390 Crankshaft
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Good job ! I have a special place in my heart for the FE motors my first Ford truck had a 390 4 barrel and it was the 1st motor I ever built 
and I still run a 390 in one of my 1976 highboys but when fuel went above $3.50 a gal. for 87 octane I started playing with the 300 six motor .. I have had for a number of years a 300 that I run on propane for a stationary electrical backup generator ..
Here's some 300's in F100's to listen to
and I still run a 390 in one of my 1976 highboys but when fuel went above $3.50 a gal. for 87 octane I started playing with the 300 six motor .. I have had for a number of years a 300 that I run on propane for a stationary electrical backup generator ..Here's some 300's in F100's to listen to
Posting Guru
Joined: Jul 2013
Posts: 1,685
Likes: 2
From: Oregon
Mckoloum I'm looking forward to your project. I suggest you do what you've been wanting to for a long time and build the 390. An American V8 sings a sweet tune that no straight six can replicate. I'm not bashing the six because it's a good motor just saying you can't help wanting what you want. Good luck bud.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Mckoloum I'm looking forward to your project. I suggest you do what you've been wanting to for a long time and build the 390. An American V8 sings a sweet tune that no straight six can replicate. I'm not bashing the six because it's a good motor just saying you can't help wanting what you want. Good luck bud.
unless you get both
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
There is an option for an "off-the-shelf" 5 speed, but it's not cheap.
New Process (Chrysler) and Muncie (GM) formed New Venture Gear in the early 90's, and made several 5 speed truck transmissions that found their way into both GM and Dodge pickups.
The most common, is the NV4500. As one of the few 5 speed truck transmissions ever built (for a production truck) with a separate bellhousing, it can be adapted to fit nearly any engine, in 2wd or 4wd configuration. This is accomplished with either a custom bellhousing, or a spacer/adapter to bolt the NV trans to the stock bellhousing.
The NV4500 is a rather robust trans, as the HD version was used in Dodge trucks behind both the V10 and Cummins diesel. However, they do have one weakness, the nut holding the 5th gear on the back of the mainshaft can back off, and if this happens, the gears can be damaged, and 5th gear can become unusable. There are fixes for this issue, so they should be considered if one decides to try this conversion.
Link to one (of many) sites that offer info on conversions. It specifically mentions the FE about 1/2 down the page.
New Page 1
New Process (Chrysler) and Muncie (GM) formed New Venture Gear in the early 90's, and made several 5 speed truck transmissions that found their way into both GM and Dodge pickups.
The most common, is the NV4500. As one of the few 5 speed truck transmissions ever built (for a production truck) with a separate bellhousing, it can be adapted to fit nearly any engine, in 2wd or 4wd configuration. This is accomplished with either a custom bellhousing, or a spacer/adapter to bolt the NV trans to the stock bellhousing.
The NV4500 is a rather robust trans, as the HD version was used in Dodge trucks behind both the V10 and Cummins diesel. However, they do have one weakness, the nut holding the 5th gear on the back of the mainshaft can back off, and if this happens, the gears can be damaged, and 5th gear can become unusable. There are fixes for this issue, so they should be considered if one decides to try this conversion.
Link to one (of many) sites that offer info on conversions. It specifically mentions the FE about 1/2 down the page.
New Page 1
Thread Starter
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Senior User
Joined: May 2014
Posts: 165
Likes: 0
From: Sunny Florida
You are right Blue,
I know it is going to hurt my wallet with the MPG but for me the V8 is a part of the American history! When you are a kid and you see all those movies like Bullit, Two Lane Blacktop or Vanishing Point, like me you need to have a V8.
I had a 1995 Bronco, with the 5.8L. engine, it was my daily driver and it really hurt me driving 45 miles/day! Now I missed it...
I know it is going to hurt my wallet with the MPG but for me the V8 is a part of the American history! When you are a kid and you see all those movies like Bullit, Two Lane Blacktop or Vanishing Point, like me you need to have a V8.
I had a 1995 Bronco, with the 5.8L. engine, it was my daily driver and it really hurt me driving 45 miles/day! Now I missed it...
Thread Starter
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Senior User
Joined: May 2014
Posts: 165
Likes: 0
From: Sunny Florida
Thanks Mike,
I am in the West Palm Beach area.
You are right I find some help in here really quick, it help a lot to have all of you guys ready to share your knowledge, Thanks to all of you.
I am in the West Palm Beach area.
You are right I find some help in here really quick, it help a lot to have all of you guys ready to share your knowledge, Thanks to all of you.
Thread Starter
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Senior User
Joined: May 2014
Posts: 165
Likes: 0
From: Sunny Florida
Thanks for the info Rogue,
I just looked at the link, this will be a nice modification.
My budget is really low, trying to keep the cost as low as I can, I might stick with my 3 speed for now.
I also read you can improve the mileage by putting the right part in the engine, what you guys think will be best combination, for low budget!
I just looked at the link, this will be a nice modification.
My budget is really low, trying to keep the cost as low as I can, I might stick with my 3 speed for now.
I also read you can improve the mileage by putting the right part in the engine, what you guys think will be best combination, for low budget!
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Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
The FE motor is the most expensive of Ford motors to rebuild but it was worth it to me .. You will have to decide whether your budget can hold up ..
For example on a budget but still wanting the motor to perform I might choose these heads http://www.ebay.com/itm/Ford-Heads-390-428-GT-6-B-14-6-B15-C6AE-6090-R-/191189063008?hash=item2c83c19560&item=191189063008&pt=Motors_Automotive_Tools&vxp=mtr
Do you want it to be able to use 87 octane fuel?
Do you have kids ?
For example on a budget but still wanting the motor to perform I might choose these heads http://www.ebay.com/itm/Ford-Heads-390-428-GT-6-B-14-6-B15-C6AE-6090-R-/191189063008?hash=item2c83c19560&item=191189063008&pt=Motors_Automotive_Tools&vxp=mtr
Do you want it to be able to use 87 octane fuel?
Do you have kids ?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
That said, building a 390 with ~9.5:1 CR and a mild-ish cam (like comp H268) can net better MPG than a stock (dog) 360/390. This obviously requires driving with a bit of throttle restraint........
Easy way to get that CR range, is use stock 360 pistons (in the correct overbore as needed) on 390 rods/crank. The 360 used a piston that was originally built for the 390, but since it stopped more .100 away from the head, the CR (in the 360) was in the low 8:1 range. The same piston on 390 rod/crank, gives 9.3-10:1 CR depending on head CC.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
There's not much you do to improve the MPG with an FE. But, there's also not much you can do to hurt the MPG either, so you might as well make it run good.
That said, building a 390 with ~9.5:1 CR and a mild-ish cam (like comp H268) can net better MPG than a stock (dog) 360/390. This obviously requires driving with a bit of throttle restraint........
Easy way to get that CR range, is use stock 360 pistons (in the correct overbore as needed) on 390 rods/crank. The 360 used a piston that was originally built for the 390, but since it stopped more .100 away from the head, the CR (in the 360) was in the low 8:1 range. The same piston on 390 rod/crank, gives 9.3-10:1 CR depending on head CC.
That said, building a 390 with ~9.5:1 CR and a mild-ish cam (like comp H268) can net better MPG than a stock (dog) 360/390. This obviously requires driving with a bit of throttle restraint........
Easy way to get that CR range, is use stock 360 pistons (in the correct overbore as needed) on 390 rods/crank. The 360 used a piston that was originally built for the 390, but since it stopped more .100 away from the head, the CR (in the 360) was in the low 8:1 range. The same piston on 390 rod/crank, gives 9.3-10:1 CR depending on head CC.
I'd go with 9.0:1 max
Thread Starter
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Senior User
Joined: May 2014
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From: Sunny Florida
Redroad, funny you show me this link, I saw those but the description said it will not fit the 8 bolt manifold without drilling 4 new holes? And those are with the CJ valve.
Does having the CJ valve or stock valve will change anything in MPG?
No I don't have kid, why?
Being able to put 87 will be a nice thing.
Rogue if I understand I should stay below the 9.5:1 compression ratio. And the compression ratio is one of those thing I can't figure out yet, I understand the CC from the head and cylinder chamber play a role in it, but does the camshaft have an incidence on the CR?
Does having the CJ valve or stock valve will change anything in MPG?
No I don't have kid, why?
Being able to put 87 will be a nice thing.
Rogue if I understand I should stay below the 9.5:1 compression ratio. And the compression ratio is one of those thing I can't figure out yet, I understand the CC from the head and cylinder chamber play a role in it, but does the camshaft have an incidence on the CR?
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
Redroad, funny you show me this link, I saw those but the description said it will not fit the 8 bolt manifold without drilling 4 new holes? And those are with the CJ valve.
Does having the CJ valve or stock valve will change anything in MPG?
No I don't have kid, why?
Being able to put 87 will be a nice thing.
Rogue if I understand I should stay below the 9.5:1 compression ratio. And the compression ratio is one of those thing I can't figure out yet, I understand the CC from the head and cylinder chamber play a role in it, but does the camshaft have an incidence on the CR?
Does having the CJ valve or stock valve will change anything in MPG?
No I don't have kid, why?
Being able to put 87 will be a nice thing.
Rogue if I understand I should stay below the 9.5:1 compression ratio. And the compression ratio is one of those thing I can't figure out yet, I understand the CC from the head and cylinder chamber play a role in it, but does the camshaft have an incidence on the CR?
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
The 74 I have, has a 390 with 360 pistons, a factory 390GT/428CJ camshaft, with D2 heads (9.3-9.5:1 CR), and it runs fine on 87 octane with the timing set a couple degrees back from optimal. Optimal timing, it prefers 89 octane, but can still handle the cheaper stuff. It's been this way since Dad built the engine some 25 years ago...... About 3 years before my youngest kid was born.
Lead Driver
Joined: Nov 2006
Posts: 5,217
Likes: 506
From: Pa.
With proper ignition timing, you can still run 87 octane in a 390 with 9.5:1 CR. Of course, much higher than that, and 91 can become required.
The 74 I have, has a 390 with 360 pistons, a factory 390GT/428CJ camshaft, with D2 heads (9.3-9.5:1 CR), and it runs fine on 87 octane with the timing set a couple degrees back from optimal. Optimal timing, it prefers 89 octane, but can still handle the cheaper stuff. It's been this way since Dad built the engine some 25 years ago...... About 3 years before my youngest kid was born.
The 74 I have, has a 390 with 360 pistons, a factory 390GT/428CJ camshaft, with D2 heads (9.3-9.5:1 CR), and it runs fine on 87 octane with the timing set a couple degrees back from optimal. Optimal timing, it prefers 89 octane, but can still handle the cheaper stuff. It's been this way since Dad built the engine some 25 years ago...... About 3 years before my youngest kid was born.