400 for $100
Thread Starter
|
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
400 for $100
I have a chance to buy a 400 with a C6 (I think that's what it is) for $100. I'm sure this is a good deal, but what can I expect for $100? They came out of a Bronco.
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
M-block crankshaft casting ID codes are located on either the first counterweight (opposite the first throw at the front of the engine), or on the side of the first throw. Casting ID codes are recessed into the unfinished (raw cast) surface. Sometimes the characters are faint, so you may have to thoroughly clean the area with a solvent to find the ID code.
The 351M cranks are marked 1K or 1KA.
The 400 cranks are marked 5M. 5MA, or 5MAB.
If you have to rebuild it, swapping a 400 crank and pistons into it is a very small additional cost over rebuilding it as a 351M.
The 351M cranks are marked 1K or 1KA.
The 400 cranks are marked 5M. 5MA, or 5MAB.
If you have to rebuild it, swapping a 400 crank and pistons into it is a very small additional cost over rebuilding it as a 351M.
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
Originally Posted by Fifty4F100
What would I be looking for to determine which is which? I heard a lot of people like the 351M better than the 400!
Postmaster
Joined: Aug 2001
Posts: 4,270
Likes: 5
From: Delaware
The 351C has a shorter deck height in the block (9.2" vs 10.3"). It has smaller main bearings and journals. It has the same bore and stroke as a 351M, being 3.5" Stroke and 4" Bore.
The bell housing bolt pattern mates a small block bell housing/tranny to a 351C, but you need a big block bell housing/tranny to mate to a 351M/400 motor, with exception of some rare 400 FMX blocks.
The bell housing bolt pattern mates a small block bell housing/tranny to a 351C, but you need a big block bell housing/tranny to mate to a 351M/400 motor, with exception of some rare 400 FMX blocks.
Trending Topics
Posting Guru
Joined: Jul 2006
Posts: 1,354
Likes: 1
From: America
id say mostly the c's were in the era of big solid cams, big carbs and high compression closed chamber heads...as well as the above stated.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Hotshot
Joined: Mar 2001
Posts: 13,559
Likes: 81
From: Manhattan, KS
You might check the vin on the bronco if it is available and that would at least tell you if it originally had a 400. It is unlikely someone replaced it with a 351m if it originally had a 400, although possible. What year is the Bronco?
Thread Starter
|
Laughing Gas
Joined: Feb 2003
Posts: 1,242
Likes: 2
From: Bartlett, TN
1.) It turns out it was a 351M.
2.) He sold it today before I could get up to see it!
Thanks for all the input. I've seen a 400 for sale a few times. Maybe now I'll be a little more aggresive.
2.) He sold it today before I could get up to see it!
Thanks for all the input. I've seen a 400 for sale a few times. Maybe now I'll be a little more aggresive.