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Horsepower Estimate on a SBC 406

 
swooperchevy
I love my Chevy Chevette!
Posts: 18
Joined: 05/08
Posted: 05/13/09 06:32 AM

Hi guys, love the forum and all of the great info you give everyone. I was wondering if anyone could give me an idea of what kind of power my 406 will be making. Right now I have a 4 bolt 400 bored 30 over with main and head studs. I got a good deal on a eagle forged rotating assembly that says with 64cc heads it will have 13.1 compression. I also have a solid roller cam with 630/630 lift, 1.6 Harland Sharp rockers, Edelbrock Performer RPM intake and a Holly 850 double pumper. I am debating between a set of the Dart Iron Eagle Platinum 230 heads, AFR 210 Race Ready heads or the RHS Pro Elite Cast Iron 228 heads. Which heads would be better for my current setup and how much power will it make? This is all for drag racing only and my current setup runs across the finish line at 6800rpms. Thank you and any help would be Greatly Appreciated.  

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SMOKESHOW
I mow my lawn and find Chevys
Posts: 1001
Joined: 09/08
Posted: 05/13/09 07:39 AM

Sounds like a pretty stout combo.  I personally like the AFR's they a are a little bit more expensive, but the 210 cc runners will keep your velocity where you want it.  Not to take anything away from the Dart heads, as they are fine pieces as well.  I think your combo will make around 600 hp and 550 lbft.  I think you could find around 50hp and nearly as much torque changing to a quality single plane intake.  Or about half that much going to an RPM air gap.

Just out of curiosity what are the rest of your cam specs, stall speed. rear gear, vehicle weight and trans type?

Thanks.  

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swooperchevy
I love my Chevy Chevette!
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Joined: 05/08
Posted: 05/13/09 08:01 AM

Hi Smoke, thanks for the reply. I am not set on the cam yet but I was thinking of this one. Comp Cams #12-909-9 solid roller cam, Specs: .630-.630 lift 296-304 adv dur 260-266 dur @.050 104LS 4200-7000 power range. Stall Speed is 4500 in a powerglide with a brake. My rear gear is 4.56 with 26in tall tires. All of this is in a 78 Camaro that weighs 3400 pounds with me in it. Do you think that cam will work the best if I went with the Single plane intake? Thanks Again.  

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Pontiacman2
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Posted: 05/13/09 08:10 AM

I would go with the dart or afr heads.
You should be making at least 550-575HP and I agree with smoke a good single plane would make more power and match the combo better.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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SMOKESHOW
I mow my lawn and find Chevys
Posts: 1001
Joined: 09/08
Posted: 05/13/09 08:20 AM

You have a well planned out combo, I do think that changing to a single plane intake will make a big difference in your set up.  That performer is only designed to make power to 5500, it is an upgrade for a basic street set up.  Look at a victor JR and I think you will be a very happy man.

Some other cams to consider are the XR286R and the 300AR6.  I think either of these cams may make a little more power with the rest of your components.

But again I think the largest gain you will see at this point is in your intake.  

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BIGDAVES66
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Joined: 05/09
Posted: 05/25/09 06:39 PM

SOUNDS LIKE A GREAT COMBO.I TOO LIKE THE AFR HEADS.WITH ALL THAT CAM AND COMPRESSION,AND YOU SAID YOU ARE RUNNING 6,800 RPMS AT THE FINISH,DID YOU EVER THINK OF RUNNING A TUNNEL RAM WITH A SET OF 660 CARBS?? YOU CAN PICK UP A GOOD DEAL OF HP WHEN YOU GET IT SET TO YOUR COMBO.  

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swooperchevy
I love my Chevy Chevette!
Posts: 18
Joined: 05/08
Posted: 06/05/09 03:40 AM

Thanks everyone for the help. I am going to upgrade to a better intake but what is the different between the Victor Jr and Super Victor? Would a tunnel ram be that much better on my setup?  

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GibTG
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Posts: 1985
Joined: 10/03
Posted: 06/05/09 01:49 PM

The most user-friendly combo will be a single plane intake. It may be possible to extract some extra power out of a tunnel ram setup but it will be more difficult and the gains at around 6500 rpm won't be as significant as if you were to spin your engine higher (meaning tunnel rams are meant for very high rpm machines).

With less than .700" lift I would probably stay with the Victor Jr.  
~Gibs

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bigcam406
My first time was in a Chevy
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Posted: 06/08/09 07:48 PM

i'd go with the super victor,as it is worth approx 10-15 hp more over the victor jr. Grin  

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swooperchevy
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Posts: 18
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Posted: 06/10/09 08:25 AM

Which intake do you think would be better for my setup, the Super Victor or Dart Single Plane? I purchased the Dart Pro 1 230cc Platinums(Got a good deal on them). Thanks.  

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GibTG
I mow my lawn and find Chevys
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Posted: 06/10/09 09:46 AM

Have you ever thought why, "bigcam," Edelbrock even makes the Victor Jr. if the Super Victor will be superior by 10-15 horsepower every time?  
~Gibs

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bigcam406
My first time was in a Chevy
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Posted: 06/10/09 07:37 PM

hood clearance Shocked  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 06/10/09 11:11 PM

Wrong answer...

It's for the engines that don't demand as much plenum and runner volume, as to more adequately feed a more mild or a small engine. Judging from Edelbrock's estimate of 500 or so higher rpm range for the Super Victor I highly suggest having the engine to use one, and I'm unsure if the engine in question here has it.  
~Gibs

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bigcam406
My first time was in a Chevy
Posts: 206
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Posted: 06/11/09 02:45 AM

first of all gib,my response was meant as a joke.after reading the original question,and seeing the cam specs and the heads the original poster have provided,my answer is based on his combination and what would compliment it for the best results.mind you,a victor jr. would work,but why sacrifice power by using a manifold that has 25 yr old technology,when you can use the best of todays?  Grin  

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GibTG
I mow my lawn and find Chevys
Posts: 1985
Joined: 10/03
Posted: 06/11/09 09:49 AM

I'm afraid you're thinking of the "torker" manifolds. They are 25 year old manifolds meant for low hood clearance vehicles, the victor jr. is a much more refined design.  
~Gibs

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