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Old 06-19-2017, 11:22 AM
varminthunter243 varminthunter243 is offline
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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 offline
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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 offline
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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 06-22-2017, 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 06-22-2017, 11:19 AM
varminthunter243 varminthunter243 is offline
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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.
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 06-22-2017, 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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Old 06-22-2017, 11:01 PM
varminthunter243 varminthunter243 is offline
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As my daily driver, that was a little too steep. Any highway driving sounded like a NASCAR race. But the steep torque curve was awesome. Now that 60 is about the fastest it'll see, I think the 4.11's will be perfect. Still debating whether or not the Detroit will go in the rear.......the auburn in the front is a game changer.
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Old 06-23-2017, 12:03 PM
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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.
The cam, 9.0:1 pistons, and working the heads over made a HUGE difference the last time we did this motor. It was still running well but oil consumption was getting ridiculous. People thought it had a 12 valve in it the way it smoked. Tore it apart and found the notorious valve guide issue. As long as we had it apart we figured my high school graduation present would be putting some fun parts in it. We went back in with the aftermarket valve guides to help keep the wear down too. After that it's a different animal. When it was my daily I had a hard time paying for 8 mpg so we put the stock 2 bbl set up on it to try to save fuel. Went to a whopping 10 mpg haha now it will be resurrected as a true monster........ I think 4 bbl Cleveland heads and a thumpr may even be in the distant future. Time will tell. I miss the beast
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Old 06-23-2017, 06:04 PM
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The ports on the 4V heads are too big for a low/mid range torque machine IMHO. Look up Aussie 302C heads. Those are what you are looking for if you have money burning a hole in your pocket.
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Old 06-25-2017, 10:48 PM
varminthunter243 varminthunter243 is offline
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The ports on the 4V heads are too big for a low/mid range torque machine IMHO. Look up Aussie 302C heads. Those are what you are looking for if you have money burning a hole in your pocket.
i wish i had money burning a hole ANYWHERE haha we are actually very near completing the process of buying a house with enough land for a shop large enough to put the beast in. So for now, we're probably looking at spring next year having the truck running with hopefully the performer manifold and 600 holley (from the information I've gathered this far in the thread). A head/cam change would be a couple years off it even happens at all. But with all the hype around the 2020 bronco and this new property with room for a shop, I couldn't help but get the ball rolling on parts suggestions. I've spent alot of time on the 99-03 7.3 forum and some on the super duty forum. It never stops amazing me the wealth of knowledge fte has to offer, and I'm very thankful for the help!
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Old 06-25-2017, 11:05 PM
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What do you guys recommend for a 400M...
No such thing as a 400M, it's just plain ol' 400. The only M is the 351M
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Old 06-27-2017, 09:17 AM
varminthunter243 varminthunter243 is offline
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After researching carbs and intakes on this motor, I am now painfully aware of that haha every YouTube video, forum thread, comment, or inscription in a truckstop bathroom stall that refers to this motor as a 400"M" received no less than a hundred corrections haha but I have now seen the light and will vow to never refer to it as a 400 M again. Thank you! Lol
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