im sure i could get somebody to fab me up a bellhousing if worse came to worst.

[trapin]

You want help planning your dream motor?

OK...here goes.

Scrape together $30,000 and go ring Kurt Urban's doorbell. Make sure you bring a bottle of wine. Red Sangria should do. :icon_razz

Seriously though, I'm not trying to be a smart a$$. I would just go see Kurt at W2W and tell him how fast you wanna go. They'll do all the thinking for ya. I wish that was a luxury I had. On my budget I'm going to have to build my own engine.

[formula]

nah that's no fun! if I wanted to let somebody else build my car, I would have just bought a decent 4th gen instead of sinking money into a pit like a second gen.

this, like i said, is all a dream...it probably wont happen for years upon years, and even then only if everything goes right.

[WS6]

yeah i beileve LG did do something with the air box on the Z06 as well.

i also believe there is a bell housing adapter plate or something that will allow the TKO to attach to the LSx line.

your dream is pretty cool. dont give up on it but at the same time dont blow all your money on something that looks killer but your too afraid to move it. it breaks down all the time or any other number of reason that would simply make it only look cool.

also remember going fast is always looking good.

[Ralph LoGrasso]

i also believe there is a bell housing adapter plate or something that will allow the TKO to attach to the LSx line.


Yeah, I do not remember the details, but there is definitely a way to mate a TKo to an LSX. I will likely be doing this on my '68, and John Parsons has already done so on his car.