240 I6 conversion to 300 I6
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Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
240 I6 conversion to 300 I6
I have a friend that has a 240 I6 and burned it up, zero compression on several cyls.
I thought the only difference between the 240 and the 300 was crank (longer stroke) and probably pistons but he need new ones anyways.
Can someone tell me how to convert the 240 to a 300.
66 240 I6 C4 in a 66 mustang.
thanks, KarlJay.
I thought the only difference between the 240 and the 300 was crank (longer stroke) and probably pistons but he need new ones anyways.
Can someone tell me how to convert the 240 to a 300.
66 240 I6 C4 in a 66 mustang.
thanks, KarlJay.
Junior User
Joined: Mar 2003
Posts: 56
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From: san francisco/bay area
240 I6 conversion to 300 I6
the mustang should have the car style 240 i6 in it- integral intake, etc. the truck 240/300 is a bigger motor. it has a removable intake manifold, side plates to cover the liftrs, etc. which one do you have?
Senior User
Joined: Jul 2001
Posts: 470
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240 I6 conversion to 300 I6
If you really have a 240 in there, its the same block and everything as the 300, you just need to swap pistons, rods and crank like posted above. However, unless someone swapped that 240 in, you've most likely got a 200 which has the integral intake. If you can't remove the intake manifold, you've got the small six where none of the parts are interchangeable. If it is a small six, I believe FordSix.com boards are the best resource for you.
-=Whittey=-
-=Whittey=-
New User
Joined: Mar 2003
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240 I6 conversion to 300 I6
I swapped out the 240 in my econo P/U with a 300 found it much easier to just start with the 300 than converting the 240 over, and best of all its a direct bolt in. You can pick one up at a pull a part yard for about 100 bucks. but use the 240 head after having itchecked out.
just my $.02
Eric
just my $.02
Eric
Posting Guru
Joined: Dec 1999
Posts: 1,903
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From: Copley, OH
240 I6 conversion to 300 I6
If it is a 240 and you want to convert it to a 300, you'll need the damper pulley as wel as the crank, rods and pistons
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Junior User
Joined: Feb 2004
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Ford never put the 240 I6 in the Mustang and I doubt it would fit, since it is the big block six. You probably have the 200 I6. The intake manifold for the 240 is removable, while the intake manifold for the 200 is part of the same casting as the head.
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Laughing Gas
Joined: Oct 2003
Posts: 896
Likes: 6
The motor in your Mustang is a 200, not at all like the 240/300. The block is narrower and the bell housing is different. The oil pan has the sump in the wrong end as well as a number of other things. With enough time and money you can make anything work but this is not a bolt up swap. The reason the 240 head makes more compression on a 300 is because the compression chamber is smaller. You can get the same affect by milling a 300 head.
Senior User
Joined: Feb 2004
Posts: 227
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but are the valves the same size in the 240 and 300?
would this be a worth while performance up grade? im planing on a 4bbl, header, and bigger cam and maybe port and polish the head. but should i use a 240 or 300 head???
thanks alot
would this be a worth while performance up grade? im planing on a 4bbl, header, and bigger cam and maybe port and polish the head. but should i use a 240 or 300 head???
thanks alot
Laughing Gas
Joined: Oct 2003
Posts: 896
Likes: 6
Use the 300 head. Talk to your machine shop about what you want compression wise. A zero decked block with flat tops is going to pump your compression up quite a bit as it is. Have your block and head checked out first, see where they're at and go from there. Buying a 240 head now would be like buying pistons before you know what your overbore is going to be.