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Old 03-13-2009, 02:41 PM
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406 sbc suggestions

I have a 406 sbc with 12.5-1 pistons and chevy phase 2 bowtie heads with 2.05 intake vales and 1.60ex have been ported out quite a bit with a super vistor intake and a performance carburetors holley 750 stage 2 and the came is a custom grind from lunati solid roller with 668 max lift and 270 intake and 260 ex at .50 with 110 lobe seperation. the motor is going to be about 14.3-1 compression after milling the heads and it will have 1'' 7/8 race headers to 3 in collectors. i was wondering if there was any opinions or useful help on anything i should change and if someone could desktop dyno it. it is an all out race motor and will probaly never see the street and i'm open to any suggestions

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Old 03-13-2009, 02:52 PM
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If you have head flow figures and complete cam specs with intake and exhaust centerlines or opening and closing figures at 0.050", I can dyno it for you. Otherwise it would be only a guess.
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Old 03-15-2009, 09:17 PM
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the flow numbers are and the specs of the cam are 668/646 max lift and 272/280 duration @50 with 106 intake centerline and 113LSA and the events are IO- 28 BTDC IC 64ABDC EO 78 BBDC EC 22ATDC
intake exhaust
.100 68 60
.200 133 118
.300 186 145
.400 224 160
.500 236 168
.600 245 173

If anyone else has any input that would be awesome and maybe have some people throw out some numbers
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Old 03-15-2009, 11:40 PM
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I would expect to see 515-535 horsepower from the parts you have. You are giving up a potential 60+ horsepower by using the Bowties if those flow #'s are correct, those #'s are no better than stock iron Vortec heads. Bowtie heads are known for being really small and needing a lot of work to make race-type airflow.

If you were looking to get up to the 600 hp mark, you will have to send the heads to a good professional head porter who can get them up to the 280cfm mark on the intake side and close to 200cfm on the exhaust.

Might end up cheaper to sell the heads you have and buy a more modern aftermarket casting if you are looking for big power.

Rough rule of thumb for everyone reading: Head peak flow # times 1.9 = horsepower for race hydraulic; #'s times 2.0 for solid; #'s times 2.1 for solid roller; this will give you a rough estimate to allow you to pick parts for your race application.
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Old 03-16-2009, 12:33 AM
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Phase II Bowtie
RPM HP TQ
2000 120 314
2500 181 381
3000 223 391
3500 282 423
4000 351 461
4500 423 494
5000 490 515
5500 536 512
6000 569 498
6500 586 474
7000 587 441
7500 578 405
8000 545 358

AFR 210 (301 max intake flow) head change only, all else the same....
RPM HP TQ
2000 114 300
2500 178 373
3000 218 381
3500 274 411
4000 346 454
4500 423 494
5000 497 522
5500 556 531
6000 600 525
6500 630 509
7000 647 485
7500 651 456
8000 637 418

Going by the timing figures you posted, the intake centerline is 108, the exhaust centerline is 118 and the lobe separation angle is 113.
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Old 03-16-2009, 12:45 AM
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Inspector, what engine program are you using? Most of the stuff I've seen you post lately seems awful optimistic on the power #'s compared to real world experience.
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Old 03-16-2009, 01:00 AM
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DynoSim Advanced version 4.20 with Pro Tools.

Checking it against actual dyno pulls, it seems to be within 2%. If you think it's optimistic, multiply all the numbers times .9 or .8 or whatever you think would be realistic.
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Old 03-16-2009, 01:07 AM
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Depending on the application of this motor and the converter stall, you may be interested to see the results of using AFR heads with a RPM Air Gap intake.....more power and torque through 6000....
RPM HP TQ
2000 127 333
2500 182 382
3000 227 398
3500 286 429
4000 360 472
4500 443 517
5000 518 544
5500 568 543
6000 606 530
6500 629 508
7000 630 473
7500 632 443
8000 602 395
Volumetric efficiency reaches a peak of 118.2% @ 5500 with this combination.
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Old 03-16-2009, 01:23 AM
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Yeah, I worded it wrong in my previous post, because I agree with all the AFR results you've posted. It just seems too high on the "stockish" type head. Do you agree with the power #'s given for the low peak airflow Bowties? Just curious, friendly info question, I try to learn something new every day.
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Old 03-16-2009, 01:29 AM
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"Do you agree with the power #'s given for the low peak airflow Bowties?"

In a word, no. I was a little surprised to see the numbers, but maybe the 14.3 SCR rattled the software a little
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Old 03-16-2009, 01:48 AM
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O.K. , yeah, I just felt that the Bowtie headed combo was going to start to run out of breath up over 6500+ rpm.
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Old 03-16-2009, 05:53 AM
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406 sbc

i have a 406 sbc thats getting ready to be punched out to 0.40 i'm going to use stock 400 crank turned 10/10 can i use manley 5.7 rods inside? It will have flat topps in it also.And does any machining need to be done to block? I'm not sure what heads im going to use i have a set of dart iron eagles that are 64 cc and a set of pro topline that have 50cc. Anybody have any info on bottom end would be helpful thanks.
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Old 03-16-2009, 07:35 AM
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This motor is goin into a mud truck and class rules only allow chevy cast iron heads otherwise it would have a set of AFRs on it because that is my biggest limiting factor on makin HP
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Old 03-16-2009, 11:55 AM
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I recommend less cam and more head. comp cams has a 266/277 - .680 gross lift grind that would work better. i also think a carb change is better. prosystems seems to be the ticket these days. talk to patrick. with iron heads, you could do better with dart/world heads. you can find a cheap set used that has probably already been worked over for around 500 every now then. a little more work and 280cfm possible and that will be enough to get you over 600. friend has similar motor as this 14-1 motor but al heads runs 9.7-138 mph 3100 lbs
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