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Old 05-02-2004, 03:49 PM
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350

could some one run this combo on the desktop dyno. 76 350 60 over flat top pistons -6cc 0deck 882 chevy heads ex energy 274 comp cam 750 holly vac performer intake 1 5/8 headeres. this going into a 85 chevy oickup 2wd with 350 tranny 340 gears. what kind of hp am i looking at at? will i have vac for my brakes?

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Old 05-02-2004, 05:07 PM
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I have almost the exact same engine in my truck and it came out at just under 300hp on the desk top program. Nothing spectacular but it runs very good for a heavy truck.

Mark

.030 over 350 high tin and high nickle 2 bolt block.
SpeedPro Hyperutectic, teflon coated pistons.
Chrome molly top rings, cast middle rings.
Block decked to achieve a quinch distance of .046.
Crank turned .010/.010 and balanced.
Rods resized and weight matched.
Crane 276 duration hydralic cam.
Crane 1.5 ratio full roller rocker arms.
One piece stainless steel undercut valves.
Head work, , bowl work and short leg work.
Intakes enlarged to 1.94 for better flow and good low end.
Comp cams HP pushrods.
True double roller timing set.
Felpro gasket set.
New Edelbrock Performer intake.
Re-worked new 750 Quadrajet carb.
Plus all the small goodies that go into a good engine.
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Old 05-02-2004, 05:21 PM
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Assuming you're keeping stroke/rods the same, the same compression height on the pistons, Mufflers, Standard Dual-Plane Intake, .040 head gasket, and Stock flow/valves on the heads.
Desktop came up with:

8.64:1 Compression Ratio
429 HP @ 6000
420 Ft/Lbs @ 4500

Although that seems far off from Jmark's number....

And at close to .500" lift, those heads dont flow to well.

And I've put in numbers from crate engines... at the most it was ever off was 14HP/10 ft.lbs
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Old 05-02-2004, 05:37 PM
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Quote:
Originally posted by arch
429 HP @ 6000
420 Ft/Lbs @ 4500

429hp???? I wish!!! LOL Something must be off in the program somewere.

Mark
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Old 05-02-2004, 05:58 PM
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Yeah... I dont know what happened with that, sounds like to much to me... was around 500 with open exhaust... And the heads barely flow 140cfm at full lift, and I was reading the head work you did on yours.... and you're under 300... Im lost on it...

[Edit]
I forgot to mention those numbers are at the flywheel.

Last edited by arch; 05-02-2004 at 06:43 PM.
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Old 05-02-2004, 06:05 PM
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I have a similar motor in my S10-
350 2 bolt mains
cast flattop pistons w/valve reliefs (-4cc?)
882 heads w/1.94/1.50 valves and gasket matched intake ports
performer intake and carb (1406)
Crower 267HDP cam (210/214 and .444 lift)
small tube shorty headers w/ dual exhaust
TH350 trans w/12", 2400 stall converter (it only flashes to 2000)
3.50 gear with 28x10 tires (275/60-15)
weighs 3165# as driven
it has run a best ET of 14.05@97.57mph on street tires
1300 rpm launch, shift at 5200
DD 2000 rated it at 327hp@5000 and 368ft.lb.@4000
a slightly larger Isky 270H (221 and .465 lift) showed 316hp@5000 and 362ft.lb@4000 (it was down 5-16hp and 9-16tq. over the curve) on the same dyno program.
Estimating from the ET it has 220rwhp.
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Old 05-02-2004, 07:02 PM
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Quote:
Originally posted by arch
Assuming you're keeping stroke/rods the same, the same compression height on the pistons, Mufflers, Standard Dual-Plane Intake, .040 head gasket, and Stock flow/valves on the heads.
Desktop came up with:

8.64:1 Compression Ratio
429 HP @ 6000
420 Ft/Lbs @ 4500

Although that seems far off from Jmark's number....

And at close to .500" lift, those heads dont flow to well.

And I've put in numbers from crate engines... at the most it was ever off was 14HP/10 ft.lbs
Whooooieee! I got me a thousand horses under my hood then!

I gotta get one'o them thar desktop dynoguessers too!
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Old 05-02-2004, 11:39 PM
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Does anyone know of a better dyno program? DD 2000 is not accurate in many ways. It doesnt allow for the different stock heads for one thing (Vortec versus smoggers) Also try having a stock 350 and start adding dumb stuff like a dual tunnel ram intake with two 1050 cfm carbs. Watch the no's soar! I find mine is close to what I think it should be on very normal and predictable engines but start being a hot rodder and it can give you over inflated no's or poor ones. (usually too high)
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Old 05-03-2004, 02:34 PM
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I used DD2003... Although not the best program on the market, its normally pretty acurate. Why the numbers were so high, I have no Idea. I used the flow numbers from the stock 882 head. And the all of the cam's IVO/IVC/EXO/EXC/centerline. Maybe somebody else would like to try? Did I put something in wrong?
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Old 05-03-2004, 02:55 PM
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you're not using the program right. Find the flow numbers for the heads at each lift point and put them in, look under the little icon that looks like air flowing past a valve. Secondly, use the exact cam specs, not the pre-generated good-for-nothing cams they have on the program. You'll get a lot more accurate.

In fact, don't bother. Here are about 100 heads and 100 cams professionally numbered for dyno 2000. These produce accurate results.

Great set of downloads-

K
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Old 05-03-2004, 03:59 PM
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Assuming you have around a 9:1 compression since not really sure what head gasket you intend to use. Here is what I came up with

334hp@5000rpm
384tq@4000rpm
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