Thread: 400 small block build for 69 camaro. Anyone with desktop dyno?

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So here's the 400 I'm building right now. Haven't finished it yet but it's getting close. For the most part a budget build. Should be REAL torquey!!! Here's the specs...


short block: 400CID
400 small block chevy 4.125" stock bore
stock dish pistons with new rings
stock 5.565" rods
stock 3.75" stroke crank
9:1 compression

Heads:
Fuelie Corvette heads 461's. 2.02 1.6 valves. Pocket ported. Estimated at 225cfm at .500 lift. Use your best judgment on flow numbers, the heads have not been ported just yet. Estimated 75% Exhaust/Intake flow ratio. 64cc combustion chambers.

Camshaft: Hydraulic flat tappet
Lunati Voodoo part#60102
Advertised dur. 262 intake 268 exhaust
Duration @ .050 219 IN. 227 EX.
Lift: .515 Intake, .538 Exhaust (with 1.65 roller rockers)
LSA is on 112
I believe this cam timing is taken at .050"...
Intake opens 1.5 degrees BTDC
Intake closes 37.5 degrees ABDC
Exhaust opens 49.5 degrees BBDC
Exhaust closes -2.5 degrees ATDC

Weiand Stealth dual plane intake manifold

Hooker 1 3/4 inch headers

750cfm Holley vacuum secondary carburator



Did I forget anything?...Thanks for any replies ahead of time...

You might try www.virtualengine2000.com Something to play with.Accuracy???????

Well I would like to buy one of the desktop dyno programs in the near future. But since I'm only working parttime right now, the car parts come before my curiosity of what the motor is actually going to put out...I was just hoping someone else would have the curiosity to what something like this would put out also...Thanks for the site though, it looks like they have some pretty good simulations.

Anyone have any ideas on the output of this motor? I'm hoping it will put out close to 400 horses with even more torque...I would have bought 1 5/8" headers instead of the 1 3/4" but I expect to go with better heads and the longer connecting rods etc. later on down the road. So I will take a loss in torque for now... but I think since it's a 400 the bigger headers shouldn't have too much of a loss though.

I am getting about 455 horse and 425 torque on my dyno program. These programs run a bit high in my opinion by about 15 to 25 horse, but who knows?

Hmmm that doesn't sound quite right. I would expect higher torque numbers because of the smaller cam? Maybe 425 horse 455 torque? What RPM did the horsepower peak at?

Sorry about that, I was color blind at that particular moment. I reran it and at first run I read it backwards, here is a pic of the graph.

Originally Posted by mooneye777

I am getting about 455 horse and 425 torque on my dyno program. These programs run a bit high in my opinion by about 15 to 25 horse, but who knows?

I agree;I have a similiar set up on my 406 SBC. It checked 425 hp,428 torque at 6200 rpm.I hope to verify with a true dyno test soon.It's not an issue as I only run the streets,with the desk top it gives you an idea,which is exciting.

Very nice torque curve...over 400lbs of torque from 2000-5500rpm. 425HP at a fairly low 5500rpm, which is probably still a little high with the stock rod length. That will probably be the highest I rev the motor. I'll definately be getting a rev limiter for this motor.

Thanks for running that mooneye.