240 or 300????
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Lead Driver
Joined: Feb 2000
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From: Palm Bay, Florida
240 or 300????
I've got a 1970 Econoline van with a I6 engine, I'm not real familiar with the Ford Truck 6s, can anyone please tell me how I can identify which engine I have, which may not be the original?
Thanks!! -Supercab
Thanks!! -Supercab
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Joined: Sep 2001
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240 or 300????
If it is the same as original, a 240 is engine code "A" a 300 is code "B" on your door post and in the VIN number. Other than the internal shape of the combustion chamber and the length of the stroke, I'm not sure there is a difference. Look under the edge of driverside front lip of the head casting and you will see a casting number, it should be D0A?-? for a 1970. (You will need an inspection mirror to do this) If the first 2 are D0 you at least know the head is from 1970. Then look at the block under the passenger side motor mount. There is a circle with 1,3,5,7,9 cast in it. There also is an arrow that should, in your case point between the 9 and 1. I know these casting marks are hard to see, but that should give you an idea of if the engine is the original or not. Actually IF you can read all 5 letters and digits of the number on the head, you can figure out if the head was cast for a 240 or a 300. Herman
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Joined: Nov 1999
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240 or 300????
Another, cruder method:
1. Pull the coil wire so the engine won't fire up!
2. Pull the spark plug from whichever cylinder is easiest for you to access;
3. Rotate engine to bring that piston to TDC;
4. Straighten out a wire coat hanger, stick it in the spark plug hole so it touches the piston top;
5. Rotate engine so that piston's at BDC;
6. Lower the hanger so it still touches the piston;
7. Measure the distance the piston traveled on the wire. A 300 has a 3.98" (roughly, 4-inch) stroke; the 240, a 3.18" (roughly, 3-3/16") stroke.
Eddie
1. Pull the coil wire so the engine won't fire up!
2. Pull the spark plug from whichever cylinder is easiest for you to access;
3. Rotate engine to bring that piston to TDC;
4. Straighten out a wire coat hanger, stick it in the spark plug hole so it touches the piston top;
5. Rotate engine so that piston's at BDC;
6. Lower the hanger so it still touches the piston;
7. Measure the distance the piston traveled on the wire. A 300 has a 3.98" (roughly, 4-inch) stroke; the 240, a 3.18" (roughly, 3-3/16") stroke.
Eddie
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