I have 2 big block ford motors in my garage, they have 2 different sized holes in the back of the crank. I found this out the hard way today by breaking a $1000 tranny. The motor I am putting in my truck came out of a 75 f250. The block numbers are: D1VE-6015-A2B, with D3VE-A2A heads. I am not sure what size this motor is? It has the smaller hole in the back of the crank where the converter stub does in. The other motor is a 71 429. The numbers on it are: D1VE-6015-A, with D0VE-C heads. This motor has the larger hole in the back of the crank where the converter stub goes in. The guy I bought the 75 F-250 from is the origional owner and he told me it was a rebuilt 460, but I know this isnt the motor that came with the truck when it was new. So I need someone to shine some light on as to what I have here. If a 429 and a 460 use the same crank, why do these 2 have different holes in them for the converter stub?

 

they dont use the same crank... the difference between a 429 and a 460 is the crank and pistons... everything else interchanges

 

The cranks are different. The 460 was an option for the 75 f-250 so it could have been the original engine.

 

1973/79 F100/350 ~ 460's were optional ~ 4th digit in the VIN is the engine size ~ Either an A or J is a 460.

btw: It's D1VE not 1VE

D1VE-6015-AB = 460

 

I know there are two different torque converter hub sizes. But I don't remember what they are or what years they changed.

 

actually he had it typed right but put a colon in front of the D and the board reads that as a smillie face.

I went ahead and added the space so it wouldn't do that.

Yes 2 different pilot holes in teh cranks, most of the 385 series engines used the 1.375" but some of the early 429s had the same 1.850 crank pilot like the FE engines. You can bush the bigger ones down but you need the small pilot on the TC for these engines as a general rule.
I may be wrong (has happened before) but I don't believe any of the 460 cranks had the bigger FE sized pilot.

 

Is it possible for a 75 model year truck to have a 71 model year block? The origional owner said he had the motor overhauled, is maybe possible the shop replaced the 75 460 with a 71 429 or 460 with 73 heads. I am still not sure what it is, all I do know is it was bored out and has a lot of *****!!! I was hoping by putting up the casting numbers someone could tell me what size of motor it is, a 429 or a 460.

 

the casting numbers on ford parts is only a representation of when teh design or design change was made, the actual year and day it was cast is a code of numbers and letters, should be located somewhere close to the casting number on teh block and inside the valve covers on top of one of the intake runners on hte head i believe, its been quite a while since i've dealt with 429's and 460's so correct me if i'm wrong

 

theres no way to tell the difference between a 429 and 460 externally, the only way is to actually measure the stroke, or pull the oil pan and look at the counterweights on the crank- one of them has a stamp on it... if it has a 4 in it its a 429, if its a 2 its a 460, and if its a 3 its a later external balance 460. also with the casting numbers- yes the 1975 engine would have the d1ve block and d3ve heads... they used d3ve heads until 1986-87, and d1ve blocks until 1979.

 

O.K. thats what I needed to know. The p.o. story is true then this is the origional 460 that has been punched out to a 486. The info provided by everyone is greatly appreciated. Thanx.

 

the block wouldnt be able to take an overbore to 486- it would be a 466- .030 overbore

 

77f150xlt429cid,

460 crankshafts came with both pilot sizes. The ealier 460 cranks have the larger pilot and the later 460 cranks have the smaller pilot. 460 crankshaft ID markings are on the edge of the third counterwight from the snout, and the internal balance crankshaft casting numbers are: 2Y, or 2YA, of 2YAB, or 2YABC.

The 2Y and 2YA cranks have the larger pilot, while the 2YAB & 2YABC cranks have the smaller pilot.

I never bothered to look, so I am not sure if there was a smaller pilot with the later 429 crankshafts, but I would certainly bet on it.

D1VE blocks were used in production 460 engines from 1971 model vehicles through 1978 model vehicles, so it is certainly possible (actually it's normal and expected) for a 1975 460 to have a D1VE engine block. The actual date code of the cylinder block casting is in the lifter valley and is alphanumeric.

Paul

 

Paul don't you have one of the later steel 429 cranks around? I was thinking you had one, maybe measure it and see what the pilot is on them as that might be good info to have.