351M to 351W conversion... help needed
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Freshman User
Joined: May 2002
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From: Montreal Canada
351M to 351W conversion... help needed
Hi everyone!
I'm currently looking for a mid 70's F100/F150 truck. I did see a 1977 F150 2WD that I could get but it has the usual 351M. I'm buying a 351W next weekend and it's going to be all fixed up nice
My question is can I put in a 351W into this truck? I was told that the 351M would most likely have a C6 tranny. If that's the case I'd put in a C4 (which I can get for pretty cheap also). How well would the 351M + C6 to 351W + C4 swap go? I hear that it all should just bolt in with no problems.
Or should I just continue my search and find a truck with a 302 or I6 which in this case the 351W should just bolt in.
Thanks!
Steve
I'm currently looking for a mid 70's F100/F150 truck. I did see a 1977 F150 2WD that I could get but it has the usual 351M. I'm buying a 351W next weekend and it's going to be all fixed up nice
My question is can I put in a 351W into this truck? I was told that the 351M would most likely have a C6 tranny. If that's the case I'd put in a C4 (which I can get for pretty cheap also). How well would the 351M + C6 to 351W + C4 swap go? I hear that it all should just bolt in with no problems.
Or should I just continue my search and find a truck with a 302 or I6 which in this case the 351W should just bolt in.
Thanks!
Steve
Senior User
Joined: Aug 2001
Posts: 250
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351M to 351W conversion... help needed
You'll be better off finding a donor truck or car with a 351w to pull all the brackets and stuff. There may be some wiring issues to deal with also. You'll need cross members and motor mounts also.
FTE Chapter Leader
Joined: Sep 2000
Posts: 3,863
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From: Beachville, Ontario
351M to 351W conversion... help needed
The conversion is straightforward if you have a complete 351W with accessory brackets and transmission. This swap is easiest in a 302 truck like mine. Same motor mounts, same wiring harness, just different exhaust. Make sure to get front sump pan for the 351W. I had a 351M in my truck between the 302 and the 351W, if you have a complete donor vehicle it's just plug & play.
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351M to 351W conversion... help needed
You're on it right now.
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351M to 351W conversion... help needed
Been there, done that. It is easiest to have all accessories on the engine and have a tranny attached. You WILL have to use a tranny with the small block bolt pattern. I had a van as a donor and had to use different motor mounts for a 302 and different exhaust. The wiring was a direct plug-in(the van was a '77 also). Despite people telling me the van's center-sump oil pan wouldn't work, I measured carefully several times in several places and dropped it in with about 1-1/2" clearance between it and crossmember. Did it over a weekend and cranked it right up.
Good luck.
Kenny
Good luck.
Kenny
