Fixed it for you...

391 4V: 1964/78 500 and larger series trucks, but usually not found in F500/600's.

359 and 389 are 361's and 391's detuned for smog.

 

Still wondering about the allure of the steel crank.

Back when I was in high school (more than 20 years ago) and figuring out how I wanted to rebuild the FE in my F100, I measured every part laying around the place and that included a 391 crankshaft. The forged steel crank out of a 391 weighs 71 lbs. while the cast crankshaft from a 352/360 or 390 weighs 56 lbs.

Machining costs not considered, I ended up with a nasty little 352 after that little experiment.

 

They're more durable for the prolonged stresses of Nascar, Lemans and other long distance races. In Trucks that's also needed for long stretches while the engine is producing maximum power The FE cranks while I've never had one to weigh, likely were somewhat lighter than the FT cranks first because the front snout is smaller in diameter and secondly because the counterweights would be lighter for the lighter pistons used in a race application. The truck pistons are some heavy sumbitches.

 

Actually it was the 330XD and it did have a forged steel crankshaft and heavy duty timing cover and water pump. The whole point behind it was U-Haul wanted a heavy duty indestructible engine for their F350 based chassis. Produced in '78 and '79 model years only.

 

No FT engines were installed after 1978. Replaced in 1979 with 370 & 429.

 

The thing is, only the 330 H/D is listed for 1973/78 in the parts catalog, the M/D was (supposedly) cancelled at the end of the 1972 model run.

But this is "a sheep in wolf's clothing," because it uses the 360 crank, so what the IDIOTS at FoMoCo did, they renamed the M/D the H/D!!!

The original 1964/72 330 H/D then went bye-bye. This has been a FIASCO ever since.

See 6303 in pic.

C8TZ-6303-A is the 1968/72 360 crank used in 1968/72 330 M/D .. D0TZ-6303-C originally was the 330 H/D crank installed in 1970/72 F600's w/a C6.

D3TZ-6303-B is also the 1973/76 360 crank. D3TZ-6303-C is also the 1973/76 390 crank. Confusing, ain't it!

 

Nope incorrect. Officially the FT ended as a production option at the end of the 1978 model year but the special U-haul fleet deals continued thru the 1979 model year. The pics I posted above are indeed of a 1979 model year 330XD. The owner has confirmed that the block was cast in early 1979. The parts books don't show actual history.

 

How does the owner know the block was cast in 1979, since the date code on the block could also decode to 1969?

 

Mirror 105 block with double dot 9 date code. It was cast 4 weeks prior to the trucks scheduled build date. Mirror 105 blocks did not come out until 1973.

 

That is determined by using the engineering number prefix. But if it's an FE/FT, it's not a 79 casting. Last year for them was 78 in the MD trucks.

 

You are correct the '78 model year was the last year that FTs were offered for retail sale in HD/MD trucks. But the U-Haul fleet order was a special deal not a normal production order. The story I heard was that U-Haul liked the 330XD engine so much in '78 that they convinced Ford to put it in their big fleet order in '79 as well. I don't know if that is the real story or not but the pics I posted above were from a long time FE big block forum group member. He has talked about his '79 330XD U-Haul F-350 many times over the years. I'll see if I can find the pic that he took of his warranty plate.

 

U-Haul F350's came with the 330 2V Medium Duty, and the parts catalog listing is 1973/77.

The 330XD is listed in the VIN engine codes for 1975/78 500 and larger series trucks, its code is D but there's no mention of it in the FT engine parts section, so it may have been a D.S.O. only.

 

The idea that any FE blocks are "high nickel" is very common internet myth. Ford did experiment with them, but they never went into production, at any time.

=

 

Yea, I can see that happening with U-haul trucks.

 

Wasn't just an internet thing. It got started in reference books long before Algore invented the net