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Old 03-02-2010, 03:09 PM
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bbc427 need help making big power

I have a bbc 427 and I am looking to make at least 575hp or more with good torque what I have so far is a 950 Carb, dart single plan intake ported, stock iron 390 heads with large oval ports,2.19/1.88 valves,fully ported gasket match,bowel work,and chamber work. The compression is 11.5 or 12 I don't have a can picked out but I am wanting to run a solid roller. The motor is going in a 80 Monte Carlo and used for racing on the weekend. I really need help picking a good cam to make this horsepower number and thanks

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Old 03-02-2010, 09:15 PM
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Quote:
Originally Posted by dre1984
I have a bbc 427 and I am looking to make at least 575hp or more with good torque what I have so far is a 950 Carb, dart single plan intake ported, stock iron 390 heads with large oval ports,2.19/1.88 valves,fully ported gasket match,bowel work,and chamber work. The compression is 11.5 or 12 I don't have a can picked out but I am wanting to run a solid roller. The motor is going in a 80 Monte Carlo and used for racing on the weekend. I really need help picking a good cam to make this horsepower number and thanks
The problem is in knowing what the heads flow. That's why I didn't answer your PM yet. I found 3 different sets of data on ported 390's and haven't a clue which one to use to DynoSim your combination and help you choose a cam for it. Best I can do is to list the 3 different heads here and you tell me which figures to use.
Head 1.
0.100 71 58
0.200 138 119
0.300 193 145
0.400 233 168
0.500 272 189
0.600 299 202
0.700 318 210

Head 2.
0.100 74 71
0.200 143 126
0.300 207 158
0.400 250 178
0.500 284 200
0.600 309 218
0.700 322 232

Head 3.
0.100 85 73
0.200 161 141
0.300 230 175
0.400 283 208
0.500 332 234
0.600 354 257
0.700 361 274
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Old 03-02-2010, 09:46 PM
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We are also going to need what rear gear, what diameter rear tire, what converter, what transmission, your max rpm limit, 1/8 or 1/4 mile, and weight of the car.

The cam is the most important piece,... and the most complicated piece to pick. It requires lots of info to make a choice. List it up!!
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Old 03-03-2010, 09:01 AM
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bbc 427

I am running (4.10gear,tire o.d. 28.0, 4000 stall, 350 transfer, 7000 Max rpm, 1/8 mile racing,3000lbs car) if anything needs to be change feel free to let me know and I also have a powerglid trans. on standby
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Old 03-03-2010, 07:38 PM
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First thing that comes to mind is the rear gear. If you are SERIOUS about racing it you will need a lot more gear for the 1/8 mile, think 5.13's or 5.38's.

4000 stall will work with a 3-speed trans, but the glide will need more like 5000-5500 stall.

I hope you have something better than the stock type 7.5" 10-bolt rear in that Monte or you will quickly find out what an exploded rear looks like.

I don't like to give people direct cam picks, but I would be looking at 244-256 @ .050" intake duration, 250-262 @ .050" exhaust duration, about .630-.670" lift and a 108-110 lobe seperation, installed on a 104 intake centerline.

I am a big pusher of custom cams, call the company you like with all the specs you can provide and have their tech set you up with a grind matched to your needs. I like Crower, Bullet, Isky, Laser, I'm on the fence about Comp Cams as their tech department didn't really impress me, like I wasn't good enough for their time if I was only buying one cam, but the one they did grind met our expectations. Never a problem with Crower or Bullet, never dealt with Isky or Lazer but they are highly regarded.
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Old 03-03-2010, 09:19 PM
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bbc427

The reason I say 410 gear is because we do a lot of back street racing and from home to there is where I'm going to drive bout 5min away but if the gear u recommended is okay then I'm going for it. And with the rearend do aftermarket axles help with the 7.5 or do I go with a better rearend and the car will see sometime at the track but mostly back street racing not a daily driver
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Old 03-03-2010, 10:19 PM
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Quote:
Originally Posted by dre1984
The reason I say 410 gear is because we do a lot of back street racing and from home to there is where I'm going to drive bout 5min away but if the gear u recommended is okay then I'm going for it. And with the rearend do aftermarket axles help with the 7.5 or do I go with a better rearend and the car will see sometime at the track but mostly back street racing not a daily driver
A Driver compromise on gears would be 4.71-4.88, maybe 4.56 if you might also like some 1/4 mile action.

There is absolutely NOTHING you can do for the 7.5" rear to make it survive.

You are going to need a G-body specific Aftermarket 9" Ford, or something like the Moser or Strange Dana 60 G-body housing, or Moser 12-bolt aftermarket for the G-body.

There is a rare G-body 8.5" 10-bolt that will also work, it only came in the Buick Turbo T-Type and Grand National, and the Hurst Olds and 442's.

You might also want to look at the 8.8" Ford(Mustang and Explorer) swap into your car for a lower cost alternative. They are plenty strong, equal to a 12-bolt Chevy. Info at www.maliburacing.com
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Old 03-03-2010, 10:21 PM
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Maybe if you run that 7.5" rear end with a 575hp 427 you'll break an axle. You'd benefit us all then because you wouldn't be out street racing.
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Old 03-03-2010, 10:43 PM
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CompCams solid roller....
http://www.compcams.com/Cam_Specs/Ca...?csid=513&sb=0
11.5:1 SCR
Head #2 flow figures
Big headers, mufflers
Single plane Dart, 950
RPM HP TQ
2000 133 349
2500 189 396
3000 231 404
3500 300 451
4000 380 499
4500 457 533
5000 523 550
5500 571 546
6000 612 536
6500 631 510
7000 640 481
7500 635 445
8000 587 385
Peak volumetric efficiency 100.1% @ 6000
Peak BMEP 194.3 @ 5000
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Old 03-03-2010, 11:01 PM
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Little hot on the cam there Inspector? I didn't want to recommend anything that stout for a sorta street car LOL Maybe a little bit too hot for a 7000 rpm shift, if you are trying for a 4-500 rpm over the peak power point for the shift??
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Old 03-03-2010, 11:13 PM
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Go big or go home.
I'm just havin' fun Eric.....
Actually, I figure that with that much power, you could shift it at 6500 and never miss anything.....ya still got 500 hp @ 4800....YEEEEHAH....

Last edited by techinspector1; 03-03-2010 at 11:20 PM.
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Old 03-04-2010, 06:35 AM
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Looks like they don't still make the Herbert solid roller I had in my 427, it was a .638/.657, but this one is pretty close: http://www.dougherbert.com/8620bille...h=83_84_87_651

Quote:
RPM Range: 2700-6700Advertised Duration: 271/283Duration @ .050: 242/244Lift: .642/.663Lobe Center: 110c , Intended for hot street/strip applications. 3000+ stall or manual a must.
That 7.5 rear might explode just out of fear if you get that nasty 427 too close to it,
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Old 03-04-2010, 07:42 AM
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I have the comp 11-700-9 cam in my 396 ad she pulls sweet.
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Old 03-04-2010, 12:05 PM
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Quote:
Originally Posted by BBCMudbogger
I have the comp 11-700-9 cam in my 396 ad she pulls sweet.
Just to help out the rest of the board, here's the cam card on that cam....
http://www.compcams.com/Cam_Specs/Ca...?csid=508&sb=0

Swapped BBCMudbogger's cam into dre1984's motor, no other changes...
RPM HP TQ
2000 163 429
2500 219 460
3000 272 476
3500 344 517
4000 418 549
4500 487 569
5000 543 570
5500 588 562
6000 619 542
6500 634 512
7000 633 475
7500 619 434
8000 559 367
Peak volumetric efficiency 97.2% @ 5000
Peak BMEP 201.5 @ 5000

The break point between the two cams is 6500. Below that, the shorter MudBogger cam makes more power and torque. Over that, the dre1984 cam makes more power and torque. The shorter cam will require better fuel than the longer cam (makes more cylinder pressure).

Last edited by techinspector1; 03-04-2010 at 12:22 PM.
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Old 03-05-2010, 12:28 PM
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bbc427

Thanks for the information both cams look good and both made Max hp over 600 and is it true that bigblocks like a lot of lift this is my first bigblock that I'm building and I'm syllable learning about them
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