400 rockers??
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From: Duncan,OK
400 rockers??
What is the stock rocker ratio on a 79 400?
Is there a good after market roller type replacement?
Is there a mild roller cam for this engine?
By mild I mean smooth idle lots of torque. This engine is destined for a fullsized trail rig and will do occassional towing.
I've built a lot of engines but this will be my first 400.
I may be an old hand at building, but I'm still learning a thing or two.
Thanks
Pat
Is there a good after market roller type replacement?
Is there a mild roller cam for this engine?
By mild I mean smooth idle lots of torque. This engine is destined for a fullsized trail rig and will do occassional towing.
I've built a lot of engines but this will be my first 400.
I may be an old hand at building, but I'm still learning a thing or two.
Thanks
Pat
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From: Eastern Pa
You have a couple of options but the easiest and also probably the cheapest for a rig like what your talking about are the Scorpions (EDIT- pedestal mount). No machining needed. The stock ratio is 1.73. I use them as do many others here with no problems.
Last edited by Torque1st; Jun 9, 2005 at 12:05 AM.
Laughing Gas
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From: Fairmont
Postmaster
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Posts: 4,270
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From: Delaware
There is a roller cam conversion kit made by Comp Cams. It is #31-1000. It contains the Dog Bones and the spider. You have to drill and tap two holes in the valley of the 400 block to mount it. You will also need Ford 5.0 replacement roller lifters. You will need to have your rocker pedastals removed from your heads and studs and guide plates installed. Also hardened pushrods are required.
Roller cams can supply higher ramp rates for more lift at the same duration or more reliability.
A Comp Cams 260HR is probably the right cam for your use. You could also get a custom grind with a dual pattern like a 255DEH or 265DEH in a custom ground roller or just use a flat tappet 255DEH or 265DEH cam.
What heads are you going to use?
What pistons?
What CR are you shooting for?
Roller cams can supply higher ramp rates for more lift at the same duration or more reliability.
A Comp Cams 260HR is probably the right cam for your use. You could also get a custom grind with a dual pattern like a 255DEH or 265DEH in a custom ground roller or just use a flat tappet 255DEH or 265DEH cam.
What heads are you going to use?
What pistons?
What CR are you shooting for?
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From: Duncan,OK
Right now the engine I have is from a 77 F 150. It ran very well when it was pulled from a wreck 5 years ago, and has never been open up. I figured I'd use the heads that are on it now with a little work and flat top pistons. Looking for a CR of about 8.5 or slightly higher. I have Performer intake, for a carb I'm thinking the Holley Truck Avenger. I have been looking at Cranes Power Max hyd roller cam. Not sure though, would like some thing that will come on from idle up to about 4500 rpm.
It will be going in my 79 Bronco, The motor in it now has a little over 100k on the clock. It runs good but like all those smog mills it lacks power and drinks the fuel.
I don't need a fire breathing race engine, just a few extra ponies that aren't to thirsty. I'm sure I can get there but I may have to ask a lot of ?????
I would tear in to it this weekend but I've got another project in the way.
Anyone have a set of cam bearings for a 1959 Borgward Isabella Coupe?
The things I get myself into.
Pat
It will be going in my 79 Bronco, The motor in it now has a little over 100k on the clock. It runs good but like all those smog mills it lacks power and drinks the fuel.
I don't need a fire breathing race engine, just a few extra ponies that aren't to thirsty. I'm sure I can get there but I may have to ask a lot of ?????
I would tear in to it this weekend but I've got another project in the way.
Anyone have a set of cam bearings for a 1959 Borgward Isabella Coupe?
The things I get myself into.
Pat
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Joined: Aug 2001
Posts: 4,270
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From: Delaware
I simulated a 400 (+0.03), a Crane #529721 hydraulic roller cam with stock heads, headers and a 600 CFM carb. I used 9.0:1 CR like you would get with flattop pistons.
The peak torque is 506 ft-lbs@2000 RPM. The torque falls to 427 by 4000 RPM. The Peak HP is 325@4000 RPM.
This motor has breathing problems. The heads do not supply enough air flow for the cam. Improving the head flow will help a lot.
If I use the flow figures from a CHI-3V head, the results are: Torque = 509@2000 RPM and 477 ft-lbs@4000 RPM. The peak HP is 385@5000 RPM.
A larger CFM carb only provides a small improvement.
If I go to a Crane #529731 cam with stock head flow, then I get T = 496 ft-lbs@2000 RPM, and 449 ft-lbs@4000 RPM. Peak HP = 343@4500 RPM.
With the CHI-3V head flow, I get 499 ft-lbs torque@2000 RPM and peak torque = 501 ft-lbs@3000 RPM, and 485 ft-lbs@4000 RPM. The peak HP is 403 ft-lbs@5000 RPM.
I think that the new CHI-2V heads along with a set of Tim Meyer's zero deck pistons (CR ~ 9.5:1) and a hydraulic roller cam like the Crane #529731 will make a great motor for general purpose use.
The peak torque is 506 ft-lbs@2000 RPM. The torque falls to 427 by 4000 RPM. The Peak HP is 325@4000 RPM.
This motor has breathing problems. The heads do not supply enough air flow for the cam. Improving the head flow will help a lot.
If I use the flow figures from a CHI-3V head, the results are: Torque = 509@2000 RPM and 477 ft-lbs@4000 RPM. The peak HP is 385@5000 RPM.
A larger CFM carb only provides a small improvement.
If I go to a Crane #529731 cam with stock head flow, then I get T = 496 ft-lbs@2000 RPM, and 449 ft-lbs@4000 RPM. Peak HP = 343@4500 RPM.
With the CHI-3V head flow, I get 499 ft-lbs torque@2000 RPM and peak torque = 501 ft-lbs@3000 RPM, and 485 ft-lbs@4000 RPM. The peak HP is 403 ft-lbs@5000 RPM.
I think that the new CHI-2V heads along with a set of Tim Meyer's zero deck pistons (CR ~ 9.5:1) and a hydraulic roller cam like the Crane #529731 will make a great motor for general purpose use.
Last edited by danlee; Jun 10, 2005 at 06:20 AM.
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From: Eastern Pa
I can't believe it. I had a set of those bearings on my shelf for 20 years and just threw them out last week. 
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Joined: Dec 2004
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From: Duncan,OK
Thanks for the numbers. I'll be puting a lot of study into this one, Being that there's no rush since the engine in the truck runs fine. So I may be bending your ear a lot on this.
Thanks again
Pat
Thanks again
Pat
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