[347sn95]

I want to do a compression test on my car, but don't know what psi range i should be in. Motor has about 4k on it since rebuild. Does anyone know what the reading was when the was new?

[spdjnky_42]

I dont remember the # but they should all be very close. That right there will tell you what you need to know

[EagleAutosports]

The pressure can vary from engine to engine after it's rebuilt, but there is a minimum for it to be considered in good condition. That pressure is 130 psi, and hopefully all 8 cylinders will be somewhat close in their output.

[toyman]

Originally Posted by EagleAutosports

The pressure can vary from engine to engine after it's rebuilt, but there is a minimum for it to be considered in good condition. That pressure is 130 psi, and hopefully all 8 cylinders will be somewhat close in their output.

I would put the 130 psi as a minimum. You should be looking at 150+ psi with all within 5 psi on a recent rebuild.