400 or 351m????
Laughing Gas
Joined: Apr 2001
Posts: 868
Likes: 3
From: New Glasgow, Nova Scotia
I've had both in previous trucks, 351's are notoriuosly hard on mains and the 400 Valve guides seem to pass oil. Since you already have a big block why not go all the way to 429 or a 460, very few changes. The 460 mounts can be modified to fit 351m frame mounts and move the trans. mount back to the farthest hole and drop it in. About the same or in my case better fuel milage with tons of power and reliability. JMO, but I've been there also and the 460 was the way to go.
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