Jump to content
  • 0

year change modifications. I have a 1972 mustang mach 1, 351 "Q" code.


Question

 It was built in November 1971 as per Marti report.  When did the actual new changes as per 1972 models begin.  I have noticed some things that apparently are  carry over from 1971.   Such as the changes in horsepower ratings?

Link to post
Share on other sites

4 answers to this question

Recommended Posts

  • 0

Model year changeover occurred in July 1971. a November car should be fully 1972 spec unless there were some mid-year changes.

HP ratings and engine specs would occur from Job 1 in order to be EPA compliant. 

 

 

Link to post
Share on other sites
  • 0

There's no clear cut answer as to when brake horsepower (gross) changed to SAE net horsepower ratings. California required all cars beginning with the 1972 model to use SAE net. Car manufactures complied for cars sold in California and during the 1972 model year all switched over to SAE net, not all necessarily at the same time. It behooved them to make the change as soon as possible due to the new EPA requirements, that way they could blame most of the apparent horsepower reduction on the new rating system and not so much on the actual power reduction of the engines. Hopefully someone has more knowledge as to when Ford made the change, and if all car lines and/or engines were changed at the same time.

 

 

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

--Albert Einstein

 

Link to post
Share on other sites
  • 0

There were very few cosmetic changes. The majority of the changes involved safety and emissions related items, most of which would become effective on 1/1/72. A couple of safety-related items was the passenger side mounted seat belt light that actually went into production on 12/1/71 on the Mustang line. The Mach1 pop open fuel cap, which was prone to leakage from rear-end collisions or rollovers, was replaced with the twist on the standard fuel cap, although some early production '72s still had the pop open cap.

There was also a difference in how horsepower was now measured. The previous method was Brake horsepower which was measured at the flywheel with no water pump, alternator, PS pump, etc. The new SAE measured power at the flywheel with all the normal power-robbing accessories in place.     

For 1972, Ford had cut compression drastically and cam timing retarded 4 degrees on the majority of all gas engines in the entire car a light truck line. With the looming gas crisis/oil embargo on the horizon, Ford knew that the ability for all these engines to be able to run on the cheaper regular fuel would be a great selling point.   

Steve

 

No Officer...I really don't know how fast I was going, my speedometer stopped at 140!

Link to post
Share on other sites
  • 0
On 11/18/2020 at 2:28 AM, secluff said:

The Mach1 pop open fuel cap, which was prone to leakage from rear-end collisions or rollovers, was replaced with the twist on the standard fuel cap, although some early production '72s still had the pop open cap.

While I can't prove it now as I have no pics of the door data stickers, both my 72 Mach's were dated 4/72. Why I remember that is because they were both made in the same month and I had both these cars at the same time. The red one was a Q code (that I should never have sold) and the pewter one was an H code. Both had pop-open gas caps. 

Oh! and if someone comments on the pewter one having 73 stripes, yes it did, I was given a set for free so why not.

057_057_01.JPG

071_071_01.JPG

Geoff.

 I learn something new every day!

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
Answer this question...

×   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.

×
×
  • Create New...