Not sure if I should have posted this in the SBC section or not, but here it is.

So, I'm building a sbc 406. I'm looking to get 425 hp/500 ft.lbs of torque out of it. Revving to 5500-6000 MAX, maybe only 5500. I believe I will achieve that with these parts... tell me what you think

4.155" bore (.030) over
3.75" stroke
Speedpro +12.5cc dish pistons
Stock 5.565 chevy 400 rods
Eagle Cast steel crank
Stock Vortec heads 062 casting (64cc chambers)
Vortec Edelbrock Performer RPM Air Gap
Assuming .052-.065" quench depending on how far down the piston is
LS3 springs with Comp cam 787 retainers
Holley 750 double pumper
1 5/8" Long tube headers

Howards Cam:

Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:2,000-6,400
Intake Duration at 050 inch Lift:231
Exhaust Duration at 050 inch Lift:241
Duration at 050 inch Lift:231 int./241 exh.
Advertised Intake Duration:285
Advertised Exhaust Duration:295
Advertised Duration:285 int./295 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.470 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.470 in.
Valve Lift with Factory Rocker Arm Ratio:0.470 int./0.470 exh.
Lobe Separation (degrees):108
Camshaft Gear Attachment:3-bolt

Running 91 octane gas.

Static Compression will be 10.1:1 - 10.5:1
Dynamic Compression will be 7.81:1-8.03:1

Its going in a 69 camaro with a muncie 4 speed and 3.08 rear gear (for now). I'm hoping for killer low-midrange torque.

 

nice engine and a nice car .

where did you get the 69 Camaro from? for how much?

what engine, transmission and rear end does it have?

is it in a good condition?

thanks.

 

I said above its a muncie 4 speed with 3.08 rear gears.

 

"I'm looking to get 425 hp/500 ft.lbs of torque out of it."

Is that on a chasis dyno or an engine dyno?

 

That would be an engine dyno, my goal is 425 FLYWHEEL horsepower.

 

You're probably close to that. The Vortec heads might not get it done.

 

I think you'll get to your goal with that setup. That cam is quite mild for a 400.

 

Yea I wanted a milder cam since its a street car and I wanted more engine vacuum. I chose a 108 LSA because I wanted more of a choppy idle and figured I'm only revving 5500rpm so the extra low end torque would be nice.

 

I agree. You should be able to achieve your goals.

 

So I just found out today that my pistons are .022" down the hole. So with a fel pro headgasket at .039" this puts my finally compression ratio at 10.24:1, and my DCR at 7.87:1. The quench isn't ideal at .061", but I figure with my vortec heads I can get away with running 91 octane on this engine without it pinging. What do you guys think?

 

Tightening up the quench makes an engine less octane sensitive. I'd for sure
try to find a 4.160" Cometic or Fel Pro MLS head gasket that measures .027"
for a still less than ideal but much better .049" quench. BTW those heads
won't need any more than 32 degrees of total timing advance.

 

390-410hp at 5200rpm 475-485tq @ 4400rpm

 

http://www.carcraft.com/techarticles...l_block_chevy/

http://www.chevyhiperformance.com/te..._engine_build/

 

I think the torque will be there but the power may be a little tuff to get to .... I had a 406 with similar parts, major differance was I had a single plane intake and Iron eagle heads it only made 310 at the wheels....

A few things I see the headers, cam and heads will keep you from making the power...but you are creating quite the torque monster...

As for the article theres a lot to consider they were using the large port bowtie heads which are considerably larger than a standard vortec although both will flow better on the 4.155 bore. They used a larger cam with 1.6 rockers and used a better rod/piston combonation with good balancing and a fairly large spacer and add that they dynoed with no alternator and electric pump.... and neted 466

I would say you will be more than likely in the neiborhood of 375 flywheel ~ 300 at the wheel with the muncie