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Old 03-26-2011, 10:27 AM
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Budget 406 SBC Parts Selection

Good Day,

I'm halfway through the rebuilding process of my stock 400 sbc. Block is @machine shop, had a crack in it and missing a freeze plug, spun a bearing, all that good stuff So now it's a cleaned-up 406. This is the parts list thus far:

Stock reground crank
GM 5.7" rods, ARP bolts installed
KB Hyper -22 dish pistons
Vortec heads with a little work, polishing, .570 lift springs installed
Performer RPM intake
*questionable* Crane 284xe
3.55 gears
still have to buy stall converter, looking @ a 2800-3200 (or could I go for one step BELOW that, to take advantage of the 400's torque?)

Just looking for KEEN ADVICE from a vast source of knowledge, HOTRODDERS.COM

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Old 03-26-2011, 12:08 PM
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Needs more converter (10" 3500stall) and more gear (3.73-4.10).

The block needs to be "0 decked" or the cr will be low.

What vehicle is this motor going into?

How will it be used?
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Old 03-26-2011, 01:39 PM
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That High a stall???

Hey, thanks for responding... The motor is going in a 1980 regal. It will be used as a weekend warrior, street machine, with maybe 2 trips to the track a month, if that. But I would also like to drive it on the highway to work on some sunny fridays or whatnot.
I was hoping to buy a convertor with a LOWER stall, I've read that I don't wanna spin this motor to the moon to make power. Would I be inherently loosing out on all the available torque by using a 3,500 stall????

Is there ANY way to run this cam on the street in a 406 sbc? Does it cost extra to 0 deck the block? I AM paying to have this motor balanced, but I'm not sure of zero decking.
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Old 03-26-2011, 02:28 PM
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Yes this cam runs real good on the street. But needs a good converter and gears. Its wants to rev. A 3000 stall is not really enough for this cam and 3.55 gears are not enough for this combo in a Regal.

Anything less than a 3000 stall is not going to work well.

I recomend a 10" "3500 stall" and 4.10's.. Get short sticky P235-60-15 drag radials or ET streets and taller 70 series conventional street radial tires 27-28" tall for extended cruise duty.

Get a drive shaft loop and some rear Airlift air bags for your regal so it will hook up.

Picking the wrong converter stall and gears is one of the most common mistakes.

This combo drives very well on the hiway with a 3500 stall and 4.10's.

I shift mine at 6000 rpm. traps at 6600 rpm (115MPH). Runs fine on the hyway @60mph.

This cam needs a minimum of 24-26deg idle timing and 32 to 36deg max advance. (I run mine locked out)

10-15deg of vacuum advance.

If you wimp out on the converter and gears you will be dissapointed at the track and on the street. A high perf motor wants to rev.

I drive mine to the track and sometimes to work too. The mileage is actually quite good with 4.10's. High perf motors with a healthy cam like the XE284H-10 do not like a low cruise rpm. The motor is not efficient at low rpm. Let it rev.

Decking the block is a machining operation. If you want the true 9.8:1 cr you have to have a true verified 0 piston/deck clearance @TDC with the -22 cc pistons and a 64cc head. Ya it matters. You do not want a low compression ratio with this cam. You do not want a wimpy converter and gears with this cam.
Going fast is all about details.

Last edited by F-BIRD'88; 03-26-2011 at 02:49 PM.
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Old 03-26-2011, 02:37 PM
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here is somthing a bit more appropriate if you want to run less stall and compresion.
edlebrock performer rpm #7102

ENGINE: CHEVY 283-400 V8
RPM RANGE: 1500-6500

Duration at 0.006" Lift: Intake: 308 Exhaust: 318
Duration at 0.050" Lift: Intake: 234 Exhaust: 244
Lift at Cam: Intake: 0.325" Exhaust: 0.340"
Lift at Valve: Intake: 0.488" Exhaust: 0.510"
Timing at 0.050" lift: Open Close
Intake: 10 BTDC 44 ABDC
Exhaust: 59 BBDC 5 ATDC
Centerlines: Lobe Separation - 112 Intake Centerline - 107



you may loose a few hp but it will be more in tune to what you need on the street.
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Old 03-26-2011, 02:41 PM
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Quote:
Originally Posted by mud bros
here is somthing a bit more appropriate if you want to run less stall and compresion.
edlebrock performer rpm #7102

ENGINE: CHEVY 283-400 V8
RPM RANGE: 1500-6500

Duration at 0.006" Lift: Intake: 308 Exhaust: 318
Duration at 0.050" Lift: Intake: 234 Exhaust: 244
Lift at Cam: Intake: 0.325" Exhaust: 0.340"
Lift at Valve: Intake: 0.488" Exhaust: 0.510"
Timing at 0.050" lift: Open Close
Intake: 10 BTDC 44 ABDC
Exhaust: 59 BBDC 5 ATDC
Centerlines: Lobe Separation - 112 Intake Centerline - 107



you may loose a few hp but it will be more in tune to what you need on the street.
This cam also will not perform well with less than a 3000 stall and 4.10's in the car.

This cam needs the same (4.10) gears and (3500+) converter as the XE284H-10 This cam is very similar to the Comp cam.

Compression ratio, converter stall and rear gear ratio are critical to making these cams work. They do work very well when the other stuff is right.
Again do not wimp on the cr, converter or gears with this RPM cam. Or any other similar cam.

Last edited by F-BIRD'88; 03-26-2011 at 02:56 PM.
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Old 03-26-2011, 02:48 PM
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If you got to be a wimp and run a 3000 or less converter and 3.55 gears in your Regal, use a smaller milder cam with less duration, like this Isky 270 Mega cam and 1.6 rockers. Isky #201271 270-270-221-221-.495" lift w/1.6:1 rockers.
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Old 03-26-2011, 02:52 PM
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Thank You!!

Wow.. I knew iI would hear some news conflicting my thoughts on the combo , but, that's why I came here in the first place. To get the truth, no matter HOW ugly it may be to me. I wanted to keep my 3.55's and go with a 2800 stall, but if the motor will be LOTS happier with a true 10" 3k+ stall, then that's what I'll be springing for.

I actually have the 'Brock rpm cam and lifter set in a 355 that i'm about to sell, freshley installed. But if that warrants the same stall and gear, I'll go ahead with the 284XE.

My main concern was NOT utilizing my powerband below 3000 rpm, where I hear the 400 sbc shines. I was also assuming my redline would be ~6k. But F'Bird's shifting @6K, i should be able to raise my redline also???

I'll be asking my machinist what my deck height is and my quench. Is there an optimum compression I should be seeking for pump gas, 64cc vortec's and -22 dish Hypers???

FINALLY, can I throw on a cheap 100 shot of giggle gas for good measure??? any preparation in that???
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Old 03-26-2011, 03:08 PM
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Quote:
Originally Posted by MrChevyDC3
Wow.. I knew iI would hear some news conflicting my thoughts on the combo , but, that's why I came here in the first place. To get the truth, no matter HOW ugly it may be to me. I wanted to keep my 3.55's and go with a 2800 stall, but if the motor will be LOTS happier with a true 10" 3k+ stall, then that's what I'll be springing for.

I actually have the 'Brock rpm cam and lifter set in a 355 that i'm about to sell, freshley installed. But if that warrants the same stall and gear, I'll go ahead with the 284XE.

My main concern was NOT utilizing my powerband below 3000 rpm, where I hear the 400 sbc shines. I was also assuming my redline would be ~6k. But F'Bird's shifting @6K, i should be able to raise my redline also???

I'll be asking my machinist what my deck height is and my quench. Is there an optimum compression I should be seeking for pump gas, 64cc vortec's and -22 dish Hypers???

FINALLY, can I throw on a cheap 100 shot of giggle gas for good measure??? any preparation in that???
The cr should be not less than 9.8:1 and not more than 10.5:1 for pump gas.

If you want to run nitrous (never buy a "cheap nitrous system") get the machinist to go big on the ring end gaps with the KB pistons.
The KB instructions are very clear. And they are not kidding. Bigger is better and ya it matters. This is a critical detail. Pay your machinist to do it right or do it yourself. (big .032" to .034" top ring end gaps for nitrous)

I recomend when running nitrous on this motor, you run a minimum of 100 true octane.
50-50 mix of 110 unleaded and 92+ street gas. You are good to go with a bit of spark retard and 100-180hp shot.

You have some severe misconceptions on 400SBC's cams, converter selection and gears.

You do not want a wimpy converter stall with nitrous on this motor.
A low rpm launch on nitrous puts a lot of stress on a motor.
Get a 10" "3500 stall" at minimum for this combo on nitrous.

The XE284H-10 is a good nitrous cam. You will want short tires for N/A drag runs and taller tires 9x28 9x29" slicks for nitrous runs. Its going to MPH like crazy.

You need good valve springs with plenty of pressure so it can rev.

Everything you "hear" or have heard is BS about 400sbc's.

.

Last edited by F-BIRD'88; 03-26-2011 at 03:16 PM.
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