Jump to content

Recommended Posts

Hey guys, I'm restoring a 1973 Mustang with a 351M engine in it. I'm have all the parts to do an Edelbrock performance upgrade to it. But I'm stuck trying to find the right headers for it. What do you guys recommend? 

Link to post
Share on other sites

Is it an "M" code 351 (Cleveland) engine, or an actual 351M? Two different engines, but very similar. If it is a 351M do you know how it got in the car?

A 351C "M" code came with 4V heads and requires 4V headers.

  • Like 1

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

Link to post
Share on other sites

It came from factory that way. I was told that when I bought it and  I looked it up through the VIN. Its a 351M 2 valve engine. When I read about it, it says it's a tall deck - I'm concerned with clearances if I use a standard 351C header. 

Link to post
Share on other sites

Step one, make sure you know what you have, note the "wall" on the 351M block. If it's not there, you have a 351C

 

 

351c_vs_351m.jpg

 

 

Link to post
Share on other sites

2V and 4V on older engines does not refer to the number of valves in each cylinder, but the number of venturies (barrels) in the carburetor. 

The 5th character in your car's VIN (vehicle identification number) will tell you what engine came in your car. 

Edited by Don C

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

Link to post
Share on other sites

This article should help you to understand the differences in the engines

https://en.wikipedia.org/wiki/Ford_335_engine

The spreadsheet in this thread should help you with the VIN numbering, as well as with other Ford codes and numbering systems.

https://7173mustangs.com/forums/topic/33536-ford-code-numbers/?tab=comments#comment-344745

 

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

Link to post
Share on other sites
7 hours ago, Hemikiller said:

Step one, make sure you know what you have, note the "wall" on the 351M block. If it's not there, you have a 351C

 

 

351c_vs_351m.jpg

Thanks for the PIC, it's helpful! Looks like I have the "wall" you circled on your picture up by the distributor making it a 351M engine. 

 428751000_ViewalbumMustangMach1.thumb.jpeg.e8c316eff829b72a75f1be3546b7b553.jpeg

Link to post
Share on other sites

Yep, that's a 351M or a 400 block. Most 351C headers for the 71-73s will not fit due to the extra deck height & resulting width increase

Another member @MeanMachine used Patriot shorty headers on his 400 equipped car. 

 

https://www.summitracing.com/parts/pte-h8435-b?seid=srese1&gclid=Cj0KCQjwyJn5BRDrARIsADZ9ykEGltBT0KuNQfkQoo69FHvIb1_VpTP1shrbZehEjWkdUVhpN1zT-rUaAtoNEALw_wcB

 

 

 

 

Link to post
Share on other sites

Interesting, definitely not from the factory that way. Now, the 64 thousand dollar question, is it a 351M or a 400? If it has a casting number from '71, '73, or '74 (begins with D1, D3, or D4) it is likely a 400. A casting number for '75, '77 or '78 (D5, D7, or D8) means it could be either one.  And, then if it's a 400, big block or small block bellhousing?

 

 

“If you can't explain it simply, you don't understand it well enough.”

--Albert Einstein

 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    No registered users viewing this page.

About Us

7173Mustangs.com is a community forum designed especially for fans and owners of the 1971, 1972 and 1973 Ford Mustang! We are not affiliated with Ford Motor Company in any way.

Site Navigation

Forums
Gallery
7173 Wiki
Blogs
Clubs

7173logo_small.png

Site Info

Founded:
July 2010

By:
Webfinity Design

From:
Latrobe, PA

×
×
  • Create New...