300 vs 240
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
To tell them apart, look at your cranshaft pully, if its a 2 groove unit (only can have 2 belts) then you more than likely have a 240. Another easy way to check is to get a dowel or stiff wire and rotate the engine through a full cycle with the dowel/wire down the sparkplug hole on any cylinder. Mark it at the high spot, and low spot. Now i've just got to dig up the stroke specs on these engines to tell you the difference.
I belive all or virtually all parts between the 240 and 300 are interchangeable. I know for certain the heads are interchangeable between the two. Blocks will interchange...and a few others. I'm not certain about internal parts...but i'm sure some if not most of those will interchange also.
I belive all or virtually all parts between the 240 and 300 are interchangeable. I know for certain the heads are interchangeable between the two. Blocks will interchange...and a few others. I'm not certain about internal parts...but i'm sure some if not most of those will interchange also.
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New User
Joined: Aug 2005
Posts: 16
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From: cherry point nc
id never thought of that checking the stroke. the 300 has a stroke of 3.98 for a 1970. i doubt year would make a difference, but it may. i dont know much about these motors. put me infront of a jet engine though, and im golden
Senior User
Joined: Sep 2003
Posts: 497
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From: Houston TX
Yea, the pully thing is pretty accurate... Usually...A few
exceptions, but not many... Also the stroke of the 240 is
almost an inch less than the 300. I don't have my book,
but seems like the 240 is maybe 3.18 ?? or so, vs the 3.98
of the 300. Many people like to stick 240 heads on 300's
to get more compression. I've got one of each.
I gotta 68 F-250 with a 300, and a 74 F-100 with a 240.
I can tell the difference between the two just by sound
and feel when driving... The 240 revs about 4k higher
than the 300. A bit less torque at low rpms...
The 300 has a fairly "truckish" feel to it, with the sound,
low rpms, long stroke,etc... The 240 almost feels like a "big car" six, it's so smooth from the shorter stroke.
In fact, the 240 was used in a few galaxies...
MK
exceptions, but not many... Also the stroke of the 240 is
almost an inch less than the 300. I don't have my book,
but seems like the 240 is maybe 3.18 ?? or so, vs the 3.98
of the 300. Many people like to stick 240 heads on 300's
to get more compression. I've got one of each.
I gotta 68 F-250 with a 300, and a 74 F-100 with a 240.
I can tell the difference between the two just by sound
and feel when driving... The 240 revs about 4k higher
than the 300. A bit less torque at low rpms...
The 300 has a fairly "truckish" feel to it, with the sound,
low rpms, long stroke,etc... The 240 almost feels like a "big car" six, it's so smooth from the shorter stroke.
In fact, the 240 was used in a few galaxies...
MK
Mountain Pass
Joined: Feb 2005
Posts: 203
Likes: 0
oohh, so you said you can use 240 heads on the 300? What about some of those really nice and expensive crossflow 240 heads then? We could get some serious power increases from them hehe.
Maybe im just stupid, thats why im going to college, TOMOROW laff
Maybe im just stupid, thats why im going to college, TOMOROW laff
Laughing Gas
Joined: Jun 2003
Posts: 1,218
Likes: 2
From: Parkville, MO (KC)
Jeff, what more do you want to know?
Yes, 240 heads bump up compression on a 300. I don't know if there were 240 cross flow heads.
Search and read here and over at fordsix.com
You will learn the answers. The folks that know all the answers get tired of answering again and again. Got to read a little on your own.....
Good luck.....
Yes, 240 heads bump up compression on a 300. I don't know if there were 240 cross flow heads.
Search and read here and over at fordsix.com
You will learn the answers. The folks that know all the answers get tired of answering again and again. Got to read a little on your own.....
Good luck.....
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