I need some trying to get an horsepower est. on my new motor. Here are most of the specs I remember

 

Do they make a Weiand Stealth intake that'll bolt onto vortecs? I've never seen one.

here's what i got using assumed 10:1 compression and shorty headers (not sure about your exhaust);

peak hp = 358 @ 5500rpm (still making 358hp @ 6000rpm)
peak tq = 361 @ 4500rpm

 

Hey man, what exactly did you use to come up with those figures, im in terested in finding out my tq and hp also and there arnt many dynos around here
I have a very similar setup as the guy that started the thread just a bigger carb, cam, and some other things so it should be interesting

 

thats crazy I would have thought over 400 horsepower. And your right there not vortecs there a dart iron head dont know what kind. There's a rt007 on the top of the head if that helps. And I have long tube headers

 

Denial, i'm using Dyno2000, a dyno simulator. It gives good estimations, as long as you put in accurate information. Give me your exact setup and i'll run it through and see what it predicts.


84z try to find out what exact heads you have and i'll run it through again. Even with this setup having a better intake was good for nearly 30 peak HP. That setup with an RPM air-gap intake, and long tubes with free flow exhaust is going to be atleast 400fwhp.

i'd use a different cam for a street driven car my self. Those bracket master cams are just that, track cams that work good with high stalls or standards and make ****-poor low end power.

 

Hey doom, heres all the info off the top of my head i could give to help guestamate my hp and tq


350 small block bored .30 over (only about 700 miles on it after the rebuild)
Holley 750 double pumper carb
Edelbrock intake (dont recall the specs)
HEI destributor and coil
holley fuel pump
hedman long tube headers
3" exhaust all the way from the y pipe back with a borla catback (high flow cat installed)
2500 stall
Speed pro hyperutectic pistons
speed pro plasma moly
Not sure of heads, but there was a 3 angle valve job done, they were cleaned resurfaced and had new guides installed
Speed pro hi rev lifters
speed pro pushrods speed pro double roller timing set
true roller set
hi volume oil pump
cam specs: duration at .050" 230/230 valve lift .480/.480 lobe seperation 110

Thats all i can think of for now

 

I dug up all my info hopefully this will give me some better numbers

 

Denial here's what i got for your setup. I used GM stock 416 heads with 1.94 intakes for the heads, it's the only stock GM flow numbers i have on file. It should be close to what you have give or take 15-20hp.

peak hp = 316 @ 5000rpm
peak tq = 374 @ 4000rpm (making 372 @ 3500)

 

I can't seem to find any flow data on the dart iron eagle 180's. Anyone got a link or the data?

 

what kind of data

 

try adperformance.com

 

I found the flow data of CHP, so hopefully its ok.

I used 11:1 compression, and a dual plane intake. You're probably getting a bit more peak HP due to the spacer (not sure my self), theres no option for that in dyno2000.

This is a high RPM reving mother..

peak hp = 386 @ 6000rpm
peak tq = 371 @ 4500rpm (still 371@5000)

really flat curve from 5000 to 7000

This setup would absolutely love a single-plane intake. It predicts 423hp@6500rpm with one added.

The image is with a dual-plane intake..

 

How accurate is your program ??
and im told from the guy who built my motor its about 9 to 1 compression .

 

It's about as accurate as the information you put into it. The only thing that would be more accurate is pulling the motor and putting it on an engine dyno. I always assume its give or take 10-20hp either way. Adding engine accesories of course will lower hp, and air temp's and density will also change hp readings too. So it's about as accurate of guess as you'll get.

The only way your making 9:1 compression with those dome pistons and 64cc heads is if you got a .5 inch thick head gasket, which is impossible as far as i know. my 11:1 estimate was probably even generously low. Someone correct me if i'm wrong here..

 

Hey doom could you do one on the motor i'm building?
98 L31 5.7 .030 over 9.4:1 cr
stock bottom end rebuilt, with new pistons
GM 330 hp/350HO Cam .435/.460 lift duration @.050 212/222
Vortec Heads 1.5 rockers
Edelbrock RPM Air-gap intake
350HO Demon carb (belive its a 650)
Shorty headers, into 3" exhaust to a Magnaflow muffler

 

while you're at it, if you have time.

355- falt top hyper pistons, compression, stock with 64cc heads?
sdpc modified vortec heads-
SDPC Part Number: SD8060RA2
Manufacturer: Scoggin Dickey Parts Center
Cylinder Head Material : Cast Iron
Assembled or Bare : Assembled
Intake Runner Volume (cc) : 170
Combustion Chamber Volume (cc) : 64
Intake Valve Diameter (in.) : 1.94
Exhaust Valve Diameter (in) : 1.50

lt4 hotcam-
LT4 HOT Cam, 218 / 228 Duration@ 0.050, Hydraulic Roller Camshaft with lt4 1.6 alum. roller rockers .525 lift

holley stealthram with 58mm tb and 24lb svo injectors

slp 1 3/4" non air headers with no cat 3" exhaust

rearend is stock 3.27 9 bolt

 

ML258-89 IROC: I have an almost identical setup except I'm running a zz4 cam instead of lt4 hotcam. My crankshaft hp from an engine dyno was 390hp, have not done one at the wheels, but would guess around 330 rwhp. If I remember correctly CHP did a lt4 hot cam swap on a zz4 crate motor and added about 15hp. So maybe your pushing over 400hp at the crank, hope this helps.

 

thanks for the help! I was shooting for 350-400 hp so that sounds like i was right. I only have about 200 miles on motor and have not really got on it yet but i can't wait.