More power from a 400
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Senior User
Joined: Dec 2003
Posts: 150
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From: Aiken SC
More power from a 400
I want to get some more horsepower and torque from my 400. It's in a 79 f-150 4wd automatic. I really don't want to mess with the heads right now. What I really want is to install a cam and some roller rockers. What would be a good setup.
Elder User
Joined: Jan 2004
Posts: 887
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From: Colorado
If you want to install a new cam and roller rockers, do a forum search for this information. Its easy, just go to the top right of the screen and type in youre search parameters. Sometimes it is easier to find information if it already exists than it is to try and pull it out of someone again. Good luck, and keep us updated on what you decide. There is alot of helpful information here.
---JOHN
---JOHN
Senior User
Joined: Aug 2003
Posts: 304
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From: Billings, Montana
If you choose roller rockers you will need to go with a roller cam dont you?
To get more power all you need is some flat top pistons, decent cam, double roller timing set and a good ignition box. That will give you a very stong running motor that is something to be proud of but not over the top to where you can't drive it. But then again with gas prices so dang high, you might not want to drive it.
To get more power all you need is some flat top pistons, decent cam, double roller timing set and a good ignition box. That will give you a very stong running motor that is something to be proud of but not over the top to where you can't drive it. But then again with gas prices so dang high, you might not want to drive it.
Posting Guru
Joined: Aug 2000
Posts: 1,127
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From: (near) Denver USA
Roller rockers are a direct replacement for the conventional sled-type rockers, just using a more efficient fulcrum design.
Roller cams require roller lifters. The lobe profiles are designed to work with roller lifters to provide different valve opening and closing characteristics (typically faster than flat tappet cams), and the lobes are completely flat across their surfaces (rather than tapered) to work with roller lifters. Also, the camshaft stock material and lobe surface hardening treatment is designed to work with roller lifters instead of flat lifters.
You can use either roller rockers or sled-type rockers with a roller cam.
BTW, all US-market Ford pushrod engines with factory roller cams (i.e., '85-up 5.0 HO and '94-up 351W) used sled-type rockers.
Roller cams require roller lifters. The lobe profiles are designed to work with roller lifters to provide different valve opening and closing characteristics (typically faster than flat tappet cams), and the lobes are completely flat across their surfaces (rather than tapered) to work with roller lifters. Also, the camshaft stock material and lobe surface hardening treatment is designed to work with roller lifters instead of flat lifters.
You can use either roller rockers or sled-type rockers with a roller cam.
BTW, all US-market Ford pushrod engines with factory roller cams (i.e., '85-up 5.0 HO and '94-up 351W) used sled-type rockers.
