Hey guys, I am starting to wonder what my mild 383 is pushing out.

Here's the basic combo:

-350 block 4.030" bore
-Cast pistons 9.5:1 CR
-Moly Rings
-Cast 3.75" stroker crank
-Stock 5.7" X-Rods w/ARP Bolts
-Everything Balanced
-'74 '882' iron heads w/2.02/1.6" SS valves and minor pocket porting
-Erson HYD flat tappet cam, specs with 1.5:1 rockers: .429/.429" lift, 288/288 adv dur, 214 dur@0.050", 111 LSA.
-1.6:1 Comp Magnum Roller Rockers (makes the lift around .458")
-Performer RPM Intake manifold
-Edelbrock 600cfm carb, but switching to a Holley 3310 750cfm soon
-Crane HI-6 Ignition Box, 55k volt coil
-Accel 8.8mm wires
-A/C Delco plugs gapped at .045"
-Inital timing is 8*, total 32* by 3000 RPM
-Block Hugger 1 5/8" ceramic coated headers
-Dual 2.5" exhaust with straight-through 'bullet' mufflers

If someone has time, a reading with both carbs would be great.

Thanks in advance for the help.

371HP@5500 and 390lbft@4500 using the "stock low per/pocket port/larger valves" option, with the 600cfm carb.

379@5500 and 395@4500 with the 750cfm carb.

***EDIT*** If anyone saw what I wrote about CHP's 882 flow #s, feel free to forget what I said. It was MY error that was making DD2K read the 882s as super-heads. I accidentally put in the flow numbers and said they were tested at 1 inch of H20 instead of they 25 inches that I **think** they tested them at. What's the industry standard?

Using the CHP figures....

374HP@5500 and 391TQ@4500 for 600cfm

382HP@5500 and 396TQ@4500 for 750cfm

This is with the cam set as dual purpose street/track specs @ .050. Gave the stock 882 casting 10 more cfm per lift. Small headers with open exhaust, since you have a pretty straight through exhaust. Remember DD is best for showing trends not actual numbers.

600cfm carb
RPM/HP/TQ Flywheel
2000/147/385
3000/226/396
4000/310/407
5000/367/386
6000/357/312

Peaks
371HP@5500RPM
407TQ@4000RPM

750CFM Carb
RPM/HP/TQ Flywheel
2000/147/386
3000/227/398
4000/312/410
5000/372/391
6000/364/318

Peaks:
377HP@5500RPM
410TQ@4000RPM


I agree with DD, I think your carb is too big.


EDIT: I've got a flow sheet on both 882 and vortec:

882: Intake:70/125/175/204/205
Exhaust:58/108/135/141/142

.1>.5lift

Vortec: Intake:70/139/190/227/239
Exhaust:44/95/134/159/177

EDIT: Should be about 28"h20

Mine was with cam set at Hi Perf Street with the "seat-to-seat" duration #s.

Twilight, where did you get your flow numbers for the 882s?

Magazine article a while back. Forget which, You've got mail redface.gif )

Twilight, yeah, I'm using the same #'s as CHP (like the ones you sent me), I just goofed the first time around. But I didn't mess with the actualy flow numbers, I just upped the valve size (the flow file shows stock valves, but i chose bigger valves on the engine sheet).

My bad for the mistake earlier. Oh, and the numbers drop about 13HP and 6TQ when I went from 25 inches to 28 inches.

Is 28 really the industry standard?

Oh shoot I left it as a 350.... what's your stroke? 3.75? if it is, you got a little more low end, like 5-10 horse, and about 20 lb ft


Just went to protopline's site and its at 28", same with AFR's website... so I would assume!

Yeah, I'm still only getting:

361HP/386TQ/600cfm
369HP/389TQ/750cfm

I think you're being a bit generous with the 10cfm at every lift point.....

Darn, I must be bored, disputing video-game dyno results...LOL.

I've noticed seat vs .050 timings in cams on DD can really make a difference. I put the stock 882 in and got : 369HP/436TQ with the 750cfm. That's with the .429 cam 1.5 lift. Not the 1.6s!


Just more proof to take DD with a grain of salt. Hell, it says I've got 498HP@6500RPM and 469TQ@5000RPM with my sig!~ I could dream! Assuming a 20% driveline loss thats 398HP! NO WAY! Atleast my 13.0@107 doesn't seem to agree. Heh.

With the 600:

RPM···········1500····2000····2500····3000····3500 ····4000····4500····5000····5500····6000
Brake_Tq······278·····324·····353·····372·····379· ····372·····344·····296·····240·····183
Brake_HP······79.3····123·····168·····213·····253· ····284·····295·····282·····252·····209
Exh_Pres······0.0·····.1······.2······.2······.4·· ····.5······.6······.7······.8······.8
Int_Vacuum····.3······.6······.6······.6······.6·· ····.7······.9······1.0·····1.1·····1.2
Vol_Eff_%·····63.9····70.9····77.0····81.8····85.3 ····87.3····86.5····83.2····79.1····74.6
Actual_CFM····114·····169·····230·····292·····356· ····416·····464·····496·····518·····533
Fuel_Flow·····41.7····61.7····83.9····107·····130· ····152·····170·····181·····189·····195
A/F_Mix_Qal···100.0···100.0···100.0···100.0···100.0· ··100.0···100.0···100.0···100.0···100.0
BSFC··········.526····.500····.499····.503····.515 ····.536····.575····.643····.753····.935
BSAC··········6.601···6.275···6.257···6.306···6.45 5···6.726···7.215···8.069···9.447···11.722
Friction_HP···13······22······33······46······62·· ····84······112·····145·····185·····230
Mach_#········.159····.211····.264····.317····.370 ····.423····.476····.529····.582····.634
Piston_Spd····938·····1250····1563····1875····2188 ····2500····2813····3125····3438····3750
Piston_Gs·····159·····283·····442·····637·····867· ····1133····1433····1770····2141····2548
Overlap_%VE···-1.9····-1.4····-1.1····-.9·····-.8·····-.7·····-.6·····-.5·····-.5·····-.4
Int_AvgVel····93······124·····155·····186·····217· ····248·····279·····310·····341·····372
In_InertiaPrs·.0······.3······.8······1.2·····1.6· ····1.9·····2.0·····1.9·····1.7·····1.5
In_ResTunPrs··0.0·····0.0·····.0······.0······.0·· ····0.0·····0.0·····0.0·····0.0·····0.0
Ex_AvgVel·····99······132·····165·····198·····231· ····264·····297·····330·····363·····397
ExTun_Prs·····1.6·····1.5·····1.4·····1.3·····1.3· ····1.2·····1.1·····.9······.9······.9
Lifter_Pump_UpNone····None····None····None····None ····None····None····None····None····None
Spark_Adv·····15······18······21······24······27·· ····28······29······30······31······33


With the 750 you gain about 4 peak hp.

i have 882 heads on my car, but they are pocket ported pretty heavily

using the option closest to my power rating from the choosible head flows (low perf, oval port, rect ect) and selecting that they are ported the numbers come up about 20hp higher than by selecting 882 flow charts

is this a reasonable gain from porting? according to my track MPH and weight i'm making more power than i expected apparently and i'm trying to track it down, could this be it?

Originally posted by onovakind67:
With the 600:

Brake_Tq······278·····324·····353·····372·····379· ····372·····344·····296·····240·····183

Brake_HP······79.3····123·····168·····213·····253· ····284·····295·····282·····252·····209
Exactly what is 'brake' HP/TQ? Or should I be asking what the difference is?

Thanks.

Brake horsepower is flywheel horsepower. The term 'brake' comes from the water brake used in many engine dynos.

Originally posted by onovakind67:
Brake horsepower is flywheel horsepower. The term 'brake' comes from the water brake used in many engine dynos. Gotcha.

I wonder why your numbers are about 50 less than the others?

Don't get me wrong, I figured I only had 300HP anyway. But its funny how the others number were so close to each other's and yours is lower by a decent amount.

What program are you using, onovakind?

These numbers are lower because EA3.0 takes into account much more than DD2000. I can add and subtract accessories, crankcaes windage, low friction rotating assembly, manifold heat, port volume, diameter and efficiency, vary the length of the headers and collector, muffler cfm, engine temperature, octane, etc.

onovakind67, where did you get EA3.0? can you get it off kazaa?

Our dyno shop owns a copy.