300 to 351M?
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Junior User
Joined: Feb 2004
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300 to 351M?
I have a 85 F-350 w/ NP435. My carb'd 300 is toast and I am looking for a swap. I can't seem to find a 351W but found a 351M.
1) how do the 351M & 351W compare?
2) can I still use my NP435 (or whats a good replacement)?
3) I put a 3-core radiator when I rebuilt the 300 a few years ago - will I still need to swap that?
4) What ALL will I need to swap to make this work?
Thanks!
1) how do the 351M & 351W compare?
2) can I still use my NP435 (or whats a good replacement)?
3) I put a 3-core radiator when I rebuilt the 300 a few years ago - will I still need to swap that?
4) What ALL will I need to swap to make this work?
Thanks!
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Joined: Feb 2006
Posts: 67
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Originally Posted by navyflyinggreg
I have a 85 F-350 w/ NP435. My carb'd 300 is toast and I am looking for a swap. I can't seem to find a 351W but found a 351M.
1) how do the 351M & 351W compare?
2) can I still use my NP435 (or whats a good replacement)?
3) I put a 3-core radiator when I rebuilt the 300 a few years ago - will I still need to swap that?
4) What ALL will I need to swap to make this work?
Thanks!
1) how do the 351M & 351W compare?
2) can I still use my NP435 (or whats a good replacement)?
3) I put a 3-core radiator when I rebuilt the 300 a few years ago - will I still need to swap that?
4) What ALL will I need to swap to make this work?
Thanks!
Postmaster
Joined: Sep 2004
Posts: 3,166
Likes: 2
From: wi
need bellhousing to fit engine/trans flywheel for said engine mounts and frame stands.me personaly would never put am m into nothing but the scrap pile m = mistake but to each there own i gess. navyflyinggreg your 300 bellhousing will work and your flywheel will bolt up DO NOT use the fly wheel its balenced different than a v-8 and will vibrate your crank bad enuff to wipeout a new crank. i spose you could have everything balenced together at a good rebuilder tho
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Joined: Feb 2006
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So to use the 351W all we need is the 351w flywheel and motor mounts.
Sounds good to me.
Navyflyinggreg update us on the install so we can copy you, lol.
Good luck, i have to wait till my truck doesn't need smogging and i'm getting the good ole 300 out!
Sounds good to me.
Navyflyinggreg update us on the install so we can copy you, lol.
Good luck, i have to wait till my truck doesn't need smogging and i'm getting the good ole 300 out!
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Sorry guys...I found a Windsor last weekend 
so there won't be any 351M experiments for now. I am glad too...heard too much against using the modified.
The only question I have about the 351M, because of the larger deck height, does it produce more torque compared to the 351W?
so there won't be any 351M experiments for now. I am glad too...heard too much against using the modified.The only question I have about the 351M, because of the larger deck height, does it produce more torque compared to the 351W?
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Junior User
Joined: Feb 2006
Posts: 67
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Originally Posted by navyflyinggreg
Sorry guys...I found a Windsor last weekend so there won't be any 351M experiments for now. I am glad too...heard too much against using the modified.
The only question I have about the 351M, because of the larger deck height, does it produce more torque compared to the 351W?
so there won't be any 351M experiments for now. I am glad too...heard too much against using the modified.The only question I have about the 351M, because of the larger deck height, does it produce more torque compared to the 351W?
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Post Fiend
Joined: Jan 2003
Posts: 10,323
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From: Montana Territory
The real potential in the 351M is finding a 400 crank and pistons... HP/TQ are about the same for the 351M/351W, the heads on the M are way better than factory W heads, you can use the M heads on the Windsor block though and you will have a much better motor. The stock M heads flow better than performance GT-40 heads do for the 302/351W.