You should be able to take the cap off and see the flow at fast idle. If you have a thermostat installed, I would try removing it to see if that helps. The thermostat does cause a restriction.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!