from a 318 to a 440

beep beep 73 · 06-15-2007, 07:48 PM

I have a 1973 Road Runner which has a 318 in it. I came across a 440 and want to put it in. Actually I have already got the 318 out and ready to put the 440 in.

My question is does anybody know what modifications I will have to do before I can put the 440 in?

ANY advice or input from anyone would be greatly appreciated.
Specific modifications would be really great if anyone knows them.

Thanks a million

ucfierocharger · 06-28-2007, 10:46 PM

Actually I am in the process of doing the exact same thing. Here is a link to where my thread is on the charger forum. It will be the same basic concept. I have a 73 charger.

So far i know this

I <donno if it will be the same for you, but probably VERY close> need to:

make sure i have the 8 3/4 inch rear end or better

bigger than 9" drum brakes in the back and the disks in the front are good enough

New mounts
New wiring harness
Typical Engine rebuild parts

Oh and your small block tranny wont bolt to the 440 I do not believe. And im also pretty sure that since the 440 is externally balanced and the 318 internally something needs done with that, but im not sure right off hand.

If you have found any other information about the swap I would love to know about it, like I said I am doing it as well.

440roadrunner · 11-09-2007, 07:45 PM

You'll need big block motor mounts for your year of car, including the engine brackets and the rubber mounts0--separate pieces

You'll need the proper big block transmission--SB and big block patterns are different.

I don't know about the rear trans mount

You might have to switch the lower radiator outlet to the opposite side, and the radiator might not be big enough.

Power steering brackets, etc, misc

Depending on what transmission you find (tailshaft length) you might have to make a new driveshaft, or shorten yours.

It would be FAR easier to put a 340/360 in that car, pretty much a bolt in.

Depending on what the 440 is out of (a truck?) the manifolds might be troublesome, unless you plan headers, ditto with the pan. I'm sure your car still uses a front sump pan.

Torsten · 01-09-2008, 07:15 AM

hi,torsionbars 960" diameter insert. greets torsten

44072Charger · 03-19-2008, 03:00 PM

the 440 is pretty easy. Need a radiator with opposite outlets than the smallblock, wiring is the same (extend temp. sensor wire), mounts, tranny mount is the same, shorten driveshaft a hair, need BB 727 tranny, center sump pan

06-15-2007, 07:48 PM	#1 (permalink)
beep beep 73 Junior Member Join Date: Jun 2007 Posts: 1	from a 318 to a 440 I have a 1973 Road Runner which has a 318 in it. I came across a 440 and want to put it in. Actually I have already got the 318 out and ready to put the 440 in. My question is does anybody know what modifications I will have to do before I can put the 440 in? ANY advice or input from anyone would be greatly appreciated. Specific modifications would be really great if anyone knows them. Thanks a million

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06-28-2007, 10:46 PM	#2 (permalink)
ucfierocharger USB car drive man Join Date: Jun 2007 Location: Cincinnati OH Posts: 139	Actually I am in the process of doing the exact same thing. Here is a link to where my thread is on the charger forum. It will be the same basic concept. I have a 73 charger. So far i know this I <donno if it will be the same for you, but probably VERY close> need to: make sure i have the 8 3/4 inch rear end or better bigger than 9" drum brakes in the back and the disks in the front are good enough New mounts New wiring harness Typical Engine rebuild parts Oh and your small block tranny wont bolt to the 440 I do not believe. And im also pretty sure that since the 440 is externally balanced and the 318 internally something needs done with that, but im not sure right off hand. If you have found any other information about the swap I would love to know about it, like I said I am doing it as well.

11-09-2007, 07:45 PM	#3 (permalink)
440roadrunner Senior Member Join Date: Nov 2007 Posts: 272	You'll need big block motor mounts for your year of car, including the engine brackets and the rubber mounts0--separate pieces You'll need the proper big block transmission--SB and big block patterns are different. I don't know about the rear trans mount You might have to switch the lower radiator outlet to the opposite side, and the radiator might not be big enough. Power steering brackets, etc, misc Depending on what transmission you find (tailshaft length) you might have to make a new driveshaft, or shorten yours. It would be FAR easier to put a 340/360 in that car, pretty much a bolt in. Depending on what the 440 is out of (a truck?) the manifolds might be troublesome, unless you plan headers, ditto with the pan. I'm sure your car still uses a front sump pan.

01-09-2008, 07:15 AM	#4 (permalink)
Torsten Junior Member Join Date: Jan 2008 Posts: 5	hi,torsionbars 960" diameter insert. greets torsten

03-19-2008, 03:00 PM	#5 (permalink)
44072Charger Junior Member Join Date: Mar 2008 Posts: 11	the 440 is pretty easy. Need a radiator with opposite outlets than the smallblock, wiring is the same (extend temp. sensor wire), mounts, tranny mount is the same, shorten driveshaft a hair, need BB 727 tranny, center sump pan