1973 Mustang – Project SportsRoof – Vacuum System Part I

Most car enthusiasts know that by the 1970’s all cars even ‘former’ muscle cars, were strangled in terms of power by a host of tubes, solenoids and funny looking flat or funnel like space age devices that were responsible for eliminating harmful emissions.  In some cases they funneled fumes back in to the engine to be burned and supposedly rendering them less harmful.

When you are restoring a car of this vintage – especially one like my 1973 Mustang that has been sitting around a while, those tubes/hoses are often cracked, dried, split or ends stretched at the least for missing all together.

You have the option to remove all the space ag hardware (depending on the emissions regulations in your area) or replacing it all to restore to factory specifications.  For the purpose of these series of posts let’s assume that I want to seriously limit the performance and power of #ProjectSportsRoof’s beautiful 351C and restore it back to factory configuration.

Now if you are expecting an expert run down on the care and feeding of the vacuum system for this project – you aren’t going to get that right up front.  Why?  Because it’s really not that straight forward at first and I have a few questions.

As I look at the diagrams for the vacuum system on a 1972 351C, I am not seeing anything that matches my set up.

Let me start back of the engine.

There is a solenoid on the back of the manifold (only bolted there) that I think is some diagrams is shown on the opposite side and in the front.

Here’s a better shot.

As you can see it has no power connected nor hoses. Is that the Solenoid Dist vacuum?  I think so.

For the 1972 351C. The solenoid is #12 in the diagram –

Source:  www.mustangbarn.com

As you can see it’s in the front.

So the vacuum hose travels back up front to the Valve Ass. Distributor vacuum control?

That’s the first set of questions, the front of engine is coming up next.

Tim