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Old 06-19-2017, 11:22 AM
varminthunter243 varminthunter243 is online now
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What parts?

Well, after 5 years of hibernation, the time is fast approaching to begin the task of bringing the green beast back to life. Shortly before I parked it, I put the factory intake and 2 barrel carb back on. Now that the truck will no longer see daily driver duty, I plan to include a new intake manifold and 4 barrel on. What do you guys recommend for a 400M with an RV stick, heads that have been opened up a bit, slightly higher compression, forged bottom end, that will give me the best in low-mid range torque? I can't remember the set up I had previously. It was sold not long after it came off.
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Old 06-19-2017, 12:55 PM
Redark1 Redark1 is offline
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Edlebrock performer dual plane.
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Old 06-19-2017, 06:08 PM
varminthunter243 varminthunter243 is online now
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That was the one I really liked. Any recommendations on a carb? Summit only listed one for this engine, a 600 holley. Not sure what kind of fuel flow I should look for......
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Old 06-20-2017, 07:47 AM
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I had the Edelbrock Performer on my old 1978 F150 w/400 & C6 years ago. I also had their cam kit. The truck was a strong runner. 27 years later it is still going, my neighbor owns it.

I had a Edelbrock 600 on the truck when I first built it. I had the tuning kit and it always had a flat spot just off idle no matter how much I fiddled with it. The next owner put a 600 Holley on it, problem solved. 600 CFM is plenty of carb. for your project.

As far as fuel flow goes, forget the stock fuel pump. It will not flow near enough. I used an inline carter electric fuel pump with no issues (bypassed the stock pump). In this day and age I highly suggest an oil pressure switch to activate/deactivate the pump. You might still be able to find a hi-flow mechanical pump for that engine to eliminate that problem. Back in the day the electric pump was much cheaper than the hi-flow mechanical.
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Old 06-20-2017, 09:11 PM
varminthunter243 varminthunter243 is online now
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Originally Posted by rla2005 View Post
I had the Edelbrock Performer on my old 1978 F150 w/400 & C6 years ago. I also had their cam kit. The truck was a strong runner. 27 years later it is still going, my neighbor owns it.

I had a Edelbrock 600 on the truck when I first built it. I had the tuning kit and it always had a flat spot just off idle no matter how much I fiddled with it. The next owner put a 600 Holley on it, problem solved. 600 CFM is plenty of carb. for your project.

As far as fuel flow goes, forget the stock fuel pump. It will not flow near enough. I used an inline carter electric fuel pump with no issues (bypassed the stock pump). In this day and age I highly suggest an oil pressure switch to activate/deactivate the pump. You might still be able to find a hi-flow mechanical pump for that engine to eliminate that problem. Back in the day the electric pump was much cheaper than the hi-flow mechanical.
It's actually got an electric fuel pump on it already. It's wired to the ignition switch and we did away with the mechanical when we did this motor. Anything else you would recommend while I'm digging around in there?
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Old Today, 10:12 AM
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My old 1978 F150 ran well with the Edlebrock cam/manifold/carb. combination and electric fuel pump. Other than the off-idle stumble (later resolved with a different carb.) it ran very well. I also had the transmission rebuilt and beefed up a bit. Nice firm shifts.

The only other factors to consider are the gear ratios and tire size. Taller tires require shorter gears. My F150 had 3.55 gears and I used ~29" tall tires. I never had a problem moving the world. Once you start going past 31" or more you should consider a gear change, especially if the gears are taller than 3.55.
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Old Today, 11:19 AM
varminthunter243 varminthunter243 is online now
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Originally Posted by rla2005 View Post
My old 1978 F150 ran well with the Edlebrock cam/manifold/carb. combination and electric fuel pump. Other than the off-idle stumble (later resolved with a different carb.) it ran very well. I also had the transmission rebuilt and beefed up a bit. Nice firm shifts.

The only other factors to consider are the gear ratios and tire size. Taller tires require shorter gears. My F150 had 3.55 gears and I used ~29" tall tires. I never had a problem moving the world. Once you start going past 31" or more you should consider a gear change, especially if the gears are taller than 3.55.
It's wearing 32x11.50's now. It's got 4.11's too with 31 spline axles. But with my powerstroke being my daily driver, I'm looking for a much steeper torque curve and power concentrated in low-mid range where it seems these motors tend to excel. It will be a dedicated fun/hunting truck now. With hopefully a small lift and slightly bigger tires in its future. Nothing stupid, just possibly 2" or so and 34's.
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Old Today, 11:30 AM
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The 4.11's are reasonable for the intended use IMHO. I loved the 400 in my old truck. It really responded to the cam and intake change.
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