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Old 03-06-2006, 06:24 PM
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Horsepower estimate

Hello, I would like a horsepower estimate. I would also like anyones opinion on my engine component selection.

454 standard deck, bored .060 over
.340 dome forged pistons
eagle rods
Dart Pro 1 aluminum heads 320cc
1.7 roller rockers
BG 750 carb annualar boosters/mech sec.
MSD Billet distributor with a 6AL ignition
Holley electric fuel pump

Lunati Cam-Basic Operating RPM Range: 1,400-5,000 RPM
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 214 int./224 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 290
Advertised Duration: 280 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.501 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.527 in.
Valve Lift with Factory Rocker Arm Ratio: 0.501 int./0.527 exh. lift
Lobe Separation (degrees): 112

Tubular rear trailing arms w/poly bushings QA1 shocks

trans-700R4 B&M Heavy Duty
2400 stall speed
411 posi

Mostly street driven with occasional racing at the track.
Should I go with a higher stall?

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Old 03-06-2006, 07:14 PM
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There are free down-loadable HP calculators/dyno's in the Knowledge Base on this site.
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Old 03-07-2006, 06:55 PM
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thanks

thanks for the info
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Old 03-08-2006, 01:45 AM
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80,000 But Im just guessing
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Old 03-08-2006, 08:46 AM
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Those heads are WAY to big. You would be much better off with an oval port design. I would get a set of 781 or 049 oval heads and have them rebuilt and get some clean up porting done. You will have less money in them in the end, and you will have a matched combonation. If you really want an aftermarket aluminum head, I would recommend the Edelbrock performer RPM. The heads you are looking at are recommended for a 468 to 525 with a max RPM over 7000 RPM. Here is a good article comparing a rectangular port head to a oval head in a street application. Flow is not everything. The motor will perform much better if the parts are matched.


There was another part of this article where the specs of both sets of heads were given, but I could not find that one. This still gives you the general idea.
http://www.chevyhiperformance.com/te...ort/index.html

As far as a hp guess, with the ported 049's or 781's I would say around 450-500.

Adam
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Old 03-08-2006, 05:46 PM
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Horsepower Estimate

Thanks or the info. I was told by a friend that I needed the 320 CC aluminum heads because of the .340 dome pistons made the compression too high and the aluminum heads were needed to drop the compression ratio. I already purchased the heads (unfortunately).
Thanks
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Old 03-08-2006, 05:47 PM
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Horsepower Estimate

Only 80,000 horsepower...not enough...MORE POWER>>>UHHHUHHH(Tim Alllen impersonation)
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Old 03-08-2006, 05:57 PM
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Those heads are not to big!
Your cam and carb are to Small!!
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Old 03-08-2006, 08:06 PM
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Runner size has nothing to do with compression. Combustion chamber size does. Do you know how many cc's the domes are on on the pistons? That along with the combustion chamber size will allow you to get a good idea of the compression. In order to get a cam that matches those heads well, you would have to look at something with a minimum of ~250-255 @.050 duration. You could do that, but you would have to run around a 3500 stall, and make sure you are at 10.5:1 compression minimum. It would also help to run a victor JR. You can make this setup work, but it may not be what you were after. If the car is just a weekend toy, the larger cam and stall would not probably be a problem. If you are planning on taking it on highway trips, (which I assume you are with a 700 R4) you will not want to run a whole lot more than a 2500 stall or you will build up alot of heat in the tranny. A 700R4 with a 4.10 gear and around a 27" tire will run around 2200 RPM at 70 MPH.

Adam
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Old 03-08-2006, 08:53 PM
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Quote:
Originally Posted by jakejake1966
Hello, I would like a horsepower estimate. I would also like anyones opinion on my engine component selection.

454 standard deck, bored .060 over
.340 dome forged pistons
eagle rods
Dart Pro 1 aluminum heads 320cc
1.7 roller rockers
BG 750 carb annualar boosters/mech sec.
MSD Billet distributor with a 6AL ignition
Holley electric fuel pump

Lunati Cam-Basic Operating RPM Range: 1,400-5,000 RPM
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 214 int./224 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 290
Advertised Duration: 280 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.501 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.527 in.
Valve Lift with Factory Rocker Arm Ratio: 0.501 int./0.527 exh. lift
Lobe Separation (degrees): 112

Tubular rear trailing arms w/poly bushings QA1 shocks

trans-700R4 B&M Heavy Duty
2400 stall speed
411 posi

Mostly street driven with occasional racing at the track.
Should I go with a higher stall?
I'll guess about 550 HP @ 5000 RPM.
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Old 03-09-2006, 07:50 PM
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Horsepower Estimate

Quote:
Originally Posted by leejoy
I'll guess about 550 HP @ 5000 RPM.
I like that estimate!
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Old 03-09-2006, 08:01 PM
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Horsepower Estimate

The pistons are Part #STL-H581CP HI COMPRESSION .340" DOME

These pistons are for street and track race applications.

Teflon coated hypereutectic race pistons.

Piston specs: Compression@.030" bore

12.20:1 w/100.9cc heads
11.17:1 w/109.4cc heads
10.22:1 w/119cc heads

.340" dome

For stock stroke crank

1.640" compr. distance

Deck clearance .025

Skirt clearance .0015

For 6.135" rods press or full float fit

They are .060 over

I tried using the horsepower calculator but I'm not sure of the deck height and chamber volume.
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Old 03-09-2006, 08:20 PM
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Most forged pistons can stand to have the domes machined down. I would bet on around 580 to 600 motor HP. If you can get me the cam event numbers, IVO, IVC, EVO, EVC, I can run it on dyno 2000 when I get back home Sunday.
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Old 03-09-2006, 08:33 PM
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Horsepower Estimate

The cam specs are as follows:
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,400-5,000 RPM
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 214 int./224 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 290
Advertised Duration: 280 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.501 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.527 in.
Valve Lift with Factory Rocker Arm Ratio: 0.501 int./0.527 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No
Lifters Included: Yes
Lifter Style: Hydraulic flat tappet
Valve Springs Included: No
Retainers Included: No
Locks Included: No

I would appreciate it if you could run it on the dyno program and give me a closer estimate.
Thanks
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Old 03-09-2006, 09:21 PM
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Quote:
Originally Posted by jakejake1966
The cam specs are as follows:
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,400-5,000 RPM
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 214 int./224 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 290
Advertised Duration: 280 int./290 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.501 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.527 in.
Valve Lift with Factory Rocker Arm Ratio: 0.501 int./0.527 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.000 in.
Exhaust Valve Lash: 0.000 in.
Computer Controlled Compatible: No
Lifters Included: Yes
Lifter Style: Hydraulic flat tappet
Valve Springs Included: No
Retainers Included: No
Locks Included: No

I would appreciate it if you could run it on the dyno program and give me a closer estimate.
Thanks
I need the cam events in degrees from the cam card, IVO(intake valve open), IVC (intake valve close) EVO(exhaust valve open) EVC(Exhaust Valve close)
for example on my Big Block Chevy 30 over 396; IVO 43 IVC 83 EVO 83 EVC 43.
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