I6 to flathead swap
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Freshman User
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From: Petaluma, Ca
I6 to flathead swap
Now this may be a repetitive (maybe even stupid) question, but i need to know...can I bolt up a flathead v8 to the same bell housing that existed from the I6 that was my trucks last engine? If not, what will i need to do?
Post Fiend
Joined: May 2008
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From: Poway, Ca.
Well, actually it depends on what type of transmission you have as well. The "Bell Housing" on these is actually two peices. It's made up of the "Clutch Housing" and a "Flywheel Housing" On the 3 spd standard transmission, the clutch housing is cast into the transmission case, if you have a 3 speed heavy duty, the clutch housing is a seperate piece and bolted to the transmission (as is the case with a 4spd as well).
Chances are you will have to change out the flywheel housing, and the rest should be ok in the back. I'm not 100% sure, but I think the motor mounts differently in the front. Make sure your 239 has truck water pumps on it as those are how the engine is mounted in the front.
J!
Chances are you will have to change out the flywheel housing, and the rest should be ok in the back. I'm not 100% sure, but I think the motor mounts differently in the front. Make sure your 239 has truck water pumps on it as those are how the engine is mounted in the front.
J!
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From: Petaluma, Ca
Thanks for the info. I don't actually have the flathead yet, just really would like to find one and was wondering what installing it would entail.
I am starting with a four speed with the bolt on clutch housing so I guess it depends on what may come with the engine I find. What are some sources for different flywheel housings? Are they hard to come by?
I am starting with a four speed with the bolt on clutch housing so I guess it depends on what may come with the engine I find. What are some sources for different flywheel housings? Are they hard to come by?
Post Fiend
Joined: May 2008
Posts: 7,641
Likes: 21
From: Poway, Ca.
Thanks for the info. I don't actually have the flathead yet, just really would like to find one and was wondering what installing it would entail.
I am starting with a four speed with the bolt on clutch housing so I guess it depends on what may come with the engine I find. What are some sources for different flywheel housings? Are they hard to come by?
I am starting with a four speed with the bolt on clutch housing so I guess it depends on what may come with the engine I find. What are some sources for different flywheel housings? Are they hard to come by?
Every now and then you will see them on e-bay an dmore often than not they are selling the tranny (and what's in between) as well. And I would venture to say that someone around here has one layin'out in the front yard somewhere.
A good place to start would be with the person you get the engine from. Chances are he still has it....I'd ask.
J!
Roast em' if you got 'em
Joined: Mar 2005
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From: Rio Rancho, NM
There are a few other things to consider as well;
The radiator is different (had dual inlets and outlets for the V8) and mounts farther towards the rear, All the mounting locations are already in place in the inner fenders, etc.
The air baffle in the hood is different (wider than the I6 part) and it mounts farther back in the hood to match up with the radiator being closer to the firewall.
I think those are the main things.
This is just my opinion but I think the I6 is actually a better engine. It is rated at 5 horsepower less than the V8 and doesn't have the overheating and block cracking issues that the V8's have. I know, I know the V8 is danged sexy and sounds cool as all get out but in the long run the I6 is probably better.
Have fun with it
Bobby
I forgot, the battery box is in a different location to. On the I6 trucks its on the drivers side, the V8's is on the passenger. The throttle linkage is different as well
The radiator is different (had dual inlets and outlets for the V8) and mounts farther towards the rear, All the mounting locations are already in place in the inner fenders, etc.
The air baffle in the hood is different (wider than the I6 part) and it mounts farther back in the hood to match up with the radiator being closer to the firewall.
I think those are the main things.
This is just my opinion but I think the I6 is actually a better engine. It is rated at 5 horsepower less than the V8 and doesn't have the overheating and block cracking issues that the V8's have. I know, I know the V8 is danged sexy and sounds cool as all get out but in the long run the I6 is probably better.
Have fun with it
Bobby
I forgot, the battery box is in a different location to. On the I6 trucks its on the drivers side, the V8's is on the passenger. The throttle linkage is different as well
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From: Petaluma, Ca
Thanks for the info, my truck is a v8 truck so I think I'm all ready for the v8. I'm going to have to get a new radiator anyway, I don't have one.
The only thing I'm unsure of is the motor mounts, how are those different from the I6, front and rear. And what could be done to get some highway speed out of my stock four speed? I heard that you can swap the rear end out for a late sixties early seventies f100, but which one?
The only thing I'm unsure of is the motor mounts, how are those different from the I6, front and rear. And what could be done to get some highway speed out of my stock four speed? I heard that you can swap the rear end out for a late sixties early seventies f100, but which one?
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Post Fiend
Joined: May 2008
Posts: 7,641
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From: Poway, Ca.
There are all kinds of threads about rear end swaps and ratios. That 4spd is a granny with three normal gears. 4th is direct drive at 1.0. So you will probably need a Ford 9 inch rear end with gear somewhere in the 3.25 to 3.11 range to pu tyou at 2500rmp at 65mph.
Here's the link and in it is another link to the RPM speed calculator I like.!
https://www.ford-trucks.com/forums/7...alculator.html
In the front, the I6 has brackets/arms that bolt to the sides of the block for motor mounts. The V8 is mounted in the front by flanges on the outboard side bottom of the water pumps. In the back they are mounted by the bearing retainer which is unique to the type of transmission you have.
And as I mentioned, the flywheel covers are different (7HA-6392 for the 226 I6 and 8RT-6392 for the 239 V8 [L head]) as are the starter mounting plates.
J!
Here's the link and in it is another link to the RPM speed calculator I like.!
https://www.ford-trucks.com/forums/7...alculator.html
In the front, the I6 has brackets/arms that bolt to the sides of the block for motor mounts. The V8 is mounted in the front by flanges on the outboard side bottom of the water pumps. In the back they are mounted by the bearing retainer which is unique to the type of transmission you have.
And as I mentioned, the flywheel covers are different (7HA-6392 for the 226 I6 and 8RT-6392 for the 239 V8 [L head]) as are the starter mounting plates.
J!
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