How much hp
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Elder User
Joined: Oct 2001
Posts: 671
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From: virginia beach
How much hp
[updated:LAST EDITED ON 03-Feb-02 AT 05:02 PM (EST)]I have a 68 360cid 2wd f100. The truck is restored all the way around from the tires 31x15x10.5 bridgestones to the whole body witha new paintjob. The engine has about 190,000 on it. I am going to get someone to rebuild it into a 390. Right now my 360 isnt too bad but the bearings rattle at about 35 and up. Right now with my truck i can get to 60 in about 9 seconds. What can i expect to get when i rebuild my 360 into a 390. What are the bestways to increase horsepower, while building my 360 into a 390. What are you all opinions about a 0-60 time with my new 390 would be?? Your opinion is greatly appreciated.
Thanks
oh yea its a auto
Thanks
oh yea its a auto
Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
How much hp
Depends on how much you spend and how well it's done. You can easily double your horsepower by doing some basic warm-ups and converting it to a 390. Your 360 probably runs about 150 ponies bone stock, and getting 300 horsepower from a 390 is pretty easy. Check out the FE engine forum for lots of discussions about specific mods and hop-ups for your motor.
Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
How much hp
That depends. Probably not, but it may be possible if you do almost all of the work yourself and shop carefully for parts. Remember that you'll have at least $500 in machine work to do on any rebuild, plus the cost of gaskets, fasteners, and all the standard items you replace in a rebuild (pistons, water pump, oil pump, etc.). You'll have at least $250 in the cam, lifters and springs, plus another $250 for a 390 crankshaft and connecting rods. If you go all out, you can build a 450+ hp 390, but you're looking at more like two to three grand to get all that.
Don't let that discourage you. Remember that most of the cost is inherent in any rebuild, even if you kept your displacement at 360. The conversion to a 390 just adds about $250-300 in parts costs, because you have to buy the crankshaft and connecting rods to replace the ones you have. That $250-300 is money well spent.
Post this question in the FE engine forum. There are a number of guys there (dinosaurfan, ratsmoker, etc.) who know more about warming up 390s than you or I ever will.
Don't let that discourage you. Remember that most of the cost is inherent in any rebuild, even if you kept your displacement at 360. The conversion to a 390 just adds about $250-300 in parts costs, because you have to buy the crankshaft and connecting rods to replace the ones you have. That $250-300 is money well spent.
Post this question in the FE engine forum. There are a number of guys there (dinosaurfan, ratsmoker, etc.) who know more about warming up 390s than you or I ever will.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
How much hp
Stock 360 makes 215 HP while stock 390 makes 255 HP, hence it is very beneficial to have the 390 over the 360. To do a good job and to convert to a 390, you'll probably spend in the neighborhood of $1500 to $2000 and end up with ~300 HP. Add a nice aluminum intake and an aftermarket 4bbl carb and you're talking another $600+. It all depends how much you're willing (able) to spend and what you want the truck to do.
On the other hand,if you just want to rebuild your existing 360, you should be able to get all parts and machine work done for around a grand, maybe just a litle more.
On the other hand,if you just want to rebuild your existing 360, you should be able to get all parts and machine work done for around a grand, maybe just a litle more.
Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
How much hp
Not sure where your numbers are from, but I don't believe for a minute that a stock 360 makes 215 hp. What year is that, and is it gross or SAE net? My 1969 360 wasn't even rated by Ford at 215 hp gross, and Ford's ratings of the day were notoriously optimistic.
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Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
How much hp
Both the 360 and 390 HP figures are for 1968 models and come directly from numerous Ford service publications I have. These HP numbers are gross numbers that most guys (manufacturers) quote.
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Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
How much hp
You were right. Mea culpa. I checked my '69 specs, and those same figures are listed. The SAE net numbers, of course, are much lower. The data plate on my '69 F100 360 lists a net HP rating of 175. Considering the state of tune his old motor is in, 150 is probably optimistic.
I still think you can double the HP of a 360 by stroking it and adding the right performance goodies. 430 gross HP and 350 net HP out of a 390 is very possible.
I still think you can double the HP of a 360 by stroking it and adding the right performance goodies. 430 gross HP and 350 net HP out of a 390 is very possible.
Mountain Pass
Joined: Feb 2002
Posts: 132
Likes: 8
How much hp
I did a 360 to 390 conversion last summer. I am now considering a 460, although I am waiting for a response to my post about that before I decide. I can tell you that my 390 was a night and day to my 360. I forget all the specs, but I will give you a rough estimate of what I have done. Bored block to .030" over stock. Milled the stock 360 heads .005" to clean them up. Put 9.5:1 pistons. I used the camshaft that was listed for the 428. I forget the rating, but I also got all new springs so that my valves wouldn't float. The machine shop recommended the stiffness. I just forget what it is. I had new hardened valve seats put in the heads. All new valves. I used a stock cast iron 4-bbl manifold and a 600 cfm carb with vacumm secondaries. The crank was turned and all the rods were reconditioned. I also had the mains aligned bored. All the machine work cost me around $1000. That includes them assembling the heads. I spent $100 on a donor engine for the crank and rods. I don't know how much power she puts out. But I have gobs of torgue and she doesn't hesitate moving down the road or pulling through anything. I just need to due some body work now. The 390 is a good option in my opinion.
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