Cranking PSI 72 351C 2 bbl

[boilermaster]

Johnny57 if you have an air compressor, consider buying/ renting a cylinder leakdown tester. it will tell you the percent of leakage of each cylinder and you can also listen/feel where the air is escaping to determine if or where you may have an issue.
Like a compression test the results can be somewhat subjective.
Usually 8-12 % is considered good 15 -20% is considered ok for a production engine, thing is 10 different people are likely to interoperate in 10 different ways.

 

[Cleveland Crush]

If it's running good and no excessive oil consumption or smoke run it and enjoy the ride johnny57!!

 

[71ProjectJunk]

120 PSI at 5,500 feet is more than fine.

 

[machphil]

I was just looking for the factory "base" PSI. I built performance 2 stroke motorcycle engines as a profession for the last 22 years, so I know the parameters. But it seems some guys don't realize the base psi is very important. As many post "as long as they are with in 10% differential" or what ever you are good. That's not really valid as a single statement, as you have to know the base psi also. You may be within the 10% difference, but if you are down 40 psi from your base psi, your motor is sick. Which actually negates the 10% differential saying you are in a acceptable range.

The Ford manuals don't list factory baseline. I'm sure that is to eliminate future customer concerns.

 

[Johnny57]

The Ford manuals don't list factory baseline. I'm sure that is to eliminate future customer concerns.

Funny, That though popped into my head when I saw the acceptable range of compression psi.