engine swap trouble question? help appreciated!
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engine swap trouble question? help appreciated!
I have a 1984 F150 with a 351w HO. I spun all the bearings out of it & pulled it to rebuild, well in the meantime I ran across a 1985 F250 which I was told was an 302 engine. I heard it run and sounded good so I bought it to put in my 1984 while I'll take my time rebuilding the 351w HO. Well................ when putting it down in my truck i noticed the exaust y did not line up and on further looking my transmission will not hook up either, my transmission bellhousing is quite a bit smaller. I can find no numbers on the so called 302 to verify that it is a 302 only help i can give at moment is firing order which is 13726548. I,m thinking since the engine is bigger than my bellhousing it could be a 351M or 400, could that be it or is a 1985 302 differant? Not sure if I can get the tranny from the 1985, but if I can will it be OK to use? Drive shaft length, spline, etc. Anyone's help would be greatly appreciated! I know i'm going to have more questions when I verify or find out whats going on , so thanks in advance for your knowledge and help!
Kochy54
Kochy54
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From: Coutts Canada
First off do you have a 4sp or an auto? If you do the 302 uses a different flexplate and thus a different torque convertor. If you have a 4sp, some bellhousing use a smaller clutch and sometimes a smaller bellhousing is used and so the bigger clutch won't work cause it hits the bellhousing (i had this problem in my fllareside) Also if its a 351M/400 there should be a flat spot on the front of the head where the valve cover does cover, on the 302 (and your 351) this spot will be covered by the valve cover.
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It came out of an 1985 F250 2 wheel drive (my 1984 is 2 wheel drive to). But now im thinking it was not the original engine. Is there anyway for me to determine engine size by visually looking at it (valve cover bolt count, distributer location, etc.)
Thanks!
Kochy54
Thanks!
Kochy54
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A 302 will not fit where an M block fit...ever..... You'd have to change bellhousings if your trans allows for it, or change transmissions and possibly drive shafts to accomodate, along with possible trans mount and bushings and so on. I'd also bet the engine mounts, both rubber and metal stands need to be changed as well. It's a totally different engine.
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From: Coutts Canada
If it was a 302 then it should physically fit in place of your 351W, but that is definatly not a 302.
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From: Winnipeg, Manitoba
Originally Posted by mustange70
If it was a 302 then it should physically fit in place of your 351W, but that is definatly not a 302.
302's can be different from a 351 w....depends on year, trans, etc. Fords are not a straight thru transfer from one engine to another like the chevy's were. To many year options/variables with transmissions/performance options etc.....I love my Fords, but they're not all inter-changeable
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From: Coutts Canada
Yeah i know, its the little things that do it, like the flex plates/clutches and bellhousings, and oil plans. 302's and 351's of these years of truck will physically fit in place of each other (providing they came from another truck of the same erea) but weather they will bolt up is a whole nurther story.
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Well.............. the motor fits OK, I have it sitting in the truck now, motor mounts line up perfect. Only thing I notice so far is the transmission will not line up (it's to small by about an inch all around bell housing) and the exhaust y pipe is also to small. Reason I got it everything i've read says a 1985 should be either a 302, 351w or big block and everyone I talked to told me the 302 or 351w from the 1985 should bolt right up to my 1984 351w HO with no problems. I'm starting to think the 1985 is not the original engine and had been changed? If it is a 351m whats you guys opinion of it? You think I should go ahead and get a transmission and whatever else (y pipe, drive shaft, etc.) and go with it or just forget it and rebuild my 351w HO? My 351W HO was always giving me problems, the 4 barrel carb was a gas hog and always giving me problems and the engine itself seems tired, reason I pulled it lost oil pressure and started knocking bearings rod and main are gone and everyone tells me should replace crank or i'm wasting my time just putting bearings in it and putting back in. This is my only ride so really need some good advice, and my budget is not to good at this time!
Many Thanks!
Kochy54
Many Thanks!
Kochy54
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From: Winnipeg, Manitoba
Rebuilding can be expensive in regards to machine work required(boring, honing, and machining the crank, may want to get your valve guides checked as well), but can be worth-while in regards to being cheaper than completing the swap you're attempting to do here. If the crank isn't to bad, a good machine shop can undersize it slightly, and you can run an over-sized set of bearings to accomodate. Be sure to get your rod bushings checked, cam bearings are a must as well, and often over-looked. If you were to dis-mantle and re-assemble the engine yourself, the machine work would likely be with-in a reasonable dollar bracket. The one advantage to having an engine re-builder do it all is the warranty factor. Up to you on that issue.
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From: juniata county
As long as the motor a small block it will bolt up the the trans . 300 6 cyl , 289 ,302 , 351 w , all the same bolt pattern on a small block trans .
Auto or Manual trans no different as long as it came off one of those motor.
As far as year don't really matter for bolting together but like i said has to be from one of those motors .
( P.S my project i'm try to make a 1990 bronco full size maza style trans 5 speed ,work on a 1969 351w block .
the problem i am haveing is makeing the cluch work . )
Auto or Manual trans no different as long as it came off one of those motor.
As far as year don't really matter for bolting together but like i said has to be from one of those motors .
( P.S my project i'm try to make a 1990 bronco full size maza style trans 5 speed ,work on a 1969 351w block .
the problem i am haveing is makeing the cluch work . )
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If you are willing to consider a reman. engine there is a thread about them in the preformance engine forum titled the Good the bad and the ugly.
Oh Ford Snow Braker, get a complete pedal and clutch linkage and bellhousing from an early 80's bronco and you should be good to go after swapping parts.
Oh Ford Snow Braker, get a complete pedal and clutch linkage and bellhousing from an early 80's bronco and you should be good to go after swapping parts.
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Well...... Looks like I got a 351M, it's not going to work with my 351W. Does anyone know if I get the tranny off the M engine and use it will it hook up to my driveshaft OK ( spline size and lentgh wise?). My truck has a one piece shaft the donor truck has a two piece, any differance there?
Many Thanks!
Kochy54
Many Thanks!
Kochy54
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From: Winnipeg, Manitoba
Is the donor truck a 4x4? Two peice shafts are common in them, and singles common on 2WD rigs.....the trans from a 4x4 will not fit due to the different tailshaft. You'll need a trans from a 4x2 to suit your needs.
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