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A Ford 300ci I6?

5K views 41 replies 24 participants last post by  DeRanged mudder 
#1 · (Edited)
So I've heard a nice and interesting tidbit about a certain motor that Ford made back in the 70's. As far as details go, all that was discussed was that it was an I6 with roughly a 300ci displacement. Heard that for awhile it was used in the Mustangs of the era (I know, I just admitted to knowing about the Mustang II) and from the source that I got this from, in a few F250's from that time as well.

So really my question is, what exactly was it placed in, all specifics (hp and torque specifically), and if anyone has placed one of these in a TJ. That 2.5 that is in it has to go.
 
#7 ·
don't forget the 144 -250 and 240-300 came stock in mustangs.

IIRC it was used in f150-f350 and last used in 98 before the superdutys. You could get it later as an industrial engine.


why would you put it in your jeep? There is more aft mkt support for the Jeep six than the Ford six. The ford six is starting to catch up though and I would love to pick up an alum head for mine.

You can get all the details at fordsix.com/forum. just about the greatest place for any info on the motor.

edit: tq was usually a little higher than a 302. somewhere over the 200 mark
 
#12 ·
I used to have a fleet account where we would rebuild the 300's in bread trucks. These things can take some abuse!

I got one engine on the pallet that when I flipped it over it sounded like a drum full of broken glass. I pulled off the head and only about two 1 inch strips of cylinder wall were left on one cylinder. The rod was pretzeled and the piston was everywhere. I called the mechanic and told him to ask the driver what he did to this thing. He said it started knocking for about 50 miles then BAM! He kept his foot to the floor and clutched it until he made it back to the bakery another 10 miles and it finally died when he let his foot off the gas to turn into the driveway of the bakery. What a mess! Stay away from anything you might find in a bread truck -lol.

My 96 F150 has 265,000 on it and runs like new. If you can put a fuel injected one in it will last forever.
 
#20 ·
you dont know anything about mustang II's

the straight 6 was never offered in the 74-78 mustang or any pinto, it was not 300 CID either, rather 250. correct me here guys if i am wrong but the 300 didnt come out till the mid 80's

in 1974 the mustang II only came with 2 engine options, a 2.3 I4 and a 2.8 German designed v6 that later evolved to the 2.9 ranger bronco II engine and then turned into the 4.0 OHV engine.

people were outraged and demanded a V8, so in 1975 ford offered a very choked down and under powered 302 4.9L V8. i think it was rated at 150 HP.

yes I know a lot about mustang II's, this was my first car and i still have it this day, 24 years later!

i have also had 8 other of these cars, personal favorite was a 1978 T top factory V8 car, restored it for the X wife, cought her and my X best friend doing each other in his truck at the end of my street, needless to say i sold the car less then 3 months later.
 
#24 ·
Yes, it could. Peak numbers don't tell the whole story of an engine, and the 300 in my '81 E150 pulled just as stong as the 4.0 in my '02 Wrangler. The van was much heavier than the Wrangler.
 
#29 ·
I replaced one in my truck. First one blew up due to failed oil pump. The one I put in had 7500 miles on it. Should last for a while.
They are heavy. I think I remember they are around 500lbs bare.
The motor would pull the jeep around fine, but dont know if the jeep would like having something that heavy in it. They are tall too, compared to the 4.0. Especially if you go w/ a FI one.
 
#34 ·
I got an Offy C-series intake on mine and swapped to the EFI dual outlet manifolds found on EFI equipped 300s...
I also put on GM TBI and it runs real good..nice increase in power and it revs to 4800rpm
 
#39 ·
Yeah you have to have screw in studs but you can swap to an older style head I believe...Yes the higher ratio ones are actually chebbie

For my setup I'm still using the TFI coil, DSII distributor and a GM 7 pin ignition module..The ECM is controlling the timing and the knock sensor is installled in the fuel pump block off plate...It was a pretty simple swap and I don't have much money into it and I really like it..
 
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