400 mods
New User
Joined: Aug 2004
Posts: 5
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I am looking at the paperwork and it has this:Specifications:
* Advertised duration: 282 intake/292 exhaust
* Duration at .050: 204 intake/214 exhaust
* Gross valve lift: .484 in. intake/.510 in. exhaust
* Lobe separation: 112 degrees
* RPM range: Idle to 5,500
* Designed for optimum torque from low end to the mid range. Smooth idle for daily driven vehicles.
I have a holley 650cfm on it. wow I wish I had that software. thanks alot for the help!
oh and no headers. I have 2 1/2 inch pipes, no cats, dualed out. thanks again
* Advertised duration: 282 intake/292 exhaust
* Duration at .050: 204 intake/214 exhaust
* Gross valve lift: .484 in. intake/.510 in. exhaust
* Lobe separation: 112 degrees
* RPM range: Idle to 5,500
* Designed for optimum torque from low end to the mid range. Smooth idle for daily driven vehicles.
I have a holley 650cfm on it. wow I wish I had that software. thanks alot for the help!
oh and no headers. I have 2 1/2 inch pipes, no cats, dualed out. thanks again
Thread Starter
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Freshman User
Joined: Jul 2004
Posts: 34
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what is a good combination for a carb, cam, lifters, roller rockers, pistons, and any thing eles you all can think of to put on my 400? i want at least 500 hp. alot of tourque would be nice too. i have a edlbrock manifold. i would like to stay in the 2g to 5grand price range. it is goin in a 73 gran torino that is goin to be manual.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
I simulated your setup with 58cc Ported Aussie heads and stock bore and pistons. The torque = 345 Ft-lbs@2000 RPM. Peak torque is 394@3500 RPM. Peak HP is 328 @5000 RPM. The IVC is 67 Degrees ABDC. The Dynamic Compression Ratio is 7.87:1. This should run on 91/93 Octane fuel without problems.
With Headers I get torque = 393@2000 RPM and peak torque is 430@4000 RPM. The peak HP is 372@5500 RPM.
I think that your cam could use more lift. The duration is OK.
I am using a custom Hydraulic Roller cam with 281/281 duration and 0.595/0.595 lift. I have CHI-3V aluminum heads with 64cc combustion chambers. I have flattop pistons which give me 10.35:1 CR. My torque = 425@2000 RPM and 539@4500 RPM. The HP is 540@6000 RPM. My bore is +0.030 and I have a 750 CFM Edelbrock carb and Edelbrock Streetmaster Single Plane Intake and headers. It runs on pump fuel.
This motor can be built for < $5000.00.
With Headers I get torque = 393@2000 RPM and peak torque is 430@4000 RPM. The peak HP is 372@5500 RPM.
I think that your cam could use more lift. The duration is OK.
I am using a custom Hydraulic Roller cam with 281/281 duration and 0.595/0.595 lift. I have CHI-3V aluminum heads with 64cc combustion chambers. I have flattop pistons which give me 10.35:1 CR. My torque = 425@2000 RPM and 539@4500 RPM. The HP is 540@6000 RPM. My bore is +0.030 and I have a 750 CFM Edelbrock carb and Edelbrock Streetmaster Single Plane Intake and headers. It runs on pump fuel.
This motor can be built for < $5000.00.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
My heads come from the manufacturer with guaranteed flow numbers. There is no reason to port them. I did do some port matching to the intake manifold however.
Boring + 0.030 is a safe bore. To go beyond that you need to get the cylinder walls checked for thickness. Even at +0.060 I only get to 416 cubes.
There are stroker kits available that will take a 400 up to 434. I think that these are expensive however. I think that the best bang for the dollar is the high flow rate from the CHI heads.
Boring + 0.030 is a safe bore. To go beyond that you need to get the cylinder walls checked for thickness. Even at +0.060 I only get to 416 cubes.
There are stroker kits available that will take a 400 up to 434. I think that these are expensive however. I think that the best bang for the dollar is the high flow rate from the CHI heads.
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Freshman User
Joined: Jul 2004
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the stroke kits are really expensive. i believe somewhere in the area of 3000 dollars. do u have the chi heads? and if so how much hp do you think those heads would have over a set of port and polished stock heads?
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
Zach 2004,
The CHI heads add about 70 Horsepower to a set of ported 2V heads. They also have a better chamber design that allows higher compression. The aluminum alloy also helps prevent detonation. They take 3/8" studs and guide plates for roller rockers.
aevans11,
With your current setup, you should be getting 320 ft-lbs torque @2000 RPM and 363@3500 RPM. The HP is 286@4500.
If you just add headers to your current engine you get 368ft-lbs torque @2000 RPM and 396@3500 RPM. The horsepower goes to 332@5000 RPM.
I am not a big fan of that Edelbrock Cam that you have, but it is better than stock.
The CHI heads add about 70 Horsepower to a set of ported 2V heads. They also have a better chamber design that allows higher compression. The aluminum alloy also helps prevent detonation. They take 3/8" studs and guide plates for roller rockers.
aevans11,
With your current setup, you should be getting 320 ft-lbs torque @2000 RPM and 363@3500 RPM. The HP is 286@4500.
If you just add headers to your current engine you get 368ft-lbs torque @2000 RPM and 396@3500 RPM. The horsepower goes to 332@5000 RPM.
I am not a big fan of that Edelbrock Cam that you have, but it is better than stock.
Last edited by danlee; Aug 4, 2004 at 06:40 AM.
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