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  #31 (permalink)  
Old 08-25-2012, 08:17 PM
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CD? a 327 making 400 pounds torque at what RPM? That would be a very impressive little engine,,,depending on gearing and rpm.
Obviously the cam is too small if the horse power is below the torque figure especially a 327

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  #32 (permalink)  
Old 08-25-2012, 08:31 PM
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HP and torque

390 hp at 5500 rpms and 412 lbs torque at 4000 rpms. It is a mild roller cam sscamaro_510 picked.
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Old 08-26-2012, 12:10 AM
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Quote:
Originally Posted by cdminter59 View Post
390 hp at 5500 rpms and 412 lbs torque at 4000 rpms. It is a mild roller cam sscamaro_510 picked.
That sounds like the numbers I was looking for,thanks for your input. Should be a fun lil engine if it's puttin out that kind of power.
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Old 08-26-2012, 06:41 AM
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Lunati part numbers

These are the part#s for the cam, lifters, and valve spring kit that you need. 10030 Cam Specs: Cam Spec Card :: Lunati Power Valve spring kit # 73943K1LUN Lunita Hyd. Roller Cam & Lifters # 20080130LK
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  #35 (permalink)  
Old 08-26-2012, 07:31 AM
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Quote:
Originally Posted by vinniekq2 View Post
Obviously the cam is too small if the horse power is below the torque figure especially a 327
Another completely unfounded statement. If you don't like how the torque and hp numbers compare to each other then use the metric equivalents. The numbers will change, though the power won't.

Instead of worrying about torque at all just select a cam that produces the most power at the rpm that you'll be using. Peak torque is a relatively useless number, power at "X" rpm is what you really need for a valid comparison.
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Old 08-26-2012, 08:13 AM
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ap72,please learn the rule of 5252.
perhaps my wording is poor.A bigger camshaft applied to the above dyno sim test would make a significant improvement to the power the engine could make.
In terms I understand though not technical,the peak hp being 2 or more k higher than peak tq rpm will usually indicate higher hp numbers than torque.when you reach 5252 rpm,that is usually the x over spot,or it should have happened by then.There is hp being left on the table somewhere???

a 5500 rpm 327 though perky is no where near what it should do. a 1500 rpm range is too narrow for idael acceleration.In a perfect world you shift at max hp and the transmission drops the rpm to max torque rpm.not many transmissions drop 1500 rpms between shifts.
I wont post a detailed explanation like Bogie,that guy does a much better job of explaining the details
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Old 08-26-2012, 10:29 AM
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I keep coming back to these two also:
Street Master Cam - Chevrolet Small Block 276/286 - Lunati Power
Voodoo Hyd Cam - Chevrolet Small Block 268/276 - Lunati Power

Would those make more power?
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  #38 (permalink)  
Old 08-26-2012, 11:23 AM
How fast is fast enough?
 
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Quote:
Originally Posted by vinniekq2 View Post
ap72,please learn the rule of 5252.


In terms I understand though not technical,the peak hp being 2 or more k higher than peak tq rpm will usually indicate higher hp numbers than torque.when you reach 5252 rpm,that is usually the x over spot,or it should have happened by then.There is hp being left on the table somewhere???

a 5500 rpm 327 though perky is no where near what it should do. a 1500 rpm range is too narrow for idael acceleration.In a perfect world you shift at max hp and the transmission drops the rpm to max torque rpm.not many transmissions drop 1500 rpms between shifts.
I wont post a detailed explanation like Bogie,that guy does a much better job of explaining the details
Again, there is absolutely no good information in any of this, BUT it does come from a long line of misunderstood BS, so it is understandable how a person may come to believe it carries some merit.

hp and tq always cross at 5252, there is no significance of that number though other than how hp and torque are defined, switch to metric readings and 5252 carries no significance.

To a certain point running a larger cam will produce more hp and it will produce it at a higher RPM... which means that if you don't ever run in that RPM the "increase in power" will actually make your car slower as it results in a loss of power in a lower RPM. Which is why you need to compare power output at the same specified rpm to get a better comparison.

For a perfect shift on a race track you do NOT shift at peak hp down to peak tq, you shift to maximize your average hp, meaning you shift past peak hp and fall to a place right below peak hp (how far in each direction depends on your power curve).

A 5500 rpm 327 maybe exactly what is needed depending on the application. If you run 50hp less than a more aggressively built 327 but are never in the rpm range it makes the additional power the engine with less power can actually make your car run a little faster.
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  #39 (permalink)  
Old 08-26-2012, 11:49 AM
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Cams

Quote:
Originally Posted by sscamaro_510 View Post
Relax, the Lunati roller cam make way better power than those two hydraulic cams. I don't see what these guys are gettin excited about those number are not exact but a guide. The dyno sim doesn't have flow numbers from your heads,exact rear gear ratio, etc.
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  #40 (permalink)  
Old 08-26-2012, 12:36 PM
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cd,I agree with you,the roller would make more power.better duration for a 327 and more lift.The power would increase everywhere,including the bottom end. A bigger cam does not "always" mean a loss of low rpm torque. neutron meters and kilowatts are different ways of expressing something that humans can kind of understand.
and thanks for reiterating that a wider power band is required to match transmission ratios.
I no longer have a desire to argue here. 327s make power at higher rpms than 350s.putting a smaller cam in a smaller engine is not entirely accurate for rpms. duration is time,lift is flow,o
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  #41 (permalink)  
Old 08-26-2012, 01:20 PM
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Quote:
Originally Posted by cdminter59 View Post
Relax, the Lunati roller cam make way better power than those two hydraulic cams. I don't see what these guys are gettin excited about those number are not exact but a guide. The dyno sim doesn't have flow numbers from your heads,exact rear gear ratio, etc.
You're right,I think that's the cam I'm gonna go with. Should have plenty of power to dust the occasional Mustang lol.
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  #42 (permalink)  
Old 04-03-2013, 06:35 PM
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Well after many months the car is almost together,another couple Weeks...can't wait!

This is what I ended up going with:
327 bored .030
9:6:1 Compression
Balanced
Edelbrock E-tec 170cc heads.
Edelbrock RPM Air-Gap
Stock crank and rods
MSD Ready to run HEI Distributor
MSD Wires
Comp XR270HR Hydraulic Roller Cam
Comp Valve Train
1.5 Roller Rockers
Holley #4150 650cfm Vacuum Secondaries
1 5/8 Headers
2 1/2 Dual exhaust into flowmasters

Gonna put a TH-350 and 3.36 rear gears behind it...what kind of HP/TQ am I looking at with this combo?
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  #43 (permalink)  
Old 04-03-2013, 06:56 PM
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I see the HP at 390 ish,torque? maybe 375 plus? 6k maximum RPM for power
how does it go?
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Old 04-04-2013, 05:02 AM
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Aluminum Heads for Mild 327?

What happened to the Edelbrock Performer Rpm heads? If I was building a 327 ci My choice would be the Edelbrock Performer Rpm heads with the matching Edelbrock Performer Rpm intake maniflod. I have read where people are having too many problems with the air gap manifold. You can do a comparison here on Hot Rodders forum between the Performer RPM and the Performer RPM Air Gap. On the rear gears I would go with 342's or 355's. That 327 needs to get the rpms up quick. Most people use 373's for the street and with OD transmission use 4:11 or 4:56. Good Luck, nice Camaro. It looks like a copy of my 67 RS/SS Camaro. 491 ci, TH400, 12 bolt 4:11 rear, Caltracs and frame connectors too. Front suspension replaced with Global West upper and lower control arms. Unisteer manual Rack and pinion also.
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  #45 (permalink)  
Old 04-04-2013, 11:27 AM
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To be honest when I skimmed over this thread and saw 327 and aluminum heads the first thought that enter my mind was lean on the compression,build a RPM capable bottom end,cam it to buzz to the moon with heads accordingly to breath.Remember the Camaro's are heavy cars that need that to move them.
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