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Old 07-14-2006, 12:39 AM
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406 build up,,, need to have more HP

hello,,,, i got a fresh 406 sbc,,, 515 cam. stock heads other then 2.02 valves and screw in studs,and roller tip rockers.. also its running a tunnel ram with 2 450cfm on it that seem to be acting great for a tunnel ram..,,, its not performing like i think it should, just not fast enough for me, its only going 100 mph in the quarter at low 13's at times,,, only reeving and shifting at 5000 to 5500 rpm seems to be all its got,,,i really want it to be a mid 12sec car that is still able to drive on the street time to time.... what is a good match as in cam/heads/intake/carb/ to make a 406 come to life on a budget build???? it is in a 55 chevy mini tubed with all the goodies built great as far as the body and frame goes... its got 411 gear also... what parts seems to be a good match to make a 406 run and rev the strongest??? any suggestions would be helpfully thanks

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Old 07-14-2006, 01:22 AM
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Can you completely describe the car? A mild 406 should be able to put you solidly in the 11's and still be a daily driver.
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Old 07-14-2006, 01:55 AM
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the car has a narrowed 9in ford,, 411 gears,,,29/12.5/15 micky t sportman's on it... 14 pt cage... 4 link with ladder bars also,,,all the other goodies underneath... its a 406 pop up piston motor,,, 515/515 cam... stock heads w/ 2.02 valves screw in studs. 1.5 roller tip rockers.. pink rods.. it has Wieland tunnel ram w/2 450cfm carbs that seems to work fine.. mallory distributer, timed at 36 degrees,, 3500 stall... fenderwall headers.. i think the car only 3400 pounds... it dont seem to like going over 5500 rpm 6000 tops... i think the way the car is set up it should be at least in the 12's....it best top speed was only 99.3 mph.. what all do you need to know??
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Old 07-14-2006, 06:27 AM
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two other questions: what duration cam and what casting number heads are you running?
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Old 07-14-2006, 07:57 AM
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Stock heads is your problem. You really need to spend about 1000.00 and get a good set of aftermarket heads. A set of Edelbrock RPM heads would be a good choice. Check out chevyhiperformance.com . They recently did a less than 1000.00 cylinder head comparison which included 8 different cylinder heads on a 383. The Edelbrock RPM's seem to be the best for street/strip applications.
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Old 07-14-2006, 08:50 AM
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I use to know a guy with a 55 chevy and a mild 383 and would run low 12`s high 11`s. It was a 393 with dish pistons, 9.5:1 compression, Isky 292 mega cam, dart 200cc heads with bolw work and gasket match 2.05/1.6 valves,vic jr and 750 holley. th350 3500 stall, 9" rear with 4.30 gears slapper bars and 28X9 slicks.


your heads are definately a big part of your problem. Your cam sounds like the lunati bracket master cam but your heads are garbage. if you plan to keep this on pump gas, you`ll need a set of heads with 76cc like the stock heads. otherwise you`ll be about 13:1 with 64 cc cheads. I would get a set of IronEagle 200-215cc runner heads, do some bolw work and a gasket match and see how it runs then. if ti`s still not fast enough then, it`s time to change that cam to a solid cam or solid roller. rigth now my buddy has a 64 chevelle with a 406 with 9.5 compression and Dart Pro 1 215cc runner aluminum heads and a Isky 304 Mega cam and 4.11 gears and it would run in the 11`s pretty easy. he hase`nt taken it to the track with this motor yet but he has raced a friends late model camaro that runs low 12`s and blew him away pretty easy. you just need som good heads and then possibly a bigger cam.
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Old 07-14-2006, 10:58 AM
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Turning that low of an RPM it sounds like you might be running out of camshaft, and cylinder heads. Also, your torque converter may be a little too tight.
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Old 07-14-2006, 02:29 PM
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I agree on the heads holding you back. A set of aftermarket heads should make a huge difference. I think a set of Dart 215cc Iron eagles or AFR 210's along with a cam in the high 240's to low 250's at .050 duration would wake that motor up. This should work well with the 3500 stall and send you deep into the 12's, or 11's with the AFR heads. This is assuming that you are at at least 10:1 compression.

Adam
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Old 07-14-2006, 02:58 PM
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I put a hydraulic roller in my 406 (Crane Powermax 240,248, 306/314adv.) and love it! Costs a little to swap over, though. That would probably help a bit over a flat tappet anyway.

But I do also agree with everyone on the heads. I put the Pro 1 230cc on mine, which may be a tad too big, but she runs pretty good. The 215s I'm sure would work great - but I don't know which would work better on the top end. . . .
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Old 07-14-2006, 09:02 PM
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Quote:
Originally Posted by tiresmoke55
hello,,,, i got a fresh 406 sbc,,, 515 cam. stock heads other then 2.02 valves and screw in studs,and roller tip rockers any suggestions would be helpfully thanks


It sounds like you have vibrations in the carbs, does it loose power suddentley, like it hits a wall?
DoC
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Old 07-15-2006, 10:27 AM
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Low 13s at 100 is very respectable. It shows that your chassis is well set up. So let's talk power to get trap speed.

David Vizard has done a lot of writing this past couple years about SBC with pop up pistons. He says that domes taller than .125 block the flame front and actually ruin power, sometimes killing up to 100 hp. He's right, we discovered this 30 years ago.

I would suggest going to a flat top piston with a corresponding head (AFR 210 makes more power per airflow), getting all the quench you can with a high swirl chamber.

Avoid domes above .125 and contour the dome edges.
A cam grind designed for the heads will be necessary, as well as a corresponding valve train to turn 6500 rpm.
I'd stick with your present intake and do one step at a time.

Each step should remove the next major restriction in your set up.

You might also do a search for "head grooving" on this site and then study about it yourself, or contact "automotivebreath". I believe it works.

www.readershotrods.com
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Old 07-16-2006, 12:05 AM
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hello guys... thanks for all the info!!!! this week at the track im going to try a few things that might help alittle bit... like i said im running a 29 in tall tire now, i just got a set of 28 in tall slicks.. i think this is going to help bring the rpm's up in the big end.... also i got a set of 64cc hump heads w/ 2.02 and there ported a little bit i might try them also this week?? compared to a stock 400 head with only big valves do you think the 64cc humps will help me that much?? its a little bit of work to do and it not go any faster you know!
1 more question... like i said my tunnel ram with 2 450 cfms seems to be working good but would it be best to run 4 say a victor jr intake with a signal 750cfm carb?? what your opinion
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Old 07-16-2006, 07:47 AM
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64cc heads with domed pistons in a 406 is going to put your compression ratio through the roof....
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Old 07-16-2006, 08:03 AM
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Even with oem style heads, I would think you could do a little better than 13's with the proper tuning. I would make certain that you aren't running low on fuel pressure at higher RPM. I would want you to double check your timing, and be certain that your balancer is indexed. You will need at least 36 degrees total timing with big 76 cc chambers.

Have you looked at the spark plugs, does it look lean to you after a run?

Did you degree the cam?

You have enough equipment to get into the 12's if you work with it.


Brian
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Old 07-16-2006, 09:22 AM
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Quote:
Originally Posted by NAIRB
Even with oem style heads, I would think you could do a little better than 13's with the proper tuning. I would make certain that you aren't running low on fuel pressure at higher RPM. I would want you to double check your timing, and be certain that your balancer is indexed. You will need at least 36 degrees total timing with big 76 cc chambers.

Have you looked at the spark plugs, does it look lean to you after a run?

Did you degree the cam?

You have enough equipment to get into the 12's if you work with it.


Brian
im running a elect fuel pump regulated at 8psi... im not running out of fuel.. i do believe that it is a timing issue... ill See what happens thanks...
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