i have a 1 ton 91 with a fuel injected 460 bottom end is crappy but heads and entire system is great but i have access to a stock 429 out of my uncles (ex sherrif's) car he used he had rebuilt bottom end but the heads (supposedly a cracked head) were crap so he parked it it has since rusted down but we fire motor up every few months no water in oil so i wonder if i took the two and combined them would they interchange if so i had a perfect sleeper idea ford ranger or courier with fuel injected 429 is it possible to put the efi on the older 429 and make it work is my question?

 

basically yes.

you can put the efi top end on the 429 bottom end and it will work, but there is a few things you will have to keep an eye on.

the deck height of the 429 is different between the early (70 and older) and the newer blocks (71 and up, or it might be 72) so the pushrods will more then likely have to be measured for correct lenght and odered from the aftermarket. stock pushrods more then likely will not work.

depending on year of 429, you should check valve to piston clearance to make sure there is no interference problems there. shouldn't be, but always safer then sorry in my opinion. if it is rebuilt, they might of changed the pistons to flat tops for more compression so be aware that you might have a high compression engine requiring premuium gas. you will have to do the math to determine the actual compression ratio with what you have.not sure of the actuall head volume on the fuelie heads, but i think it was around 88cc if not mistaken.

you will have to use the heads, intake, exhaust and distributor as a complete package from the fuelie engine on the 429, as these parts are not interchangeable.

also if it was a ex cop car, check the casting numbers on the heads. if they are D2OE (not D2VE which are garbage) they are the police interceptor heads and are quite rare and valuable even cracked (as long as they are not cracked in half) as they have bigger vavles and ports then the regular car heads, but not quite as radical as the cobra jet heads.

Rgds
Mike

 

around here back in the 70s and 80s the Sheriff could pretty much use any vehicle they wanted as their squad car and my uncle butch was sheriff he got a newer car it was a mid 70s mercury montego with just a stock 429 it wasnt a cj or scj just a stocker and these heads have a similar casting number to my 460s heads i know they arent doves i know that.... i know it was rebuilt stock no flat tops unfortunately

 

Also know that the 429 was internally balanced, so you will have to use the zero balance flexplate that came with it. (or go aftermarket)
Otherwise you will have bad vibration problems that will ruin the engine.

 

The 429 and 460 are identical in every way, except the crank.
460 crank in a 429 = 460 ci
429 crank in a 460 = 429 ci

 

As a running change during the 1979 model year the 460's were changed to external balance.
There were no 429's produced for passenger vehicles by this point.

429 cranks are stamped 4U, 4UA or 4UAB
460 cranks are stamped 2Y, 2YA, etc... , Later 460 cranks are 3Y 3YA.

A 3Y 460 crank will fit in a D-0 or D-1 block, but an internally balanced crank will not fit in the later D9 blocks that have longer cylinders without a lot of clearancing.

What I say about having the proper flywheel/flexplate for the engine is critical.

 

I wouldn't pitch that D9 block. People will pay money for them because they are better suited for building a stroker motor. Now a D1 I'd throw in the trash, you can't give them away to anyone but a scrap yard, at least in my area.