351m/ 400 in 71' mustang - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 04-04-2007, 13:51   #1 (permalink)
Registered User
 
Join Date: Apr 2007
Posts: 2
confused 351m/ 400 in 71' mustang

hi
2 months ago i purchased 71' mustang as a project car, oryginaly car came with 351c 2bbl, last owner changed it to 400 and fmx trans. (i think its not c4 and its not c6) engine is not installed in the car yet its just sitting in the engine bay . i got the engine mounts for 351c.
did someone swap 400 into 71 mustang do i have to change something or its just bolt on, i got also long tube headers for 351m/400 not sure yet if they will fit without modification. i have also 351m i was going to swap into my 68 mustang but decided to leave it # matching car, i can always put 351m into '71 if 400 wont fit
any advice?
lukasz is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-04-2007, 14:40   #2 (permalink)
Registered User
 
Join Date: Dec 2006
Posts: 172
Re: 351m/ 400 in 71' mustang

last sentence 351M & 400 are the same engine. The '71s had the 429 in them,so a 351M/400 will fit.
George1861 is offline   Reply With Quote
Old 04-07-2007, 16:05   #3 (permalink)
Pommey Mustanger
 
mach1mike's Avatar
 
Join Date: Apr 2004
Location: Cornwall UK
Posts: 139
Re: 351m/ 400 in 71' mustang

Won't be a problem, my mates got a 400 in his 72 'Vert
__________________
mach1mike is offline   Reply With Quote
Old 04-14-2007, 17:15   #4 (permalink)
Registered User
 
Join Date: Mar 2007
Location: St Louis, Mo
Posts: 250
Re: 351m/ 400 in 71' mustang

Quote:
Originally Posted by George1861
last sentence 351M & 400 are the same engine. The '71s had the 429 in them,so a 351M/400 will fit.
Meaning they are built on the same block but have different internal parts. The transmission is an FMX if it has a cast iron body. They are very good transmissions.
__________________
I love it when people do things right
Unfortunetly I dont always do that lol
Sand1 is offline   Reply With Quote
Old 04-14-2007, 17:28   #5 (permalink)
Registered User
 
Join Date: Dec 2006
Posts: 172
Re: 351m/ 400 in 71' mustang

Quote:
Originally Posted by Sand1
Meaning they are built on the same block but have different internal parts. The transmission is an FMX if it has a cast iron body. They are very good transmissions.
The crank & rods are the only difference between the M & the 400. Exept for some built in '73, the M/400 have the 429/460 bell pattern.
George1861 is offline   Reply With Quote
Old 04-14-2007, 18:15   #6 (permalink)
Registered User
 
Join Date: Mar 2007
Location: St Louis, Mo
Posts: 250
Re: 351m/ 400 in 71' mustang

Just checking, you are probably aware of the number of folks out there (even Ford folks) who dont believe there is such a thing as a 400 cid M block. I had the 400 out of my truck sitting on the floor. I was pointing out the decal that said 400 cid and a guy was still arguing that it was a 351. He kept pointing to the engine class, 351M/400. I finally had to kill him and bury him under the shop floor lol JK.
__________________
I love it when people do things right
Unfortunetly I dont always do that lol
Sand1 is offline   Reply With Quote
Old 04-21-2007, 08:35   #7 (permalink)
Registered User
 
Join Date: Dec 2006
Posts: 14
Re: 351m/ 400 in 71' mustang

Quote:
Originally Posted by George1861
The crank & rods are the only difference between the M & the 400. Except for some built in '73, the M/400 have the 429/460 bell pattern.

The rods are the same between the 351m and the 400 ,the Pistons and crank are the difference.
Also the motor was built as the 400 but the stroke ,was changed to the 351,hence 351 Modified, from a 400, because the demand for the 351 cube engine was higher because of the dropped 351 cleveland motor.the Windsor plant couldn't keep up .The 351m crank is a 351windsor crank with different snout.
bryanscott is offline   Reply With Quote
Old 05-03-2007, 18:12   #8 (permalink)
Registered User
 
Join Date: Apr 2007
Posts: 2
Re: 351m/ 400 in 71' mustang

next problem
first had some problems with engine mounts but welder came in handy...
i ordered full-length hedman headers(#HED-88220 ) from summit racing, passenger side fits fine but the problem is with driver side cant get clearance because of steering box ( car is with power steering) (headers should fit with power steering acording to summit racing) maybe diferent steering box that i can use or different headers, has anyone had this problem or know how to work around it? ( i can take pic if thats gonna help) really dont want to go with stock headers.

any advice
lukasz is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 15:21.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.