When I previously tested my engine all of the cylinders were between 225-235psi. This time when I did the test the results were 80-90psi. I had all of the plugs out, injectors unhooked, and cranking 4-5 times. What could be the difference?
Phillip

 

Did you force the TB open?

 

Yeah, I propped the TB open with a wrench.
Phillip

 

I just tested another corvette and it read 75-80....maybe its the guage

 

Probably the gauge since it's reading similarly on another LS1