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1993 F250 351W
Alrighty so I was looking and found a much older 351W available in my area for cheap. Problem being its a 1972 351W. Now here is what I was wondering (where dangerous and stupid thoughts lie), is it possible, and how easy would it be? Would the lower throttle plate from my 93 351w bolt on? Is the bolts for the bellhousing the same? I do believe that there would be some issues with sensors (if im wrong please correct me). How well would a 93 ecu react to a 72 block? I have so many questions I hope you guys can answer for me. Or should I just give up this fantasy now?
Mostly just depends on the camshaft. I believe the intake manifold will bolt on, there should be all the same places to screw your sensors for your EEC sensors in an earlier block.
If it's a non-smog '72, it really just depends on what it came out of. Chances are, it's probably got the good C9 or D0-D2 heads on it (they're all functionally the same through D4 on a 351W) which was probably the best Factory head that Ford ever put on a 351W. But I've no idea if a '72 would have the dished pistons in it, bringing the compression ratio down or not.
What would a higher or lower compression ratio entail? I understand either more power or less power. But could the computer compensate for lets say a 11:1 compression ratio compared to 1993 8.8:1?
Yes. Mostly, everything will swap over. A few things to look out for.
NO smog injection port on the 73 heads, like the 93. The 73 will probably have a smog port on each cylinder, while the 93 will be 1 port on on the back of each head.The 73 won't have the EGR port casted into the heads for the intake manifold.
If your 93 is a roller cam shaft engine, you'll need to change the distributor gear to be comparable with the 73's non roller camshaft.
Rear main seal on the 73 will be a 2 piece rope-style seal. The 93 will be a 1 piece rubber garlock seal.
Compressions are probably different, but shouldn't be too far off.
Valve seats in the 73 may not be hardened since it was designed to run on leaded gas.
cast iron water pump on the 73 vs the aluminum on the 93.
Update: well I wasnt able to get it. However I did purchase a 1984 reman 351w. I need a engine, and any with a hydraulic roller was 4k and a 6 month waiting period. I believe that it being a 1984 it will be quite weaker (although I wonder about that given that it wont be choked out by a 2 barrel carb and instead run on efi). Will it be weaker, or will the efi make up for it? What do you guys think?
However I did purchase a 1984 reman 351w….Will it be weaker, or will the efi make up for it? What do you guys think?
Is the block from ‘84 or did you order an engine for an ‘84 vehicle? A ‘93 would not have been a roller cam so you weren’t able to order a reman engine for your truck?
Did you get a buy a machined bare block, a short block or a long block? If you bought an assembled block the camshaft might not have the right specs to be compatible with EFI.
I was originally looking for a hydraulic roller cam however after seeing the waiting times I gave up, I called several machine shops, none of them in my area rebuilt engines anymore. Finally gave up and actually placed a order twice for a flat tappet cam reman for 93, one at advanced and the other at autozone. Both got declined 2 days later by manufacturer due to them not knowing when they will be getting them back in. Went to autozone in person and found that engine model VF15 was in stock. Originally was going for a DFA1 but was unavailable once they called atk. So I went with VF15 at autozone.
A quick search on atks site shows it will be a d80e block with d8 or d9 heads.
So low compression, probably iffy quench rebuilder pistons. It will work, just dont expect to set the pavement on fire with acceleration. Cam will probably be okay with the efi but who knows what they are actually using for a cam.
That chart says it comes a timing cover. It will not work on your ‘93 because it will be for a standard rotation water pump and have the hole for the fuel pump so it will have to changed.
