300 to 351M
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From: Lewistown, PA
300 to 351M
hi, my 77 F150 4x4 has a 300 inliner. this engine came with no emissions save for the PCV. I know this because the decal on the valve cover reads non-catalyst. my question is if i decide to swap in a 351M will i need to put emisson devices on as well,even though the truck never had any? Also my current bellhousing will not work correct? It has a NP435 tranny. I've heard that the 302/351W will mount up, but i not interest in those engines. I used to own a 78 F150 4x4 w/ the 351M and i loved the power this engine had,though there's always room for more power. any help would be profoundly appreciated. 
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Joined: Nov 2000
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From: Albuquerque
I would think the engine would be OK since it was offered by the factory. The bell housing is the wrong one I think. I'd go up to the 400 if I was going to do it. The weight of the vehicle determined it was "excempt" not the engine.
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Joined: Dec 2000
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From: Somerset, Pa
I would go to a 351 windsor if I were you.
I have a 79 with a 351m in it (low mile great running engine) it is in front of a c6 and is bone stock
I also swaped a 351w into my 76 and it will run circles around the 351m in my 79 and parts are easy/cheap to buy for it. Granted, it does have a cam in it but this truck is a 4x4 which adds a considerable amount of weight.
I have a 79 with a 351m in it (low mile great running engine) it is in front of a c6 and is bone stock
I also swaped a 351w into my 76 and it will run circles around the 351m in my 79 and parts are easy/cheap to buy for it. Granted, it does have a cam in it but this truck is a 4x4 which adds a considerable amount of weight.
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Joined: Apr 2004
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From: Lewistown, PA
thank you everyone for your replies. I just learned today a friend of mine may be buying a 75 ford F350. It has a 390 V8/4 speed that runs. He is only interest in the dump bed on it. any thoughts on the 390? I would have all of the parts necessary for the conversion from the donor truck. I would have to use the donor tranny as well, correct?
I don't know it it's a 4x4, does it matter?
I don't know it it's a 4x4, does it matter?
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Joined: Dec 2000
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From: Somerset, Pa
All you should need to do to put in the 390 is to use the 390 bell and move your motor mount perches over to the next set of bolt holes in your frame.
there may be some small things to address but nothing major.
there may be some small things to address but nothing major.
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Joined: Jan 2003
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From: North Carolina
Originally Posted by 77300i6
I used to own a 78 F150 4x4 w/ the 351M and i loved the power this engine had,though there's always room for more power.
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birddog25
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
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Apr 17, 2003 03:23 PM
